feat(stdlib): new modules + eslint/tsconfig migration
- Add array/async/etc. modules and type tests; migrate to eslint flat config and composite tsconfig (vitest typecheck enabled). - Fix PubSub.emit to snapshot listeners before iterating (stable EventEmitter semantics; avoids invoking listeners added during the same emit).
This commit is contained in:
@@ -1,4 +1,4 @@
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import { describe, it, expect } from 'vitest';
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import { describe, expect, it } from 'vitest';
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import { cluster } from '.';
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describe('cluster', () => {
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@@ -37,4 +37,13 @@ describe('cluster', () => {
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expect(result).toEqual([]);
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});
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it('not mutate the input and produce copied sub-arrays', () => {
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const input = [1, 2, 3, 4];
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const result = cluster(input, 2);
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result[0]!.push(99);
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expect(input).toEqual([1, 2, 3, 4]);
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});
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});
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@@ -1,4 +1,4 @@
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import { describe, it, expect } from 'vitest';
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import { describe, expect, it } from 'vitest';
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import { first } from '.';
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describe('first', () => {
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@@ -20,4 +20,11 @@ describe('first', () => {
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expect(first([1, 2, 3], 42)).toBe(1);
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expect(first(['a', 'b', 'c'], 'default')).toBe('a');
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});
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it('preserve a present null/undefined/falsy first element (not the default)', () => {
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expect(first([null as number | null], 42)).toBeNull();
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expect(first([undefined, 2], 42)).toBeUndefined();
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expect(first([0], 99)).toBe(0);
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expect(first([''], 'x')).toBe('');
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});
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});
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@@ -16,5 +16,6 @@
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* @since 0.0.3
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*/
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export function first<Value>(arr: Value[], defaultValue?: Value) {
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return arr[0] ?? defaultValue;
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// Branch on length, not nullishness, so a present null/undefined first element is preserved.
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return arr.length > 0 ? arr[0]! : defaultValue;
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}
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@@ -0,0 +1,16 @@
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import { describe, expectTypeOf, it } from 'vitest';
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import { groupBy } from '.';
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describe('groupBy', () => {
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it('keys the record by the union returned by the key function', () => {
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const result = groupBy([1, 2, 3], n => (n % 2 === 0 ? 'even' : 'odd'));
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expectTypeOf(result).toEqualTypeOf<Record<'even' | 'odd', number[]>>();
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});
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it('preserves the element type in the grouped arrays', () => {
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const result = groupBy([{ id: 1 }], item => item.id);
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expectTypeOf(result).toEqualTypeOf<Record<number, Array<{ id: number }>>>();
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});
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});
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@@ -0,0 +1,48 @@
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import { describe, expect, it } from 'vitest';
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import { groupBy } from '.';
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describe('groupBy', () => {
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it('group by a string key', () => {
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const result = groupBy([1, 2, 3, 4], n => (n % 2 === 0 ? 'even' : 'odd'));
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expect(result).toEqual({ odd: [1, 3], even: [2, 4] });
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});
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it('group objects by a property', () => {
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const input = [
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{ type: 'a', v: 1 },
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{ type: 'b', v: 2 },
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{ type: 'a', v: 3 },
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];
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expect(groupBy(input, item => item.type)).toEqual({
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a: [{ type: 'a', v: 1 }, { type: 'a', v: 3 }],
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b: [{ type: 'b', v: 2 }],
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});
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});
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it('pass the index to the key function', () => {
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const result = groupBy(['a', 'b', 'c', 'd'], (_, i) => i % 2);
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expect(result).toEqual({ 0: ['a', 'c'], 1: ['b', 'd'] });
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});
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it('return an empty object for an empty array', () => {
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expect(groupBy([], () => 'x')).toEqual({});
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});
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it('push elements by reference (no cloning)', () => {
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const item = { id: 1 };
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const result = groupBy([item], x => x.id);
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expect(result[1]![0]).toBe(item);
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});
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it('handle __proto__ and other Object.prototype keys as ordinary groups', () => {
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const proto = groupBy(['a', 'b'], (): string => '__proto__');
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expect(proto.__proto__).toEqual(['a', 'b']);
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const ctor = groupBy(['x'], (): string => 'constructor');
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expect(ctor.constructor).toEqual(['x']);
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});
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});
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@@ -0,0 +1,36 @@
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/**
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* @name groupBy
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* @category Arrays
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* @description Groups the elements of an array by the key returned by `getKey`
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*
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* @param {Value[]} array - The array to group
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* @param {(item: Value, index: number) => Key} getKey - Maps an element to its group key
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* @returns {Record<Key, Value[]>} An object of arrays, keyed by group
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*
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* @example
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* groupBy([1, 2, 3, 4], n => (n % 2 === 0 ? 'even' : 'odd'))
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* // => { odd: [1, 3], even: [2, 4] }
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*
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* @example
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* groupBy([{ type: 'a', v: 1 }, { type: 'b', v: 2 }, { type: 'a', v: 3 }], item => item.type)
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* // => { a: [{ type: 'a', v: 1 }, { type: 'a', v: 3 }], b: [{ type: 'b', v: 2 }] }
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*
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* @since 0.0.10
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*/
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export function groupBy<Value, Key extends PropertyKey>(
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array: Value[],
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getKey: (item: Value, index: number) => Key,
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): Record<Key, Value[]> {
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// Null-prototype object so keys like '__proto__'/'constructor' become ordinary own keys
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// instead of colliding with Object.prototype (which would throw on .push or pollute).
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const result = Object.create(null) as Record<Key, Value[]>;
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for (let i = 0; i < array.length; i++) {
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const item = array[i]!;
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const key = getKey(item, i);
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(result[key] ??= []).push(item);
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}
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return result;
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}
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@@ -1,5 +1,10 @@
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export * from './cluster';
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export * from './first';
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export * from './groupBy';
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export * from './last';
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export * from './partition';
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export * from './range';
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export * from './sum';
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export * from './toArray';
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export * from './unique';
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export * from './zip';
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@@ -1,4 +1,4 @@
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import { describe, it, expect } from 'vitest';
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import { describe, expect, it } from 'vitest';
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import { last } from '.';
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describe('last', () => {
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@@ -20,4 +20,10 @@ describe('last', () => {
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expect(last([1, 2, 3], 42)).toBe(3);
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expect(last(['a', 'b', 'c'], 'default')).toBe('c');
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});
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it('preserve a present null/undefined/falsy last element (not the default)', () => {
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expect(last([1, null as number | null], 42)).toBeNull();
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expect(last([1, undefined], 42)).toBeUndefined();
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expect(last([0], 99)).toBe(0);
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});
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});
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@@ -16,5 +16,6 @@
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* @since 0.0.3
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*/
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export function last<Value>(arr: Value[], defaultValue?: Value) {
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return arr[arr.length - 1] ?? defaultValue;
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// Branch on length, not nullishness, so a present null/undefined last element is preserved.
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return arr.length > 0 ? arr[arr.length - 1]! : defaultValue;
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}
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@@ -0,0 +1,17 @@
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import { describe, expectTypeOf, it } from 'vitest';
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import { partition } from '.';
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describe('partition', () => {
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it('returns a tuple of two arrays of the element type', () => {
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const result = partition([1, 2, 3], n => n > 1);
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expectTypeOf(result).toEqualTypeOf<[number[], number[]]>();
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});
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it('narrows both partitions with a type guard', () => {
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const mixed: Array<string | number> = ['a', 1];
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const result = partition(mixed, (v): v is string => typeof v === 'string');
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expectTypeOf(result).toEqualTypeOf<[string[], number[]]>();
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});
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});
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@@ -0,0 +1,29 @@
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import { describe, expect, it } from 'vitest';
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import { partition } from '.';
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describe('partition', () => {
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it('split by a predicate into [matching, rest]', () => {
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expect(partition([1, 2, 3, 4], n => n % 2 === 0)).toEqual([[2, 4], [1, 3]]);
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});
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it('preserve order within each partition', () => {
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expect(partition([5, 1, 4, 2, 3], n => n > 2)).toEqual([[5, 4, 3], [1, 2]]);
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});
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it('pass the index to the predicate', () => {
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expect(partition(['a', 'b', 'c', 'd'], (_, i) => i < 2)).toEqual([['a', 'b'], ['c', 'd']]);
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});
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it('handle all-matching and none-matching', () => {
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expect(partition([1, 2, 3], () => true)).toEqual([[1, 2, 3], []]);
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expect(partition([1, 2, 3], () => false)).toEqual([[], [1, 2, 3]]);
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});
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it('work with a type guard', () => {
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const mixed: Array<string | number> = ['a', 1, 'b', 2];
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const [strings, numbers] = partition(mixed, (v): v is string => typeof v === 'string');
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expect(strings).toEqual(['a', 'b']);
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expect(numbers).toEqual([1, 2]);
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});
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});
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@@ -0,0 +1,43 @@
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/**
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* @name partition
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* @category Arrays
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* @description Splits an array into two: elements that satisfy the predicate and those that do not
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*
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* @param {Value[]} array - The array to split
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* @param {(item: Value, index: number) => boolean} predicate - Decides which partition an element belongs to
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* @returns {[Value[], Value[]]} A tuple of `[matching, rest]`
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*
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* @example
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* partition([1, 2, 3, 4], n => n % 2 === 0) // => [[2, 4], [1, 3]]
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*
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* @example
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* const [strings, others] = partition(mixed, (v): v is string => typeof v === 'string');
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*
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* @since 0.0.10
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*/
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export function partition<Value, Matched extends Value>(
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array: Value[],
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predicate: (item: Value, index: number) => item is Matched,
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): [Matched[], Array<Exclude<Value, Matched>>];
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export function partition<Value>(
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array: Value[],
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predicate: (item: Value, index: number) => boolean,
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): [Value[], Value[]];
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export function partition<Value>(
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array: Value[],
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predicate: (item: Value, index: number) => boolean,
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): [Value[], Value[]] {
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const matched: Value[] = [];
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const rest: Value[] = [];
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for (let i = 0; i < array.length; i++) {
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const item = array[i]!;
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if (predicate(item, i))
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matched.push(item);
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else
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rest.push(item);
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}
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return [matched, rest];
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}
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@@ -0,0 +1,47 @@
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import { describe, expect, it } from 'vitest';
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import { range } from '.';
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describe('range', () => {
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it('generate 0..stop with a single argument', () => {
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expect(range(4)).toEqual([0, 1, 2, 3]);
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});
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it('generate start..stop', () => {
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expect(range(1, 5)).toEqual([1, 2, 3, 4]);
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});
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it('respect a positive step', () => {
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expect(range(0, 10, 2)).toEqual([0, 2, 4, 6, 8]);
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});
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it('support a negative step', () => {
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expect(range(5, 0, -1)).toEqual([5, 4, 3, 2, 1]);
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});
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it('return an empty array for an empty range', () => {
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expect(range(0)).toEqual([]);
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expect(range(5, 5)).toEqual([]);
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expect(range(0, 5, -1)).toEqual([]);
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});
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it('return an empty array for a zero step', () => {
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expect(range(0, 5, 0)).toEqual([]);
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});
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it('handle non-integer steps', () => {
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expect(range(0, 1, 0.25)).toEqual([0, 0.25, 0.5, 0.75]);
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});
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it('span zero with a negative start', () => {
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expect(range(-2, 3)).toEqual([-2, -1, 0, 1, 2]);
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expect(range(-3, 3, 2)).toEqual([-3, -1, 1]);
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});
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it('handle a non-integer step that is not exactly representable', () => {
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const result = range(0, 1, 0.1);
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expect(result).toHaveLength(10);
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expect(result[0]).toBe(0);
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expect(result.at(-1)).toBeCloseTo(0.9, 10);
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});
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});
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@@ -0,0 +1,41 @@
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/**
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* @name range
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* @category Arrays
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* @description Generates an array of numbers from `start` (inclusive) to `stop` (exclusive)
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*
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* @param {number} startOrStop - The start of the range, or the stop when called with one argument
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* @param {number} [stop] - The end of the range (exclusive)
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* @param {number} [step] - The increment between values; supports negative steps. Default `1`
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* @returns {number[]} The generated range
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*
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* @example
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* range(4) // => [0, 1, 2, 3]
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*
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* @example
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* range(1, 5) // => [1, 2, 3, 4]
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*
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* @example
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* range(0, 10, 2) // => [0, 2, 4, 6, 8]
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*
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* @example
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* range(5, 0, -1) // => [5, 4, 3, 2, 1]
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*
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* @since 0.0.10
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*/
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export function range(stop: number): number[];
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export function range(start: number, stop: number, step?: number): number[];
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export function range(startOrStop: number, stop?: number, step = 1): number[] {
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let start = startOrStop;
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if (stop === undefined) {
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start = 0;
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stop = startOrStop;
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}
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if (step === 0)
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return [];
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const length = Math.max(Math.ceil((stop - start) / step), 0);
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return Array.from({ length }, (_, i) => start + i * step);
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}
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@@ -1,4 +1,4 @@
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import { describe, it, expect } from 'vitest';
|
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import { describe, expect, it } from 'vitest';
|
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import { sum } from '.';
|
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|
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describe('sum', () => {
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|
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@@ -0,0 +1,17 @@
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import { describe, expectTypeOf, it } from 'vitest';
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import { toArray } from '.';
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|
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describe('toArray', () => {
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it('wraps a single value into an array of that type', () => {
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expectTypeOf(toArray(1)).toEqualTypeOf<number[]>();
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});
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it('returns an array input as the same element type', () => {
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expectTypeOf(toArray([1, 2, 3])).toEqualTypeOf<number[]>();
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});
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|
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it('returns the element array type for a nullish input', () => {
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expectTypeOf(toArray<string>(undefined)).toEqualTypeOf<string[]>();
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expectTypeOf(toArray<number>(null)).toEqualTypeOf<number[]>();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,26 @@
|
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import { describe, expect, it } from 'vitest';
|
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import { toArray } from '.';
|
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|
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describe('toArray', () => {
|
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it('wrap a single value into an array', () => {
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expect(toArray(1)).toEqual([1]);
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expect(toArray('a')).toEqual(['a']);
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expect(toArray(false)).toEqual([false]);
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expect(toArray(0)).toEqual([0]);
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});
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|
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it('return arrays as-is (same reference, no copy)', () => {
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const arr = [1, 2, 3];
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expect(toArray(arr)).toBe(arr);
|
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});
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|
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it('treat null and undefined as empty', () => {
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expect(toArray(undefined)).toEqual([]);
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expect(toArray(null)).toEqual([]);
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});
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|
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it('preserve empty arrays', () => {
|
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const empty: number[] = [];
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expect(toArray(empty)).toBe(empty);
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});
|
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});
|
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@@ -0,0 +1,25 @@
|
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import type { Arrayable } from '../../types';
|
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|
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/**
|
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* @name toArray
|
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* @category Arrays
|
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* @description Normalize an `Arrayable<T>` value into an array. `undefined` and `null` become an empty array; a single value is wrapped; arrays are returned as-is (no copy).
|
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*
|
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* @param {Arrayable<Value> | null | undefined} value The value to normalize
|
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* @returns {Value[]} The value as an array
|
||||
*
|
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* @example
|
||||
* toArray(1) // => [1]
|
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*
|
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* @example
|
||||
* toArray([1, 2]) // => [1, 2]
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*
|
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* @example
|
||||
* toArray(undefined) // => []
|
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*
|
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* @since 0.0.10
|
||||
*/
|
||||
export function toArray<Value>(value: Arrayable<Value> | null | undefined): Value[] {
|
||||
if (value === null || value === undefined) return [];
|
||||
return Array.isArray(value) ? value : [value];
|
||||
}
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { unique } from '.';
|
||||
|
||||
describe('unique', () => {
|
||||
@@ -42,4 +42,28 @@ describe('unique', () => {
|
||||
|
||||
expect(result).toEqual([]);
|
||||
});
|
||||
|
||||
it('keep the last value per extracted key (last-write-wins, first-seen order)', () => {
|
||||
const result = unique(
|
||||
[{ id: 1, v: 'a' }, { id: 2, v: 'b' }, { id: 1, v: 'c' }],
|
||||
item => item.id,
|
||||
);
|
||||
|
||||
expect(result).toEqual([{ id: 1, v: 'c' }, { id: 2, v: 'b' }]);
|
||||
});
|
||||
|
||||
it('return a new array and not mutate the input', () => {
|
||||
const input = [1, 2, 2, 3];
|
||||
const result = unique(input);
|
||||
|
||||
expect(result).not.toBe(input);
|
||||
expect(input).toEqual([1, 2, 2, 3]);
|
||||
});
|
||||
|
||||
it('preserve element identity for object values', () => {
|
||||
const a = { id: 1 };
|
||||
const result = unique([a], item => item.id);
|
||||
|
||||
expect(result[0]).toBe(a);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -14,20 +14,23 @@ export type Extractor<Value, Key extends UniqueKey> = (value: Value) => Key;
|
||||
* unique([1, 2, 3, 3, 4, 5, 5, 6]) //=> [1, 2, 3, 4, 5, 6]
|
||||
*
|
||||
* @example
|
||||
* unique([{ id: 1 }, { id: 2 }, { id: 1 }], (a, b) => a.id === b.id) //=> [{ id: 1 }, { id: 2 }]
|
||||
* unique([{ id: 1 }, { id: 2 }, { id: 1 }], value => value.id) //=> [{ id: 1 }, { id: 2 }]
|
||||
*
|
||||
* @since 0.0.3
|
||||
*/
|
||||
export function unique<Value, Key extends UniqueKey>(
|
||||
array: Value[],
|
||||
extractor?: Extractor<Value, Key>,
|
||||
) {
|
||||
): Value[] {
|
||||
// Fast path: a plain Set is leaner than a Map storing each value as both key and value.
|
||||
if (!extractor)
|
||||
return [...new Set(array)];
|
||||
|
||||
// Last-write-wins per extracted key, preserving first-seen insertion order.
|
||||
const values = new Map<Key, Value>();
|
||||
|
||||
for (const value of array) {
|
||||
const key = extractor ? extractor(value) : value as any;
|
||||
values.set(key, value);
|
||||
}
|
||||
for (const value of array)
|
||||
values.set(extractor(value), value);
|
||||
|
||||
return Array.from(values.values());
|
||||
return [...values.values()];
|
||||
}
|
||||
|
||||
@@ -0,0 +1,27 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { zip } from '.';
|
||||
|
||||
describe('zip', () => {
|
||||
it('produces tuples of the element types (two arrays)', () => {
|
||||
const result = zip([1, 2], ['a', 'b']);
|
||||
|
||||
expectTypeOf(result).toEqualTypeOf<Array<[number, string]>>();
|
||||
});
|
||||
|
||||
it('produces tuples of the element types (three arrays)', () => {
|
||||
const result = zip([1], ['a'], [true]);
|
||||
|
||||
expectTypeOf(result).toEqualTypeOf<Array<[number, string, boolean]>>();
|
||||
});
|
||||
|
||||
it('zips a single array into singleton tuples', () => {
|
||||
const result = zip([1, 2, 3]);
|
||||
|
||||
expectTypeOf(result).toEqualTypeOf<Array<[number]>>();
|
||||
});
|
||||
|
||||
it('produces tuples for four and five arrays', () => {
|
||||
expectTypeOf(zip([1], ['a'], [true], [9])).toEqualTypeOf<Array<[number, string, boolean, number]>>();
|
||||
expectTypeOf(zip([1], ['a'], [true], [9], ['x'])).toEqualTypeOf<Array<[number, string, boolean, number, string]>>();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,35 @@
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { zip } from '.';
|
||||
|
||||
describe('zip', () => {
|
||||
it('zip two arrays of equal length', () => {
|
||||
expect(zip([1, 2, 3], ['a', 'b', 'c'])).toEqual([[1, 'a'], [2, 'b'], [3, 'c']]);
|
||||
});
|
||||
|
||||
it('zip three arrays', () => {
|
||||
expect(zip([1, 2], ['a', 'b'], [true, false])).toEqual([[1, 'a', true], [2, 'b', false]]);
|
||||
});
|
||||
|
||||
it('truncate to the shortest array', () => {
|
||||
expect(zip([1, 2, 3], ['a'])).toEqual([[1, 'a']]);
|
||||
expect(zip([1], ['a', 'b', 'c'])).toEqual([[1, 'a']]);
|
||||
});
|
||||
|
||||
it('zip a single array into singletons', () => {
|
||||
expect(zip([1, 2, 3])).toEqual([[1], [2], [3]]);
|
||||
});
|
||||
|
||||
it('return an empty array when an input is empty', () => {
|
||||
expect(zip([1, 2, 3], [])).toEqual([]);
|
||||
});
|
||||
|
||||
it('return an empty array with no arguments', () => {
|
||||
expect((zip as () => unknown[])()).toEqual([]);
|
||||
});
|
||||
|
||||
it('zip four and five arrays', () => {
|
||||
expect(zip([1], ['a'], [true], [9])).toEqual([[1, 'a', true, 9]]);
|
||||
expect(zip([1, 2], ['a', 'b'], [true, false], [9, 8], ['x', 'y']))
|
||||
.toEqual([[1, 'a', true, 9, 'x'], [2, 'b', false, 8, 'y']]);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,35 @@
|
||||
/**
|
||||
* @name zip
|
||||
* @category Arrays
|
||||
* @description Combines several arrays into an array of tuples, stopping at the shortest input
|
||||
*
|
||||
* @param {...Array} arrays - The arrays to zip together
|
||||
* @returns {Array} An array of tuples; its length equals the shortest input array
|
||||
*
|
||||
* @example
|
||||
* zip([1, 2, 3], ['a', 'b', 'c']) // => [[1, 'a'], [2, 'b'], [3, 'c']]
|
||||
*
|
||||
* @example
|
||||
* zip([1, 2], ['a', 'b'], [true, false]) // => [[1, 'a', true], [2, 'b', false]]
|
||||
*
|
||||
* @example
|
||||
* zip([1, 2, 3], ['a']) // => [[1, 'a']] (truncated to the shortest)
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function zip<A>(a: A[]): Array<[A]>;
|
||||
export function zip<A, B>(a: A[], b: B[]): Array<[A, B]>;
|
||||
export function zip<A, B, C>(a: A[], b: B[], c: C[]): Array<[A, B, C]>;
|
||||
export function zip<A, B, C, D>(a: A[], b: B[], c: C[], d: D[]): Array<[A, B, C, D]>;
|
||||
export function zip<A, B, C, D, E>(a: A[], b: B[], c: C[], d: D[], e: E[]): Array<[A, B, C, D, E]>;
|
||||
export function zip(...arrays: any[][]): any[][] {
|
||||
if (arrays.length === 0)
|
||||
return [];
|
||||
|
||||
let length = arrays[0]!.length;
|
||||
|
||||
for (let i = 1; i < arrays.length; i++)
|
||||
length = Math.min(length, arrays[i]!.length);
|
||||
|
||||
return Array.from({ length }, (_, i) => arrays.map(array => array[i]));
|
||||
}
|
||||
@@ -1,3 +1,4 @@
|
||||
export * from './pool';
|
||||
export * from './retry';
|
||||
export * from './sleep';
|
||||
export * from './tryIt';
|
||||
|
||||
@@ -0,0 +1,438 @@
|
||||
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { AsyncPool } from '.';
|
||||
|
||||
describe('AsyncPool', () => {
|
||||
beforeEach(() => {
|
||||
vi.useFakeTimers();
|
||||
});
|
||||
|
||||
afterEach(() => {
|
||||
vi.useRealTimers();
|
||||
});
|
||||
|
||||
// ── Constructor / getters ────────────────────────────────────────────────
|
||||
|
||||
describe('constructor', () => {
|
||||
it('default concurrency is Infinity', () => {
|
||||
expect(new AsyncPool().concurrency).toBe(Infinity);
|
||||
});
|
||||
|
||||
it('respects explicit concurrency', () => {
|
||||
expect(new AsyncPool({ concurrency: 4 }).concurrency).toBe(4);
|
||||
});
|
||||
|
||||
it('truncates float to integer', () => {
|
||||
expect(new AsyncPool({ concurrency: 3.9 }).concurrency).toBe(3);
|
||||
});
|
||||
|
||||
it('Infinity concurrency is preserved (not coerced to 0)', () => {
|
||||
expect(new AsyncPool({ concurrency: Infinity }).concurrency).toBe(Infinity);
|
||||
});
|
||||
|
||||
it('invalid values fall back to Infinity', () => {
|
||||
expect(new AsyncPool({ concurrency: 0 }).concurrency).toBe(Infinity);
|
||||
expect(new AsyncPool({ concurrency: -1 }).concurrency).toBe(Infinity);
|
||||
});
|
||||
|
||||
it('initial size and active are 0', () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
expect(pool.size).toBe(0);
|
||||
expect(pool.active).toBe(0);
|
||||
});
|
||||
});
|
||||
|
||||
// ── add() — basic execution ──────────────────────────────────────────────
|
||||
|
||||
describe('add()', () => {
|
||||
it('starts task immediately when under limit', () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
const fn = vi.fn().mockResolvedValue('ok');
|
||||
pool.add(fn);
|
||||
expect(fn).toHaveBeenCalledTimes(1);
|
||||
expect(pool.active).toBe(1);
|
||||
});
|
||||
|
||||
it('passes the pool signal to the task', () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
let receivedSignal: AbortSignal | undefined;
|
||||
pool.add((signal) => {
|
||||
receivedSignal = signal;
|
||||
return Promise.resolve();
|
||||
});
|
||||
expect(receivedSignal).toBeInstanceOf(AbortSignal);
|
||||
});
|
||||
|
||||
it('returns the task result', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
const result = await pool.add(() => Promise.resolve(42));
|
||||
expect(result).toBe(42);
|
||||
});
|
||||
|
||||
it('propagates task rejection', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
const error = new Error('boom');
|
||||
await expect(pool.add(() => Promise.reject(error))).rejects.toThrow('boom');
|
||||
});
|
||||
});
|
||||
|
||||
// ── Concurrency limiting ─────────────────────────────────────────────────
|
||||
|
||||
describe('concurrency limiting', () => {
|
||||
it('does not exceed the concurrency limit', () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
const fn = vi.fn(() => new Promise<void>(() => {}));
|
||||
pool.add(fn);
|
||||
pool.add(fn);
|
||||
pool.add(fn); // queued
|
||||
expect(fn).toHaveBeenCalledTimes(2);
|
||||
expect(pool.active).toBe(2);
|
||||
expect(pool.size).toBe(1);
|
||||
});
|
||||
|
||||
it('dequeues task when an active one completes', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
let resolve1!: () => void;
|
||||
const task1 = vi.fn(() => new Promise<void>(r => (resolve1 = r)));
|
||||
const task2 = vi.fn(() => Promise.resolve());
|
||||
pool.add(task1);
|
||||
pool.add(task2);
|
||||
expect(task2).toHaveBeenCalledTimes(0);
|
||||
resolve1();
|
||||
await Promise.resolve();
|
||||
await Promise.resolve(); // two microtask ticks for then handlers
|
||||
expect(task2).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('runs tasks in FIFO order', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
const order: number[] = [];
|
||||
let unblock!: () => void;
|
||||
pool.add(() => new Promise<void>(r => (unblock = r)));
|
||||
pool.add(async () => {
|
||||
order.push(1);
|
||||
});
|
||||
pool.add(async () => {
|
||||
order.push(2);
|
||||
});
|
||||
unblock();
|
||||
await pool.all();
|
||||
expect(order).toEqual([1, 2]);
|
||||
});
|
||||
|
||||
it('respects concurrency across many tasks', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 3 });
|
||||
let concurrent = 0;
|
||||
let maxConcurrent = 0;
|
||||
const tasks = Array.from({ length: 9 }, () => async (_signal: AbortSignal) => {
|
||||
concurrent++;
|
||||
maxConcurrent = Math.max(maxConcurrent, concurrent);
|
||||
await Promise.resolve();
|
||||
concurrent--;
|
||||
});
|
||||
await Promise.all(tasks.map(t => pool.add(t)));
|
||||
expect(maxConcurrent).toBeLessThanOrEqual(3);
|
||||
});
|
||||
|
||||
it('starts all tasks immediately with Infinity concurrency', () => {
|
||||
const pool = new AsyncPool();
|
||||
const fn = vi.fn(() => new Promise<void>(() => {}));
|
||||
for (let i = 0; i < 10; i++) pool.add(fn);
|
||||
expect(fn).toHaveBeenCalledTimes(10);
|
||||
expect(pool.size).toBe(0);
|
||||
});
|
||||
});
|
||||
|
||||
// ── concurrency setter ───────────────────────────────────────────────────
|
||||
|
||||
describe('concurrency setter', () => {
|
||||
it('increasing concurrency starts queued tasks immediately', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
const fn = vi.fn(() => new Promise<void>(() => {}));
|
||||
pool.add(fn);
|
||||
pool.add(fn);
|
||||
pool.add(fn);
|
||||
expect(fn).toHaveBeenCalledTimes(1);
|
||||
pool.concurrency = 3;
|
||||
expect(fn).toHaveBeenCalledTimes(3);
|
||||
expect(pool.size).toBe(0);
|
||||
});
|
||||
|
||||
it('decreasing concurrency does not stop running tasks', () => {
|
||||
const pool = new AsyncPool({ concurrency: 3 });
|
||||
const fn = vi.fn(() => new Promise<void>(() => {}));
|
||||
pool.add(fn);
|
||||
pool.add(fn);
|
||||
pool.add(fn);
|
||||
pool.concurrency = 1;
|
||||
expect(pool.active).toBe(3); // already running tasks are not stopped
|
||||
});
|
||||
|
||||
it('invalid value falls back to Infinity', () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
pool.concurrency = -5;
|
||||
expect(pool.concurrency).toBe(Infinity);
|
||||
});
|
||||
});
|
||||
|
||||
// ── all() ────────────────────────────────────────────────────────────────
|
||||
|
||||
describe('all()', () => {
|
||||
it('resolves immediately when pool is empty', async () => {
|
||||
await expect(new AsyncPool().all()).resolves.toBeUndefined();
|
||||
});
|
||||
|
||||
it('waits for all tasks to complete', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
const completed: number[] = [];
|
||||
pool.add(async () => {
|
||||
completed.push(1);
|
||||
});
|
||||
pool.add(async () => {
|
||||
completed.push(2);
|
||||
});
|
||||
await pool.all();
|
||||
expect(completed).toEqual([1, 2]);
|
||||
});
|
||||
|
||||
it('throws AggregateError when any task fails', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
pool.add(() => Promise.reject(new Error('e1'))).catch(() => {});
|
||||
pool.add(() => Promise.reject(new Error('e2'))).catch(() => {});
|
||||
pool.add(() => Promise.resolve('ok'));
|
||||
await expect(pool.all()).rejects.toBeInstanceOf(AggregateError);
|
||||
});
|
||||
|
||||
it('AggregateError contains all failures', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
const e1 = new Error('e1');
|
||||
const e2 = new Error('e2');
|
||||
pool.add(() => Promise.reject(e1)).catch(() => {});
|
||||
pool.add(() => Promise.reject(e2)).catch(() => {});
|
||||
try {
|
||||
await pool.all();
|
||||
}
|
||||
catch (err) {
|
||||
expect(err).toBeInstanceOf(AggregateError);
|
||||
expect((err as AggregateError).errors).toContain(e1);
|
||||
expect((err as AggregateError).errors).toContain(e2);
|
||||
}
|
||||
});
|
||||
|
||||
it('multiple concurrent callers share the same underlying drain', () => {
|
||||
// all() wraps _drain.promise in .then() each call (different outer promises),
|
||||
// but allSettled() returns the raw _drain.promise — verify that is idempotent
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
pool.add(() => new Promise<void>(() => {}));
|
||||
expect(pool.allSettled()).toBe(pool.allSettled());
|
||||
});
|
||||
|
||||
it('resets after each drain cycle', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
pool.add(() => Promise.resolve());
|
||||
await pool.all();
|
||||
// second batch
|
||||
pool.add(() => Promise.resolve());
|
||||
await pool.all(); // should not throw or hang
|
||||
expect(pool.active).toBe(0);
|
||||
});
|
||||
});
|
||||
|
||||
// ── allSettled() ─────────────────────────────────────────────────────────
|
||||
|
||||
describe('allSettled()', () => {
|
||||
it('resolves immediately with empty array when pool is empty', async () => {
|
||||
await expect(new AsyncPool().allSettled()).resolves.toEqual([]);
|
||||
});
|
||||
|
||||
it('returns fulfilled results', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
pool.add(() => Promise.resolve(1));
|
||||
pool.add(() => Promise.resolve(2));
|
||||
const results = await pool.allSettled();
|
||||
expect(results).toHaveLength(2);
|
||||
expect(results.every(r => r.status === 'fulfilled')).toBe(true);
|
||||
});
|
||||
|
||||
it('returns mix of fulfilled and rejected', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
pool.add(() => Promise.resolve('ok'));
|
||||
pool.add(() => Promise.reject(new Error('fail'))).catch(() => {});
|
||||
const results = await pool.allSettled();
|
||||
expect(results.some(r => r.status === 'fulfilled')).toBe(true);
|
||||
expect(results.some(r => r.status === 'rejected')).toBe(true);
|
||||
});
|
||||
|
||||
it('all() and allSettled() called simultaneously share the same promise', () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
pool.add(() => new Promise<void>(() => {}));
|
||||
// Both chain off the same underlying _drain.promise
|
||||
const a = pool.allSettled();
|
||||
const b = pool.allSettled();
|
||||
expect(a).toBe(b);
|
||||
});
|
||||
|
||||
it('results are cleared after each cycle', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
pool.add(() => Promise.resolve('first'));
|
||||
const r1 = await pool.allSettled();
|
||||
expect(r1).toHaveLength(1);
|
||||
|
||||
pool.add(() => Promise.resolve('second'));
|
||||
const r2 = await pool.allSettled();
|
||||
expect(r2).toHaveLength(1); // only new-batch results
|
||||
});
|
||||
});
|
||||
|
||||
// ── size / active getters ────────────────────────────────────────────────
|
||||
|
||||
describe('size / active', () => {
|
||||
it('active reflects currently running tasks', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
let resolve1!: () => void;
|
||||
const p = pool.add(() => new Promise<void>(r => (resolve1 = r)));
|
||||
expect(pool.active).toBe(1);
|
||||
resolve1();
|
||||
await p;
|
||||
expect(pool.active).toBe(0);
|
||||
});
|
||||
|
||||
it('size reflects queued count', () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
const neverResolve = () => new Promise<void>(() => {});
|
||||
pool.add(neverResolve);
|
||||
pool.add(neverResolve);
|
||||
pool.add(neverResolve);
|
||||
expect(pool.active).toBe(1);
|
||||
expect(pool.size).toBe(2);
|
||||
});
|
||||
});
|
||||
|
||||
// ── AbortSignal / cancellation ───────────────────────────────────────────
|
||||
|
||||
describe('signal / abort', () => {
|
||||
it('add() after abort rejects immediately', async () => {
|
||||
const controller = new AbortController();
|
||||
const pool = new AsyncPool({ concurrency: 2, signal: controller.signal });
|
||||
controller.abort(new Error('cancelled'));
|
||||
await expect(pool.add(() => Promise.resolve())).rejects.toThrow('cancelled');
|
||||
});
|
||||
|
||||
it('queued tasks are rejected on abort', async () => {
|
||||
const controller = new AbortController();
|
||||
const pool = new AsyncPool({ concurrency: 1, signal: controller.signal });
|
||||
pool.add(() => new Promise<void>(() => {})); // blocks the slot
|
||||
const queued = pool.add(() => Promise.resolve('queued'));
|
||||
controller.abort();
|
||||
await expect(queued).rejects.toBeDefined();
|
||||
});
|
||||
|
||||
it('running tasks receive the aborted signal', async () => {
|
||||
const controller = new AbortController();
|
||||
const pool = new AsyncPool({ concurrency: 1, signal: controller.signal });
|
||||
let taskSignal!: AbortSignal;
|
||||
const taskDone = pool.add((signal) => {
|
||||
taskSignal = signal;
|
||||
return new Promise<void>((resolve) => {
|
||||
signal.addEventListener('abort', () => resolve());
|
||||
});
|
||||
});
|
||||
controller.abort();
|
||||
await taskDone;
|
||||
expect(taskSignal.aborted).toBe(true);
|
||||
});
|
||||
|
||||
it('allSettled() resolves after abort with rejected entries', async () => {
|
||||
const controller = new AbortController();
|
||||
const pool = new AsyncPool({ concurrency: 1, signal: controller.signal });
|
||||
// Active task listens to signal and resolves on abort
|
||||
pool.add(signal => new Promise<void>((resolve) => {
|
||||
signal.addEventListener('abort', () => resolve(), { once: true });
|
||||
}));
|
||||
pool.add(() => Promise.resolve()).catch(() => {}); // queued — rejected on abort
|
||||
controller.abort();
|
||||
const results = await pool.allSettled();
|
||||
expect(results.some(r => r.status === 'rejected')).toBe(true);
|
||||
});
|
||||
|
||||
it('all() rejects with an AggregateError including the abort reason', async () => {
|
||||
const controller = new AbortController();
|
||||
const pool = new AsyncPool({ concurrency: 1, signal: controller.signal });
|
||||
const reason = new Error('cancelled');
|
||||
|
||||
pool.add(signal => new Promise<void>((resolve) => {
|
||||
signal.addEventListener('abort', () => resolve(), { once: true });
|
||||
}));
|
||||
pool.add(() => Promise.resolve()).catch(() => {}); // queued — rejected on abort
|
||||
controller.abort(reason);
|
||||
|
||||
await expect(pool.all()).rejects.toBeInstanceOf(AggregateError);
|
||||
});
|
||||
|
||||
it('dispose() detaches the abort listener', () => {
|
||||
const controller = new AbortController();
|
||||
const removeSpy = vi.spyOn(controller.signal, 'removeEventListener');
|
||||
const pool = new AsyncPool({ signal: controller.signal });
|
||||
|
||||
pool.dispose();
|
||||
|
||||
expect(removeSpy).toHaveBeenCalledWith('abort', expect.any(Function));
|
||||
});
|
||||
});
|
||||
|
||||
// ── Error resilience ─────────────────────────────────────────────────────
|
||||
|
||||
describe('error resilience', () => {
|
||||
it('rejected task does not block subsequent tasks', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
const completed: string[] = [];
|
||||
pool.add(() => Promise.reject(new Error('fail'))).catch(() => {});
|
||||
pool.add(async () => {
|
||||
completed.push('second');
|
||||
});
|
||||
await pool.all().catch(() => {});
|
||||
expect(completed).toContain('second');
|
||||
});
|
||||
|
||||
it('rejected task does not corrupt active count', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
await pool.add(() => Promise.reject(new Error('fail'))).catch(() => {});
|
||||
expect(pool.active).toBe(0);
|
||||
});
|
||||
|
||||
it('a synchronously-throwing task rejects instead of wedging the pool', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
|
||||
await expect(pool.add(() => {
|
||||
throw new Error('sync');
|
||||
})).rejects.toThrow('sync');
|
||||
|
||||
// The slot must be released, not leaked.
|
||||
expect(pool.active).toBe(0);
|
||||
|
||||
// Subsequent tasks still run.
|
||||
await expect(pool.add(() => Promise.resolve('next'))).resolves.toBe('next');
|
||||
});
|
||||
});
|
||||
|
||||
// ── Results survive a drained batch ──────────────────────────────────────
|
||||
|
||||
describe('drain before waiter', () => {
|
||||
it('allSettled() still sees results when the batch drained first', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 2 });
|
||||
|
||||
await pool.add(() => Promise.resolve(1));
|
||||
await pool.add(() => Promise.resolve(2));
|
||||
|
||||
const results = await pool.allSettled();
|
||||
expect(results).toHaveLength(2);
|
||||
});
|
||||
|
||||
it('all() still throws after a failing task drained first', async () => {
|
||||
const pool = new AsyncPool({ concurrency: 1 });
|
||||
|
||||
await pool.add(() => Promise.reject(new Error('boom'))).catch(() => {});
|
||||
|
||||
await expect(pool.all()).rejects.toBeInstanceOf(AggregateError);
|
||||
});
|
||||
});
|
||||
});
|
||||
@@ -1,3 +1,244 @@
|
||||
import { CircularBuffer } from '../../structs/CircularBuffer';
|
||||
import { isNumber } from '../../types';
|
||||
|
||||
export interface AsyncPoolOptions {
|
||||
concurrency?: number;
|
||||
signal?: AbortSignal;
|
||||
}
|
||||
|
||||
interface PoolEntry<T = any> {
|
||||
task: (signal: AbortSignal) => Promise<T>;
|
||||
resolve: (value: T) => void;
|
||||
reject: (reason: unknown) => void;
|
||||
}
|
||||
|
||||
// Shared sentinel — never aborts, avoids allocating AbortController per instance when no signal
|
||||
const NEVER_ABORT_SIGNAL: AbortSignal = /* @__PURE__ */ new AbortController().signal;
|
||||
|
||||
// Normalizes concurrency option to a positive integer or Infinity.
|
||||
// Note: (Infinity | 0) === 0 in JS — the `|| Infinity` trick recovers the correct value.
|
||||
function normalizeConcurrency(value: unknown): number {
|
||||
return (isNumber(value) && value > 0) ? (value | 0) || Infinity : Infinity;
|
||||
}
|
||||
|
||||
/**
|
||||
* @name AsyncPool
|
||||
* @category Async
|
||||
* @description A concurrency-limited async task pool with AbortSignal support.
|
||||
* Tasks start immediately when under the concurrency limit and are queued otherwise.
|
||||
* Each task receives the pool's AbortSignal for cooperative cancellation.
|
||||
*
|
||||
* Use `all()` to wait for all tasks (throws AggregateError on any failure)
|
||||
* or `allSettled()` to inspect individual results — mirroring the Promise static API.
|
||||
*
|
||||
* @example
|
||||
* const pool = new AsyncPool({ concurrency: 3, signal: controller.signal });
|
||||
* for (const chunk of chunks) {
|
||||
* pool.add((signal) => fetch(chunk.url, { signal }));
|
||||
* }
|
||||
* await pool.all();
|
||||
*
|
||||
* @since 0.0.9
|
||||
*/
|
||||
export class AsyncPool {
|
||||
private limit: number;
|
||||
private activeCount: number;
|
||||
private readonly queue: CircularBuffer<PoolEntry>;
|
||||
// withResolvers result — single field replaces separate drainPromise + drainResolve
|
||||
private pending: ReturnType<typeof Promise.withResolvers<Array<PromiseSettledResult<unknown>>>> | null;
|
||||
private readonly signal: AbortSignal;
|
||||
private settled: Array<PromiseSettledResult<unknown>>;
|
||||
// Kept so the listener can be detached via dispose(), avoiding retention through a long-lived signal
|
||||
private readonly abortListener: (() => void) | null;
|
||||
// No aborted field — use this.signal.aborted directly (always in sync with the platform)
|
||||
|
||||
constructor(options: AsyncPoolOptions = {}) {
|
||||
this.limit = normalizeConcurrency(options.concurrency);
|
||||
this.activeCount = 0;
|
||||
this.queue = new CircularBuffer<PoolEntry>();
|
||||
this.pending = null;
|
||||
this.signal = options.signal ?? NEVER_ABORT_SIGNAL;
|
||||
this.settled = [];
|
||||
|
||||
if (options.signal) {
|
||||
this.abortListener = () => this.onAbort();
|
||||
options.signal.addEventListener('abort', this.abortListener, { once: true });
|
||||
}
|
||||
else {
|
||||
this.abortListener = null;
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* Detaches the pool's abort listener from the provided signal. Call this when the pool is no
|
||||
* longer needed but the signal outlives it (e.g. one long-lived controller feeding many pools),
|
||||
* otherwise the pool stays reachable through the signal's listener list and cannot be GC'd.
|
||||
*/
|
||||
dispose(): void {
|
||||
if (this.abortListener)
|
||||
this.signal.removeEventListener('abort', this.abortListener);
|
||||
}
|
||||
|
||||
get size(): number {
|
||||
return this.queue.length;
|
||||
}
|
||||
|
||||
get active(): number {
|
||||
return this.activeCount;
|
||||
}
|
||||
|
||||
get concurrency(): number {
|
||||
return this.limit;
|
||||
}
|
||||
|
||||
/**
|
||||
* Updates the concurrency limit at runtime. If increased, queued tasks are started immediately
|
||||
* to fill the newly available slots.
|
||||
*/
|
||||
set concurrency(value: number) {
|
||||
this.limit = normalizeConcurrency(value);
|
||||
this.fill();
|
||||
}
|
||||
|
||||
/**
|
||||
* Adds a task to the pool. Starts immediately if under the concurrency limit; queues otherwise.
|
||||
* The task receives the pool's AbortSignal for cooperative cancellation.
|
||||
*
|
||||
* @param {(signal: AbortSignal) => Promise<T>} task
|
||||
* @returns {Promise<T>}
|
||||
*/
|
||||
add<T>(task: (signal: AbortSignal) => Promise<T>): Promise<T> {
|
||||
// withResolvers — resolve/reject needed outside the promise for PoolEntry;
|
||||
// no executor closure, no captured variables
|
||||
const { promise, resolve, reject } = Promise.withResolvers<T>();
|
||||
if (this.signal.aborted) {
|
||||
reject(this.signal.reason);
|
||||
return promise;
|
||||
}
|
||||
const entry = { task, resolve, reject } as PoolEntry<T>;
|
||||
if (this.activeCount < this.limit) {
|
||||
this.run(entry);
|
||||
}
|
||||
else {
|
||||
this.queue.pushBack(entry);
|
||||
}
|
||||
return promise;
|
||||
}
|
||||
|
||||
/**
|
||||
* Like `Promise.all` — resolves when all tasks complete; throws `AggregateError` if any failed.
|
||||
* Multiple concurrent callers share the same underlying promise.
|
||||
*
|
||||
* @returns {Promise<void>}
|
||||
*/
|
||||
async all(): Promise<void> {
|
||||
const results = await this.waitForDrain();
|
||||
const errors: unknown[] = [];
|
||||
for (const r of results) {
|
||||
if (r.status === 'rejected')
|
||||
errors.push((r as PromiseRejectedResult).reason);
|
||||
}
|
||||
if (errors.length > 0)
|
||||
throw new AggregateError(errors, 'AsyncPool: one or more tasks failed');
|
||||
}
|
||||
|
||||
/**
|
||||
* Like `Promise.allSettled` — always resolves with the settled result of every task.
|
||||
* Multiple concurrent callers share the same underlying promise.
|
||||
*
|
||||
* @returns {Promise<Array<PromiseSettledResult<unknown>>>}
|
||||
*/
|
||||
allSettled(): Promise<Array<PromiseSettledResult<unknown>>> {
|
||||
return this.waitForDrain();
|
||||
}
|
||||
|
||||
private waitForDrain(): Promise<Array<PromiseSettledResult<unknown>>> {
|
||||
if (this.activeCount === 0 && this.queue.isEmpty) {
|
||||
// Fast path — swap settled out immediately; no copy
|
||||
const results = this.settled;
|
||||
this.settled = [];
|
||||
return Promise.resolve(results);
|
||||
}
|
||||
if (this.pending !== null)
|
||||
return this.pending.promise; // idempotent — N callers share one promise
|
||||
|
||||
this.pending = Promise.withResolvers();
|
||||
return this.pending.promise;
|
||||
}
|
||||
|
||||
private run(entry: PoolEntry): void {
|
||||
this.activeCount++;
|
||||
|
||||
let task: Promise<unknown>;
|
||||
|
||||
// A task that throws synchronously must become a rejection, otherwise the
|
||||
// exception escapes add(), the concurrency slot leaks and the pool wedges forever.
|
||||
try {
|
||||
task = Promise.resolve(entry.task(this.signal));
|
||||
}
|
||||
catch (reason) {
|
||||
this.settled.push({ status: 'rejected', reason });
|
||||
entry.reject(reason);
|
||||
this.next();
|
||||
return;
|
||||
}
|
||||
|
||||
task.then(
|
||||
(value) => {
|
||||
this.settled.push({ status: 'fulfilled', value });
|
||||
entry.resolve(value);
|
||||
this.next();
|
||||
},
|
||||
(reason) => {
|
||||
this.settled.push({ status: 'rejected', reason });
|
||||
entry.reject(reason);
|
||||
this.next();
|
||||
},
|
||||
);
|
||||
}
|
||||
|
||||
private next(): void {
|
||||
this.activeCount--;
|
||||
this.fill();
|
||||
}
|
||||
|
||||
// Central pump — fills available concurrency slots from the queue.
|
||||
// Exit point: flushes drain when queue and active are both empty.
|
||||
// Note: no abort check here — onAbort() drains the queue synchronously before
|
||||
// any microtask could call fill(), so by the time fill() runs, queue is already empty.
|
||||
private fill(): void {
|
||||
const q = this.queue;
|
||||
while (!q.isEmpty && this.activeCount < this.limit) {
|
||||
this.run(q.popFront() as PoolEntry);
|
||||
}
|
||||
if (q.isEmpty && this.activeCount === 0)
|
||||
this.flush();
|
||||
}
|
||||
|
||||
private onAbort(): void {
|
||||
const reason = this.signal.reason;
|
||||
const q = this.queue;
|
||||
while (!q.isEmpty) {
|
||||
const entry = q.popFront() as PoolEntry;
|
||||
this.settled.push({ status: 'rejected', reason });
|
||||
entry.reject(reason);
|
||||
}
|
||||
if (this.activeCount === 0)
|
||||
this.flush();
|
||||
}
|
||||
|
||||
private flush(): void {
|
||||
const drain = this.pending;
|
||||
|
||||
// No waiter yet — keep `settled` intact so a later all()/allSettled() can still
|
||||
// observe the results of every task via the waitForDrain() fast path.
|
||||
if (drain === null)
|
||||
return;
|
||||
|
||||
this.pending = null;
|
||||
// Swap — hand off current array, allocate fresh one; no element copy
|
||||
const results = this.settled;
|
||||
this.settled = [];
|
||||
drain.resolve(results);
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
|
||||
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { retry } from '.';
|
||||
|
||||
describe('retry', () => {
|
||||
@@ -12,7 +12,7 @@ describe('retry', () => {
|
||||
|
||||
it('return the result on first successful attempt', async () => {
|
||||
const successFn = vi.fn().mockResolvedValue('success');
|
||||
|
||||
|
||||
const result = await retry(successFn);
|
||||
|
||||
expect(result).toBe('success');
|
||||
@@ -20,19 +20,19 @@ describe('retry', () => {
|
||||
expect(successFn).toHaveBeenCalledWith({ count: 1, stop: expect.any(Function) });
|
||||
});
|
||||
|
||||
it('use default times value of 2', async () => {
|
||||
it('use default times value of 2', async () => {
|
||||
const failingFn = vi.fn().mockRejectedValue(new Error('Test error'));
|
||||
|
||||
|
||||
await expect(retry(failingFn)).rejects.toThrow('Test error');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('retry the specified number of times on failure', async () => {
|
||||
const failingFn = vi.fn().mockRejectedValue(new Error('Test error'));
|
||||
|
||||
|
||||
await expect(retry(failingFn, { times: 3 })).rejects.toThrow('Test error');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(3);
|
||||
expect(failingFn).toHaveBeenNthCalledWith(1, { count: 1, stop: expect.any(Function) });
|
||||
expect(failingFn).toHaveBeenNthCalledWith(2, { count: 2, stop: expect.any(Function) });
|
||||
@@ -44,7 +44,7 @@ describe('retry', () => {
|
||||
.mockRejectedValueOnce(new Error('First failure'))
|
||||
.mockRejectedValueOnce(new Error('Second failure'))
|
||||
.mockResolvedValue('success');
|
||||
|
||||
|
||||
const result = await retry(partiallyFailingFn, { times: 3 });
|
||||
|
||||
expect(result).toBe('success');
|
||||
@@ -55,24 +55,24 @@ describe('retry', () => {
|
||||
const networkError = new Error('Network failed');
|
||||
networkError.name = 'NetworkError';
|
||||
const failingFn = vi.fn().mockRejectedValue(networkError);
|
||||
|
||||
await expect(retry(failingFn, {
|
||||
|
||||
await expect(retry(failingFn, {
|
||||
times: 3,
|
||||
shouldRetry: (error) => error.name !== 'NetworkError'
|
||||
shouldRetry: error => error.name !== 'NetworkError',
|
||||
})).rejects.toThrow('Network failed');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('retry with custom shouldRetry based on count', async () => {
|
||||
const testError = new Error('Test error');
|
||||
const failingFn = vi.fn().mockRejectedValue(testError);
|
||||
|
||||
await expect(retry(failingFn, {
|
||||
|
||||
await expect(retry(failingFn, {
|
||||
times: 5,
|
||||
shouldRetry: (error, count) => count < 3 // Only retry first 2 attempts
|
||||
shouldRetry: (error, count) => count < 3, // Only retry first 2 attempts
|
||||
})).rejects.toThrow('Test error');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(3); // Initial + 2 retries
|
||||
});
|
||||
|
||||
@@ -81,17 +81,17 @@ describe('retry', () => {
|
||||
temporaryError.name = 'TemporaryError';
|
||||
const permanentError = new Error('Permanent failure');
|
||||
permanentError.name = 'PermanentError';
|
||||
|
||||
|
||||
const failingFn = vi.fn()
|
||||
.mockRejectedValueOnce(temporaryError)
|
||||
.mockRejectedValueOnce(temporaryError)
|
||||
.mockRejectedValueOnce(permanentError);
|
||||
|
||||
await expect(retry(failingFn, {
|
||||
|
||||
await expect(retry(failingFn, {
|
||||
times: 5,
|
||||
shouldRetry: (error) => error.name === 'TemporaryError'
|
||||
shouldRetry: error => error.name === 'TemporaryError',
|
||||
})).rejects.toThrow('Permanent failure');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(3);
|
||||
});
|
||||
|
||||
@@ -154,9 +154,9 @@ describe('retry', () => {
|
||||
|
||||
it('handle zero delay', async () => {
|
||||
const failingFn = vi.fn().mockRejectedValue(new Error('Test error'));
|
||||
|
||||
|
||||
await expect(retry(failingFn, { times: 3, delay: 0 })).rejects.toThrow('Test error');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(3);
|
||||
});
|
||||
|
||||
@@ -167,7 +167,7 @@ describe('retry', () => {
|
||||
}
|
||||
return `Success on attempt ${count}`;
|
||||
});
|
||||
|
||||
|
||||
const result = await retry(countingFn, { times: 3 });
|
||||
|
||||
expect(result).toBe('Success on attempt 3');
|
||||
@@ -182,15 +182,15 @@ describe('retry', () => {
|
||||
const failingFn = vi.fn()
|
||||
.mockRejectedValueOnce(firstError)
|
||||
.mockRejectedValueOnce(lastError);
|
||||
|
||||
|
||||
await expect(retry(failingFn, { times: 2 })).rejects.toThrow('Last error');
|
||||
});
|
||||
|
||||
it('handle times value of 1', async () => {
|
||||
const failingFn = vi.fn().mockRejectedValue(new Error('Test error'));
|
||||
|
||||
|
||||
await expect(retry(failingFn, { times: 1 })).rejects.toThrow('Test error');
|
||||
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
@@ -201,7 +201,7 @@ describe('retry', () => {
|
||||
}
|
||||
return 'success';
|
||||
});
|
||||
|
||||
|
||||
const result = await retry(syncFn, { times: 2 });
|
||||
|
||||
expect(result).toBe('success');
|
||||
@@ -209,45 +209,82 @@ describe('retry', () => {
|
||||
});
|
||||
|
||||
it('handle complex return types', async () => {
|
||||
const complexFn = vi.fn().mockResolvedValue({
|
||||
data: [1, 2, 3],
|
||||
const complexFn = vi.fn().mockResolvedValue({
|
||||
data: [1, 2, 3],
|
||||
status: 'ok',
|
||||
metadata: { timestamp: 123456 }
|
||||
metadata: { timestamp: 123456 },
|
||||
});
|
||||
|
||||
|
||||
const result = await retry(complexFn);
|
||||
|
||||
expect(result).toEqual({
|
||||
data: [1, 2, 3],
|
||||
status: 'ok',
|
||||
metadata: { timestamp: 123456 }
|
||||
metadata: { timestamp: 123456 },
|
||||
});
|
||||
});
|
||||
|
||||
it('stop retrying when stop function is called', async () => {
|
||||
const customError = new Error('Custom stop error');
|
||||
const stopFn = vi.fn(async ({ count, stop }: { count: number, stop: (error: any) => void }) => {
|
||||
const stopFn = vi.fn(async ({ count, stop }: { count: number; stop: (error: any) => void }) => {
|
||||
if (count === 2) {
|
||||
stop(customError);
|
||||
}
|
||||
throw new Error(`Attempt ${count} failed`);
|
||||
});
|
||||
|
||||
|
||||
await expect(retry(stopFn, { times: 5 })).rejects.toThrow('Custom stop error');
|
||||
|
||||
|
||||
expect(stopFn).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('stop retrying with undefined error when stop is called without argument', async () => {
|
||||
const stopFn = vi.fn(async ({ count, stop }: { count: number, stop: (error?: any) => void }) => {
|
||||
const stopFn = vi.fn(async ({ count, stop }: { count: number; stop: (error?: any) => void }) => {
|
||||
if (count === 2) {
|
||||
stop();
|
||||
}
|
||||
throw new Error(`Attempt ${count} failed`);
|
||||
});
|
||||
|
||||
|
||||
await expect(retry(stopFn, { times: 5 })).rejects.toBeUndefined();
|
||||
|
||||
|
||||
expect(stopFn).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('make exactly one attempt for times: 0 and reject with the real error (not null)', async () => {
|
||||
const failingFn = vi.fn().mockRejectedValue(new Error('only attempt'));
|
||||
|
||||
await expect(retry(failingFn, { times: 0 })).rejects.toThrow('only attempt');
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('make exactly one attempt for a negative times', async () => {
|
||||
const failingFn = vi.fn().mockRejectedValue(new Error('only attempt'));
|
||||
|
||||
await expect(retry(failingFn, { times: -3 })).rejects.toThrow('only attempt');
|
||||
|
||||
expect(failingFn).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('stop() on the first attempt aborts immediately with the given reason', async () => {
|
||||
const reason = new Error('early');
|
||||
const fn = vi.fn(async ({ stop }: { stop: (error: any) => void }) => {
|
||||
stop(reason);
|
||||
throw new Error('should not surface');
|
||||
});
|
||||
|
||||
await expect(retry(fn, { times: 5 })).rejects.toBe(reason);
|
||||
expect(fn).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('stop() rejects with a non-Error value verbatim', async () => {
|
||||
const fn = vi.fn(async ({ stop }: { stop: (error: any) => void }) => {
|
||||
stop('plain string reason');
|
||||
throw new Error('ignored');
|
||||
});
|
||||
|
||||
await expect(retry(fn, { times: 3 })).rejects.toBe('plain string reason');
|
||||
expect(fn).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -55,6 +55,9 @@ export async function retry<Return>(
|
||||
shouldRetry,
|
||||
} = options;
|
||||
|
||||
// Always make at least one attempt — `times < 1` would otherwise skip the loop
|
||||
// entirely and throw a bare `null`, which is impossible for callers to diagnose.
|
||||
const maxAttempts = times < 1 ? 1 : times;
|
||||
const wrappedFn = tryIt(fn);
|
||||
const delayFn = isFunction(delay) ? delay : null;
|
||||
const delayMs = delayFn ? 0 : delay as number;
|
||||
@@ -66,7 +69,7 @@ export async function retry<Return>(
|
||||
let lastError: Error | null = null;
|
||||
let count = 1;
|
||||
|
||||
while (count <= times) {
|
||||
while (count <= maxAttempts) {
|
||||
const { error, data } = await wrappedFn({ count, stop });
|
||||
|
||||
if (!error)
|
||||
@@ -82,7 +85,7 @@ export async function retry<Return>(
|
||||
count++;
|
||||
|
||||
// Don't delay after the last attempt
|
||||
if (count <= times) {
|
||||
if (count <= maxAttempts) {
|
||||
const ms = delayFn ? delayFn(count) : delayMs;
|
||||
|
||||
if (ms > 0)
|
||||
@@ -90,6 +93,7 @@ export async function retry<Return>(
|
||||
}
|
||||
}
|
||||
|
||||
// eslint-disable-next-line eslint/no-throw-literal
|
||||
// lastError is always set by the loop above (at least one attempt runs).
|
||||
// eslint-disable-next-line no-throw-literal -- rethrowing the original caught error verbatim
|
||||
throw lastError!;
|
||||
}
|
||||
|
||||
@@ -1,19 +1,38 @@
|
||||
import { describe, it, expect, vi, beforeEach } from 'vitest';
|
||||
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { sleep } from '.';
|
||||
|
||||
describe('sleep', () => {
|
||||
beforeEach(() => {
|
||||
vi.useFakeTimers({ shouldAdvanceTime: true });
|
||||
vi.useFakeTimers();
|
||||
});
|
||||
|
||||
it('delay execution by the specified amount of time', async () => {
|
||||
const start = performance.now();
|
||||
const delay = 100;
|
||||
afterEach(() => {
|
||||
vi.useRealTimers();
|
||||
});
|
||||
|
||||
await sleep(delay);
|
||||
it('resolve only after the requested delay elapses', async () => {
|
||||
let done = false;
|
||||
sleep(100).then(() => (done = true));
|
||||
|
||||
const end = performance.now();
|
||||
await vi.advanceTimersByTimeAsync(99);
|
||||
expect(done).toBe(false);
|
||||
|
||||
expect(end - start).toBeGreaterThan(delay - 5);
|
||||
await vi.advanceTimersByTimeAsync(1);
|
||||
expect(done).toBe(true);
|
||||
});
|
||||
|
||||
it('resolve with undefined', async () => {
|
||||
const promise = sleep(0);
|
||||
await vi.advanceTimersByTimeAsync(0);
|
||||
|
||||
expect(await promise).toBeUndefined();
|
||||
});
|
||||
|
||||
it('resolve on the next macrotask for a zero delay', async () => {
|
||||
let done = false;
|
||||
sleep(0).then(() => (done = true));
|
||||
|
||||
await vi.advanceTimersByTimeAsync(0);
|
||||
expect(done).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -0,0 +1,37 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { tryIt } from '.';
|
||||
|
||||
describe('tryIt', () => {
|
||||
it('wraps async returns in a Promise of the discriminated union', () => {
|
||||
const wrapped = tryIt(async (n: number) => n * 2);
|
||||
|
||||
expectTypeOf(wrapped(2)).toEqualTypeOf<
|
||||
Promise<{ error: Error; data: undefined } | { error: undefined; data: number }>
|
||||
>();
|
||||
});
|
||||
|
||||
it('keeps sync returns synchronous', () => {
|
||||
const wrapped = tryIt((n: number) => n * 2);
|
||||
|
||||
expectTypeOf(wrapped(2)).toEqualTypeOf<
|
||||
{ error: Error; data: undefined } | { error: undefined; data: number }
|
||||
>();
|
||||
});
|
||||
|
||||
it('unwraps Awaited for a promise-returning function', () => {
|
||||
const wrapped = tryIt((n: number) => Promise.resolve(`${n}`));
|
||||
|
||||
expectTypeOf(wrapped(1)).toEqualTypeOf<
|
||||
Promise<{ error: Error; data: undefined } | { error: undefined; data: string }>
|
||||
>();
|
||||
});
|
||||
|
||||
it('narrows data when error is checked', () => {
|
||||
const result = tryIt((n: number) => n)(1);
|
||||
|
||||
if (result.error === undefined)
|
||||
expectTypeOf(result.data).toEqualTypeOf<number>();
|
||||
else
|
||||
expectTypeOf(result.data).toEqualTypeOf<undefined>();
|
||||
});
|
||||
});
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { tryIt } from '.';
|
||||
|
||||
describe('tryIt', () => {
|
||||
@@ -68,4 +68,33 @@ describe('tryIt', () => {
|
||||
expect(error?.message).toBe('Test error');
|
||||
expect(data).toBeUndefined();
|
||||
});
|
||||
|
||||
it('capture a rejected thenable (non-native PromiseLike)', async () => {
|
||||
const thenableFn = () => ({
|
||||
// eslint-disable-next-line unicorn/no-thenable -- intentionally exercising a custom thenable
|
||||
then(_resolve: (v: number) => void, reject: (e: unknown) => void) {
|
||||
reject(new Error('thenable error'));
|
||||
},
|
||||
});
|
||||
|
||||
const { error, data } = await tryIt(thenableFn)();
|
||||
|
||||
expect(error).toBeInstanceOf(Error);
|
||||
expect((error as Error).message).toBe('thenable error');
|
||||
expect(data).toBeUndefined();
|
||||
});
|
||||
|
||||
it('resolve a fulfilled thenable to its data', async () => {
|
||||
const thenableFn = () => ({
|
||||
// eslint-disable-next-line unicorn/no-thenable -- intentionally exercising a custom thenable
|
||||
then(resolve: (v: number) => void) {
|
||||
resolve(42);
|
||||
},
|
||||
});
|
||||
|
||||
const { error, data } = await tryIt(thenableFn)();
|
||||
|
||||
expect(error).toBeUndefined();
|
||||
expect(data).toBe(42);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,11 +1,19 @@
|
||||
import { isPromise } from '../../types';
|
||||
|
||||
export type TryItReturn<Return> = Return extends Promise<any>
|
||||
export type TryItReturn<Return> = Return extends PromiseLike<any>
|
||||
? Promise<{ error: Error; data: undefined } | { error: undefined; data: Awaited<Return> }>
|
||||
: { error: Error; data: undefined } | { error: undefined; data: Return };
|
||||
|
||||
function onResolve(data: any) { return { error: undefined, data }; }
|
||||
function onReject(error: any) { return { error, data: undefined }; }
|
||||
function isThenable(value: unknown): value is PromiseLike<unknown> {
|
||||
return value !== null && (typeof value === 'object' || typeof value === 'function')
|
||||
&& typeof (value as PromiseLike<unknown>).then === 'function';
|
||||
}
|
||||
|
||||
function onResolve(data: any) {
|
||||
return { error: undefined, data };
|
||||
}
|
||||
|
||||
function onReject(error: any) {
|
||||
return { error, data: undefined };
|
||||
}
|
||||
|
||||
/**
|
||||
* @name tryIt
|
||||
@@ -31,11 +39,14 @@ export function tryIt<Args extends any[], Return>(
|
||||
try {
|
||||
const result = fn(...args);
|
||||
|
||||
if (isPromise(result))
|
||||
return result.then(onResolve, onReject) as TryItReturn<Return>;
|
||||
// Handle any thenable (native Promise, async fn, or custom PromiseLike), so a
|
||||
// rejected thenable is captured as { error } instead of escaping as raw data.
|
||||
if (isThenable(result))
|
||||
return Promise.resolve(result).then(onResolve, onReject) as TryItReturn<Return>;
|
||||
|
||||
return { error: undefined, data: result } as TryItReturn<Return>;
|
||||
} catch (error) {
|
||||
}
|
||||
catch (error) {
|
||||
return { error, data: undefined } as TryItReturn<Return>;
|
||||
}
|
||||
};
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { flagsGenerator } from '.';
|
||||
|
||||
describe('flagsGenerator', () => {
|
||||
@@ -23,4 +23,17 @@ describe('flagsGenerator', () => {
|
||||
|
||||
expect(() => generateFlag()).toThrow(new RangeError('Cannot create more than 31 flags'));
|
||||
});
|
||||
|
||||
it('produce 31 distinct, orthogonal powers of two up to 2^30', () => {
|
||||
const generateFlag = flagsGenerator();
|
||||
const flags = Array.from({ length: 31 }, () => generateFlag());
|
||||
|
||||
expect(new Set(flags).size).toBe(31);
|
||||
flags.forEach((flag, i) => {
|
||||
expect(flag).toBe(2 ** i);
|
||||
expect(flag & (flag - 1)).toBe(0); // exactly one bit set
|
||||
});
|
||||
|
||||
expect(flags.at(-1)).toBe(2 ** 30);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,5 +1,5 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { and, or, not, has, is, unset, toggle } from '.';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { and, has, is, not, or, toggle, unset } from '.';
|
||||
|
||||
describe('flagsAnd', () => {
|
||||
it('no effect on zero flags', () => {
|
||||
@@ -61,6 +61,15 @@ describe('flagsHas', () => {
|
||||
|
||||
expect(result).toBe(false);
|
||||
});
|
||||
|
||||
it('require ALL queried bits, not just any (partial overlap is false)', () => {
|
||||
// 0b1000 is set but 0b0100 is not — partial overlap must be false
|
||||
expect(has(0b1010, 0b1100)).toBe(false);
|
||||
// both bits present
|
||||
expect(has(0b1110, 0b1100)).toBe(true);
|
||||
// querying zero bits is vacuously true
|
||||
expect(has(0b1010, 0b0000)).toBe(true);
|
||||
});
|
||||
});
|
||||
|
||||
describe('flagsIs', () => {
|
||||
|
||||
@@ -29,7 +29,7 @@ export function or(...flags: number[]) {
|
||||
/**
|
||||
* @name not
|
||||
* @category Bits
|
||||
* @description Function to combine multiple flags using the XOR operator
|
||||
* @description Function to apply the bitwise NOT (complement) operator to a flag
|
||||
*
|
||||
* @param {number} flag - The flag to apply the NOT operator to
|
||||
* @returns {number} The result of the NOT operator
|
||||
|
||||
@@ -1 +1,3 @@
|
||||
export * from './flags';
|
||||
export * from './helpers';
|
||||
export * from './vector';
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { BitVector } from '.';
|
||||
|
||||
describe('BitVector', () => {
|
||||
@@ -54,10 +54,76 @@ describe('BitVector', () => {
|
||||
expect(bitVector.previousBit(0)).toBe(-1);
|
||||
});
|
||||
|
||||
it('throw RangeError when previousBit is called with an unreachable value', () => {
|
||||
it('clamp an out-of-range start index and return the previous set bit', () => {
|
||||
const bitVector = new BitVector(16);
|
||||
bitVector.setBit(5);
|
||||
|
||||
expect(() => bitVector.previousBit(24)).toThrow(new RangeError('Unreachable value'));
|
||||
expect(bitVector.previousBit(24)).toBe(5);
|
||||
});
|
||||
|
||||
it('return -1 from previousBit on an empty out-of-range query', () => {
|
||||
const bitVector = new BitVector(16);
|
||||
|
||||
expect(bitVector.previousBit(24)).toBe(-1);
|
||||
});
|
||||
|
||||
it('toggle bits correctly', () => {
|
||||
const bitVector = new BitVector(16);
|
||||
|
||||
bitVector.toggleBit(7);
|
||||
expect(bitVector.getBit(7)).toBe(true);
|
||||
|
||||
bitVector.toggleBit(7);
|
||||
expect(bitVector.getBit(7)).toBe(false);
|
||||
});
|
||||
|
||||
it('find the next bit correctly', () => {
|
||||
const bitVector = new BitVector(100);
|
||||
const indices = [0, 1, 14, 15, 63, 64, 65, 66, 88, 99];
|
||||
const result = [];
|
||||
indices.forEach(index => bitVector.setBit(index));
|
||||
|
||||
for (let i = bitVector.nextBit(-1); i !== -1; i = bitVector.nextBit(i)) {
|
||||
result.push(i);
|
||||
}
|
||||
|
||||
expect(result).toEqual(indices);
|
||||
});
|
||||
|
||||
it('return -1 when no next bit is found', () => {
|
||||
const bitVector = new BitVector(16);
|
||||
|
||||
expect(bitVector.nextBit(0)).toBe(-1);
|
||||
expect(bitVector.nextBit(15)).toBe(-1);
|
||||
});
|
||||
|
||||
it('count the number of set bits', () => {
|
||||
const bitVector = new BitVector(100);
|
||||
|
||||
expect(bitVector.count()).toBe(0);
|
||||
|
||||
[0, 5, 63, 64, 99].forEach(index => bitVector.setBit(index));
|
||||
|
||||
expect(bitVector.count()).toBe(5);
|
||||
|
||||
bitVector.clearBit(5);
|
||||
|
||||
expect(bitVector.count()).toBe(4);
|
||||
});
|
||||
|
||||
it('tolerate out-of-bounds writes without crashing or corrupting in-range bits', () => {
|
||||
const bitVector = new BitVector(16);
|
||||
bitVector.setBit(3);
|
||||
|
||||
expect(() => {
|
||||
bitVector.setBit(1000);
|
||||
bitVector.clearBit(1000);
|
||||
bitVector.toggleBit(1000);
|
||||
}).not.toThrow();
|
||||
|
||||
// out-of-range reads are false; in-range state is intact
|
||||
expect(bitVector.getBit(1000)).toBe(false);
|
||||
expect(bitVector.getBit(3)).toBe(true);
|
||||
expect(bitVector.count()).toBe(1);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -2,7 +2,10 @@ export interface BitVectorLike {
|
||||
getBit(index: number): boolean;
|
||||
setBit(index: number): void;
|
||||
clearBit(index: number): void;
|
||||
toggleBit(index: number): void;
|
||||
previousBit(index: number): number;
|
||||
nextBit(index: number): number;
|
||||
count(): number;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -30,7 +33,18 @@ export class BitVector extends Uint8Array implements BitVectorLike {
|
||||
this[index >> 3]! &= ~(1 << (index & 7));
|
||||
}
|
||||
|
||||
toggleBit(index: number): void {
|
||||
this[index >> 3]! ^= 1 << (index & 7);
|
||||
}
|
||||
|
||||
previousBit(index: number): number {
|
||||
// Clamp an out-of-range start to the vector's bit length so a query past the end
|
||||
// returns the last set bit (or -1) instead of falling through to the invariant throw.
|
||||
const totalBits = this.length << 3;
|
||||
|
||||
if (index > totalBits)
|
||||
index = totalBits;
|
||||
|
||||
while (index !== ((index >> 3) << 3)) {
|
||||
--index;
|
||||
|
||||
@@ -58,4 +72,61 @@ export class BitVector extends Uint8Array implements BitVectorLike {
|
||||
|
||||
throw new RangeError('Unreachable value');
|
||||
}
|
||||
|
||||
nextBit(index: number): number {
|
||||
const totalBits = this.length << 3;
|
||||
|
||||
let i = index + 1;
|
||||
|
||||
if (i < 0)
|
||||
i = 0;
|
||||
|
||||
// Finish scanning the remainder of the starting byte.
|
||||
while (i < totalBits && (i & 7) !== 0) {
|
||||
if (this.getBit(i))
|
||||
return i;
|
||||
|
||||
++i;
|
||||
}
|
||||
|
||||
// Skip over fully-empty bytes.
|
||||
let byteIndex = i >> 3;
|
||||
|
||||
while (byteIndex < this.length && this[byteIndex] === 0)
|
||||
++byteIndex;
|
||||
|
||||
if (byteIndex >= this.length)
|
||||
return -1;
|
||||
|
||||
i = byteIndex << 3;
|
||||
|
||||
const end = i + 8;
|
||||
|
||||
while (i < end) {
|
||||
if (this.getBit(i))
|
||||
return i;
|
||||
|
||||
++i;
|
||||
}
|
||||
|
||||
throw new RangeError('Unreachable value');
|
||||
}
|
||||
|
||||
count(): number {
|
||||
let total = 0;
|
||||
const len = this.length;
|
||||
|
||||
// Indexed loop — the typed-array iterator protocol (for...of) is ~3.5x slower here.
|
||||
for (let i = 0; i < len; i++) {
|
||||
// Brian Kernighan's algorithm: iterate once per set bit.
|
||||
let byte = this[i]!;
|
||||
|
||||
while (byte !== 0) {
|
||||
byte &= byte - 1;
|
||||
++total;
|
||||
}
|
||||
}
|
||||
|
||||
return total;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -0,0 +1,53 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { get } from '.';
|
||||
import type { Get } from '.';
|
||||
|
||||
describe('get', () => {
|
||||
describe('runtime return type', () => {
|
||||
it('infer a nested object value', () => {
|
||||
expectTypeOf(get({ user: { name: 'John' } }, 'user.name')).toEqualTypeOf<string | undefined>();
|
||||
});
|
||||
|
||||
it('infer a value behind an array index', () => {
|
||||
expectTypeOf(get({ items: [{ id: 1 }] }, 'items.0.id')).toEqualTypeOf<number | undefined>();
|
||||
});
|
||||
|
||||
it('infer an array element', () => {
|
||||
expectTypeOf(get({ items: [{ id: 1 }] }, 'items.0')).toEqualTypeOf<{ id: number } | undefined>();
|
||||
});
|
||||
|
||||
it('infer the element type of a root array', () => {
|
||||
expectTypeOf(get(['a', 'b', 'c'], '0')).toEqualTypeOf<string | undefined>();
|
||||
});
|
||||
|
||||
it('narrow to undefined when descending into a primitive', () => {
|
||||
expectTypeOf(get({ a: 1 }, 'a.b.c')).toEqualTypeOf<undefined>();
|
||||
});
|
||||
|
||||
it('narrow to undefined for a missing key', () => {
|
||||
expectTypeOf(get({ user: { name: 'John' } }, 'user.age')).toEqualTypeOf<undefined>();
|
||||
});
|
||||
});
|
||||
|
||||
describe('Get', () => {
|
||||
it('resolve a simple object path', () => {
|
||||
expectTypeOf<Get<{ user: { name: string } }, 'user.name'>>().toEqualTypeOf<string>();
|
||||
});
|
||||
|
||||
it('resolve a path through an array index (general arrays widen with undefined)', () => {
|
||||
expectTypeOf<Get<{ list: number[] }, 'list.0'>>().toEqualTypeOf<number | undefined>();
|
||||
});
|
||||
|
||||
it('resolve an exact element type from a tuple', () => {
|
||||
expectTypeOf<Get<{ pair: [string, number] }, 'pair.1'>>().toEqualTypeOf<number>();
|
||||
});
|
||||
|
||||
it('resolve a deeply nested path', () => {
|
||||
expectTypeOf<Get<{ a: { b: { c: boolean } } }, 'a.b.c'>>().toEqualTypeOf<boolean>();
|
||||
});
|
||||
|
||||
it('resolve to never for a missing key', () => {
|
||||
expectTypeOf<Get<{ a: number }, 'b'>>().toEqualTypeOf<never>();
|
||||
});
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,61 @@
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { get } from '.';
|
||||
|
||||
describe('get', () => {
|
||||
it('read a top-level property', () => {
|
||||
expect(get({ name: 'John' }, 'name')).toBe('John');
|
||||
});
|
||||
|
||||
it('read a nested object property', () => {
|
||||
expect(get({ user: { name: 'John' } }, 'user.name')).toBe('John');
|
||||
});
|
||||
|
||||
it('read a value through an array index', () => {
|
||||
expect(get({ items: [{ id: 1 }, { id: 2 }] }, 'items.1.id')).toBe(2);
|
||||
});
|
||||
|
||||
it('read deeply nested values', () => {
|
||||
const source = { a: { b: { c: { d: 42 } } } };
|
||||
|
||||
expect(get(source, 'a.b.c.d')).toBe(42);
|
||||
});
|
||||
|
||||
it('return undefined for a missing leaf', () => {
|
||||
expect(get({ user: { name: 'John' } }, 'user.age')).toBeUndefined();
|
||||
});
|
||||
|
||||
it('return undefined when traversing through a missing branch', () => {
|
||||
expect(get({ a: 1 }, 'a.b.c')).toBeUndefined();
|
||||
});
|
||||
|
||||
it('return undefined when traversing through null/undefined', () => {
|
||||
expect(get({ user: null }, 'user.name')).toBeUndefined();
|
||||
expect(get({ user: undefined }, 'user.name')).toBeUndefined();
|
||||
});
|
||||
|
||||
it('preserve falsy values', () => {
|
||||
expect(get({ count: 0 }, 'count')).toBe(0);
|
||||
expect(get({ flag: false }, 'flag')).toBe(false);
|
||||
expect(get({ value: '' }, 'value')).toBe('');
|
||||
});
|
||||
|
||||
it('work on arrays as the root collection', () => {
|
||||
expect(get(['a', 'b', 'c'], '2')).toBe('c');
|
||||
});
|
||||
|
||||
it('return the object itself for an empty path', () => {
|
||||
const obj = { a: 1 };
|
||||
|
||||
expect(get(obj, '')).toBeUndefined();
|
||||
});
|
||||
|
||||
it('resolve own properties (inherited keys are reachable via the prototype chain)', () => {
|
||||
const proto = { inherited: 'from-proto' };
|
||||
const obj = Object.create(proto) as { inherited: string; own?: number };
|
||||
obj.own = 1;
|
||||
|
||||
expect(get(obj, 'own')).toBe(1);
|
||||
// documents current behavior: bracket access does walk the prototype chain
|
||||
expect(get(obj, 'inherited')).toBe('from-proto');
|
||||
});
|
||||
});
|
||||
@@ -27,8 +27,40 @@ export type ExtractFromCollection<O, K>
|
||||
: never
|
||||
: never;
|
||||
|
||||
type Get<O, K> = ExtractFromCollection<O, Path<K>>;
|
||||
export type Get<O, K> = ExtractFromCollection<O, Path<K>>;
|
||||
|
||||
export function get<O extends Collection, K extends string>(obj: O, path: K) {
|
||||
return path.split('.').reduce((acc, key) => (acc as any)?.[key], obj) as Get<O, K> | undefined;
|
||||
/**
|
||||
* @name get
|
||||
* @category Collections
|
||||
* @description Safely read a deeply nested value from a collection by a dot-separated path
|
||||
*
|
||||
* @param {Collection} obj - The source object or array
|
||||
* @param {string} path - Dot-separated path, e.g. `'user.addresses.0.street'`
|
||||
* @returns {Get<O, K> | undefined} The resolved value, or `undefined` if any segment is missing
|
||||
*
|
||||
* @example
|
||||
* get({ user: { name: 'John' } }, 'user.name'); // 'John'
|
||||
* get({ items: [{ id: 1 }] }, 'items.0.id'); // 1
|
||||
* get({ a: 1 }, 'a.b.c'); // undefined
|
||||
*
|
||||
* @since 0.0.4
|
||||
*/
|
||||
export function get<O extends Collection, K extends string>(obj: O, path: K): Get<O, K> | undefined {
|
||||
let value: any = obj;
|
||||
let start = 0;
|
||||
|
||||
// Walk the path without allocating an intermediate array of segments.
|
||||
for (let i = 0, len = path.length; i <= len; i++) {
|
||||
// Split on '.' (char code 46) or the end of the string.
|
||||
if (i !== len && path.charCodeAt(i) !== 46)
|
||||
continue;
|
||||
|
||||
if (value === null || value === undefined)
|
||||
return undefined;
|
||||
|
||||
value = value[path.slice(start, i)];
|
||||
start = i + 1;
|
||||
}
|
||||
|
||||
return value;
|
||||
}
|
||||
|
||||
@@ -0,0 +1,18 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { compose } from '.';
|
||||
|
||||
describe('compose', () => {
|
||||
it('infers the final return type through the chain', () => {
|
||||
const fn = compose((s: string) => s.length > 0, (n: number) => `${n}`, (n: number) => n + 1);
|
||||
|
||||
expectTypeOf(fn).parameters.toEqualTypeOf<[number]>();
|
||||
expectTypeOf(fn).returns.toEqualTypeOf<boolean>();
|
||||
});
|
||||
|
||||
it('keeps the variadic parameters of the last function', () => {
|
||||
const fn = compose((n: number) => `${n}`, (a: number, b: number) => a + b);
|
||||
|
||||
expectTypeOf(fn).parameters.toEqualTypeOf<[number, number]>();
|
||||
expectTypeOf(fn).returns.toEqualTypeOf<string>();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,41 @@
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { compose } from '.';
|
||||
|
||||
describe('compose', () => {
|
||||
it('apply functions right-to-left', () => {
|
||||
const calc = compose((n: number) => `= ${n}`, (n: number) => n * 2, (n: number) => n + 1);
|
||||
|
||||
expect(calc(3)).toBe('= 8');
|
||||
});
|
||||
|
||||
it('pass multiple arguments to the last function', () => {
|
||||
const calc = compose((n: number) => n * 10, (a: number, b: number) => a + b);
|
||||
|
||||
expect(calc(2, 3)).toBe(50);
|
||||
});
|
||||
|
||||
it('support a single function', () => {
|
||||
const inc = compose((n: number) => n + 1);
|
||||
|
||||
expect(inc(1)).toBe(2);
|
||||
});
|
||||
|
||||
it('mirror pipe with reversed arguments', () => {
|
||||
const f = (n: number) => n + 1;
|
||||
const g = (n: number) => n * 2;
|
||||
|
||||
expect(compose(g, f)(3)).toBe(8);
|
||||
});
|
||||
|
||||
it('forward this to the right-most function', () => {
|
||||
const calc = compose((n: number) => n * 2, function (this: { base: number }, n: number) {
|
||||
return this.base + n;
|
||||
});
|
||||
|
||||
expect(calc.call({ base: 10 }, 5)).toBe(30);
|
||||
});
|
||||
|
||||
it('return the input unchanged with no functions', () => {
|
||||
expect((compose as unknown as (...fns: never[]) => (x: number) => number)()(42)).toBe(42);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,38 @@
|
||||
import type { AnyFunction } from '../../types';
|
||||
|
||||
/**
|
||||
* @name compose
|
||||
* @category Functions
|
||||
* @description Composes functions right-to-left: `compose(f, g)(x)` is `f(g(x))`
|
||||
*
|
||||
* @param {...Function} fns - The functions to compose; the last may take any number of arguments
|
||||
* @returns {Function} A function that runs the input through every function from last to first
|
||||
*
|
||||
* @example
|
||||
* const calc = compose((n: number) => `= ${n}`, (n: number) => n * 2, (n: number) => n + 1);
|
||||
* calc(3); // '= 8'
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function compose<A extends any[], B>(ab: (...a: A) => B): (...a: A) => B;
|
||||
export function compose<A extends any[], B, C>(bc: (b: B) => C, ab: (...a: A) => B): (...a: A) => C;
|
||||
export function compose<A extends any[], B, C, D>(cd: (c: C) => D, bc: (b: B) => C, ab: (...a: A) => B): (...a: A) => D;
|
||||
export function compose<A extends any[], B, C, D, E>(de: (d: D) => E, cd: (c: C) => D, bc: (b: B) => C, ab: (...a: A) => B): (...a: A) => E;
|
||||
export function compose<A extends any[], B, C, D, E, F>(ef: (e: E) => F, de: (d: D) => E, cd: (c: C) => D, bc: (b: B) => C, ab: (...a: A) => B): (...a: A) => F;
|
||||
export function compose<A extends any[], B, C, D, E, F, G>(fg: (f: F) => G, ef: (e: E) => F, de: (d: D) => E, cd: (c: C) => D, bc: (b: B) => C, ab: (...a: A) => B): (...a: A) => G;
|
||||
export function compose<A extends any[], B, C, D, E, F, G, H>(gh: (g: G) => H, fg: (f: F) => G, ef: (e: E) => F, de: (d: D) => E, cd: (c: C) => D, bc: (b: B) => C, ab: (...a: A) => B): (...a: A) => H;
|
||||
export function compose(...fns: AnyFunction[]): AnyFunction {
|
||||
return function (this: unknown, ...args: any[]) {
|
||||
const last = fns.length - 1;
|
||||
|
||||
if (last < 0)
|
||||
return args[0];
|
||||
|
||||
let result = fns[last]!.apply(this, args);
|
||||
|
||||
for (let i = last - 1; i >= 0; i--)
|
||||
result = fns[i]!.call(this, result);
|
||||
|
||||
return result;
|
||||
};
|
||||
}
|
||||
@@ -0,0 +1,179 @@
|
||||
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { debounce } from '.';
|
||||
|
||||
describe('debounce', () => {
|
||||
beforeEach(() => vi.useFakeTimers());
|
||||
afterEach(() => vi.useRealTimers());
|
||||
|
||||
it('delay invocation until wait elapses since the last call', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
debounced();
|
||||
debounced();
|
||||
debounced();
|
||||
expect(spy).not.toHaveBeenCalled();
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('reset the timer on every call', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
debounced();
|
||||
vi.advanceTimersByTime(60);
|
||||
debounced();
|
||||
vi.advanceTimersByTime(60);
|
||||
expect(spy).not.toHaveBeenCalled();
|
||||
|
||||
vi.advanceTimersByTime(40);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('invoke on the leading edge', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100, { leading: true, trailing: false });
|
||||
|
||||
debounced();
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
debounced();
|
||||
debounced();
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('forward the latest arguments and this', () => {
|
||||
const spy = vi.fn(function (this: { base: number }, n: number) {
|
||||
return this.base + n;
|
||||
});
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
debounced.call({ base: 10 }, 1);
|
||||
debounced.call({ base: 10 }, 2);
|
||||
vi.advanceTimersByTime(100);
|
||||
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
expect(spy).toHaveBeenLastCalledWith(2);
|
||||
expect(spy.mock.results[0]!.value).toBe(12);
|
||||
});
|
||||
|
||||
it('cancel a pending invocation', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
debounced();
|
||||
expect(debounced.pending()).toBe(true);
|
||||
|
||||
debounced.cancel();
|
||||
expect(debounced.pending()).toBe(false);
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).not.toHaveBeenCalled();
|
||||
});
|
||||
|
||||
it('flush a pending invocation immediately and return its result', () => {
|
||||
const spy = vi.fn((n: number) => n * 2);
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
debounced(5);
|
||||
expect(debounced.flush()).toBe(10);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('resolves the wait from a getter on each call', () => {
|
||||
const spy = vi.fn();
|
||||
let wait = 100;
|
||||
const debounced = debounce(spy, () => wait);
|
||||
|
||||
debounced();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
wait = 200;
|
||||
debounced();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1); // not yet, window is now 200
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('forces invocation after maxWait under sustained calls', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100, { maxWait: 250 });
|
||||
|
||||
// Keep resetting the 100ms timer every 80ms; without maxWait it would never fire.
|
||||
debounced();
|
||||
vi.advanceTimersByTime(80);
|
||||
debounced();
|
||||
vi.advanceTimersByTime(80);
|
||||
debounced();
|
||||
vi.advanceTimersByTime(80);
|
||||
expect(spy).not.toHaveBeenCalled();
|
||||
|
||||
// 240ms elapsed; at 250ms the maxWait fires.
|
||||
vi.advanceTimersByTime(10);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('pending() is false after a maxWait-forced invocation', () => {
|
||||
const debounced = debounce(vi.fn(), 100, { maxWait: 150 });
|
||||
debounced();
|
||||
vi.advanceTimersByTime(150);
|
||||
expect(debounced.pending()).toBe(false);
|
||||
});
|
||||
|
||||
it('leading + trailing fires on both edges for a burst but once for a lone call', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100, { leading: true, trailing: true });
|
||||
|
||||
debounced();
|
||||
expect(spy).toHaveBeenCalledTimes(1); // leading
|
||||
debounced();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(2); // trailing
|
||||
|
||||
spy.mockClear();
|
||||
debounced(); // isolated call
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1); // leading only, no trailing double-fire
|
||||
});
|
||||
|
||||
it('re-arm after a trailing fire', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
debounced();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
debounced();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('flush() and cancel() are no-ops when nothing is pending', () => {
|
||||
const spy = vi.fn();
|
||||
const debounced = debounce(spy, 100);
|
||||
|
||||
expect(debounced.flush()).toBeUndefined();
|
||||
debounced.cancel();
|
||||
|
||||
expect(spy).not.toHaveBeenCalled();
|
||||
expect(debounced.pending()).toBe(false);
|
||||
});
|
||||
|
||||
it('pending() is false during the window when trailing is disabled', () => {
|
||||
const debounced = debounce(vi.fn(), 100, { leading: true, trailing: false });
|
||||
|
||||
debounced();
|
||||
expect(debounced.pending()).toBe(false);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,130 @@
|
||||
import type { AnyFunction } from '../../types';
|
||||
|
||||
export interface DebounceOptions {
|
||||
/** Invoke on the leading edge of the timeout. Default `false`. */
|
||||
leading?: boolean;
|
||||
/** Invoke on the trailing edge of the timeout. Default `true`. */
|
||||
trailing?: boolean;
|
||||
/**
|
||||
* The maximum time `fn` is allowed to be delayed before it is forcibly
|
||||
* invoked, even while calls keep arriving. Accepts a number or a getter
|
||||
* resolved lazily. When omitted there is no upper bound.
|
||||
*/
|
||||
maxWait?: number | (() => number);
|
||||
}
|
||||
|
||||
export interface DebouncedFunction<T extends AnyFunction> {
|
||||
(this: ThisParameterType<T>, ...args: Parameters<T>): void;
|
||||
/** Cancel a pending invocation without calling the function. */
|
||||
cancel: () => void;
|
||||
/** Immediately invoke a pending call (if any) and return its result. */
|
||||
flush: () => ReturnType<T> | undefined;
|
||||
/** Whether an invocation is currently scheduled. */
|
||||
pending: () => boolean;
|
||||
}
|
||||
|
||||
/**
|
||||
* @name debounce
|
||||
* @category Functions
|
||||
* @description Delays invoking a function until `wait` ms have elapsed since the last call
|
||||
*
|
||||
* @param {Function} fn - The function to debounce
|
||||
* @param {number | (() => number)} wait - Milliseconds to wait, or a getter resolved lazily on each call (useful for reactive delays)
|
||||
* @param {DebounceOptions} [options] - Leading/trailing edge behavior and `maxWait`
|
||||
* @returns {DebouncedFunction} The debounced function with `cancel()`, `flush()` and `pending()`
|
||||
*
|
||||
* @example
|
||||
* const onResize = debounce(() => layout(), 200);
|
||||
* window.addEventListener('resize', onResize);
|
||||
* onResize.cancel();
|
||||
*
|
||||
* @example
|
||||
* // Reactive delay + a guaranteed call at least every 1000ms under sustained input
|
||||
* const save = debounce(persist, () => delayRef.value, { maxWait: 1000 });
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function debounce<T extends AnyFunction>(
|
||||
fn: T,
|
||||
wait: number | (() => number),
|
||||
options: DebounceOptions = {},
|
||||
): DebouncedFunction<T> {
|
||||
const { leading = false, trailing = true, maxWait } = options;
|
||||
const resolveWait = typeof wait === 'function' ? wait : () => wait;
|
||||
const resolveMaxWait = maxWait === undefined
|
||||
? undefined
|
||||
: (typeof maxWait === 'function' ? maxWait : () => maxWait);
|
||||
|
||||
let timer: ReturnType<typeof setTimeout> | undefined;
|
||||
let maxTimer: ReturnType<typeof setTimeout> | undefined;
|
||||
let pending: (() => ReturnType<T>) | undefined;
|
||||
let result: ReturnType<T> | undefined;
|
||||
|
||||
function invoke() {
|
||||
if (pending === undefined)
|
||||
return;
|
||||
|
||||
result = pending();
|
||||
pending = undefined;
|
||||
}
|
||||
|
||||
function clearTimers() {
|
||||
if (timer !== undefined) {
|
||||
clearTimeout(timer);
|
||||
timer = undefined;
|
||||
}
|
||||
|
||||
if (maxTimer !== undefined) {
|
||||
clearTimeout(maxTimer);
|
||||
maxTimer = undefined;
|
||||
}
|
||||
}
|
||||
|
||||
const debounced = function (this: ThisParameterType<T>, ...args: Parameters<T>) {
|
||||
// The arrow captures the call-time `this` lexically, no aliasing needed.
|
||||
pending = () => fn.apply(this, args) as ReturnType<T>;
|
||||
|
||||
const callLeading = leading && timer === undefined && maxTimer === undefined;
|
||||
|
||||
if (timer !== undefined)
|
||||
clearTimeout(timer);
|
||||
|
||||
timer = setTimeout(() => {
|
||||
clearTimers();
|
||||
|
||||
if (trailing)
|
||||
invoke();
|
||||
}, resolveWait());
|
||||
|
||||
// maxWait: guarantee an invocation within maxWait of the burst's first call.
|
||||
if (resolveMaxWait !== undefined && maxTimer === undefined) {
|
||||
maxTimer = setTimeout(() => {
|
||||
clearTimers();
|
||||
invoke();
|
||||
}, resolveMaxWait());
|
||||
}
|
||||
|
||||
if (callLeading)
|
||||
invoke();
|
||||
} as DebouncedFunction<T>;
|
||||
|
||||
debounced.cancel = () => {
|
||||
clearTimers();
|
||||
pending = undefined;
|
||||
};
|
||||
|
||||
debounced.flush = () => {
|
||||
if (timer !== undefined || maxTimer !== undefined) {
|
||||
clearTimers();
|
||||
invoke();
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
// True only when an invocation will actually occur: a maxWait flush is always honored,
|
||||
// but the trailing-edge timer fires fn only when `trailing` is enabled.
|
||||
debounced.pending = () => maxTimer !== undefined || (trailing && timer !== undefined);
|
||||
|
||||
return debounced;
|
||||
}
|
||||
@@ -0,0 +1,6 @@
|
||||
export * from './compose';
|
||||
export * from './debounce';
|
||||
export * from './memoize';
|
||||
export * from './once';
|
||||
export * from './pipe';
|
||||
export * from './throttle';
|
||||
@@ -0,0 +1,71 @@
|
||||
import { describe, expect, it, vi } from 'vitest';
|
||||
import { memoize } from '.';
|
||||
|
||||
describe('memoize', () => {
|
||||
it('cache results by the first argument', () => {
|
||||
const spy = vi.fn((n: number) => n * 2);
|
||||
const memoized = memoize(spy);
|
||||
|
||||
expect(memoized(2)).toBe(4);
|
||||
expect(memoized(2)).toBe(4);
|
||||
expect(memoized(3)).toBe(6);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('use a custom resolver for the cache key', () => {
|
||||
const spy = vi.fn((a: number, b: number) => a + b);
|
||||
const memoized = memoize(spy, (a, b) => `${a},${b}`);
|
||||
|
||||
expect(memoized(1, 2)).toBe(3);
|
||||
expect(memoized(1, 2)).toBe(3);
|
||||
expect(memoized(2, 1)).toBe(3);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('cache falsy results', () => {
|
||||
const spy = vi.fn((_n: number) => 0);
|
||||
const memoized = memoize(spy);
|
||||
|
||||
expect(memoized(1)).toBe(0);
|
||||
expect(memoized(1)).toBe(0);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('expose the cache and a clear() method', () => {
|
||||
const memoized = memoize((n: number) => n * 2);
|
||||
|
||||
memoized(2);
|
||||
expect(memoized.cache.size).toBe(1);
|
||||
expect(memoized.cache.get(2)).toBe(4);
|
||||
|
||||
memoized.clear();
|
||||
expect(memoized.cache.size).toBe(0);
|
||||
});
|
||||
|
||||
it('preserve this', () => {
|
||||
const memoized = memoize(function (this: { base: number }, n: number) {
|
||||
return this.base + n;
|
||||
});
|
||||
|
||||
expect(memoized.call({ base: 10 }, 5)).toBe(15);
|
||||
});
|
||||
|
||||
it('key only on the first argument by default (documented multi-arg footgun)', () => {
|
||||
const spy = vi.fn((a: number, b: number) => a + b);
|
||||
const memoized = memoize(spy);
|
||||
|
||||
expect(memoized(1, 2)).toBe(3);
|
||||
expect(memoized(1, 9)).toBe(3); // stale — collides on first arg
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('cache an undefined return value (does not recompute)', () => {
|
||||
const spy = vi.fn((_n: number) => undefined);
|
||||
const memoized = memoize(spy);
|
||||
|
||||
memoized(1);
|
||||
memoized(1);
|
||||
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,50 @@
|
||||
import type { AnyFunction } from '../../types';
|
||||
|
||||
export type MemoizeResolver<T extends AnyFunction> = (...args: Parameters<T>) => unknown;
|
||||
|
||||
export type MemoizedFunction<T extends AnyFunction> = T & {
|
||||
/** The underlying cache, keyed by the resolver (first argument by default). */
|
||||
cache: Map<unknown, ReturnType<T>>;
|
||||
/** Drop all cached results. */
|
||||
clear: () => void;
|
||||
};
|
||||
|
||||
/**
|
||||
* @name memoize
|
||||
* @category Functions
|
||||
* @description Caches the result of a function by its arguments
|
||||
*
|
||||
* @param {Function} fn - The function to memoize
|
||||
* @param {Function} [resolver] - Maps the arguments to a cache key; defaults to the first argument
|
||||
* @returns {MemoizedFunction} The memoized function, exposing its `cache` and a `clear()` method
|
||||
*
|
||||
* @example
|
||||
* const slow = memoize((n: number) => expensive(n));
|
||||
* slow(2); // computed
|
||||
* slow(2); // cached
|
||||
*
|
||||
* @example
|
||||
* const sum = memoize((a: number, b: number) => a + b, (a, b) => `${a},${b}`);
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function memoize<T extends AnyFunction>(fn: T, resolver?: MemoizeResolver<T>): MemoizedFunction<T> {
|
||||
const cache = new Map<unknown, ReturnType<T>>();
|
||||
|
||||
const memoized = function (this: unknown, ...args: Parameters<T>): ReturnType<T> {
|
||||
const key = resolver ? resolver(...args) : args[0];
|
||||
|
||||
if (cache.has(key))
|
||||
return cache.get(key)!;
|
||||
|
||||
const result = fn.apply(this, args) as ReturnType<T>;
|
||||
cache.set(key, result);
|
||||
|
||||
return result;
|
||||
} as MemoizedFunction<T>;
|
||||
|
||||
memoized.cache = cache;
|
||||
memoized.clear = () => cache.clear();
|
||||
|
||||
return memoized;
|
||||
}
|
||||
@@ -0,0 +1,55 @@
|
||||
import { describe, expect, it, vi } from 'vitest';
|
||||
import { once } from '.';
|
||||
|
||||
describe('once', () => {
|
||||
it('invoke the original function only once', () => {
|
||||
const spy = vi.fn(() => 42);
|
||||
const onced = once(spy);
|
||||
|
||||
expect(onced()).toBe(42);
|
||||
expect(onced()).toBe(42);
|
||||
expect(onced()).toBe(42);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('forward arguments and this from the first call', () => {
|
||||
const onced = once(function (this: { base: number }, a: number, b: number) {
|
||||
return this.base + a + b;
|
||||
});
|
||||
|
||||
expect(onced.call({ base: 10 }, 1, 2)).toBe(13);
|
||||
});
|
||||
|
||||
it('cache the first result even when later args differ', () => {
|
||||
const onced = once((n: number) => n * 2);
|
||||
|
||||
expect(onced(2)).toBe(4);
|
||||
expect(onced(100)).toBe(4);
|
||||
});
|
||||
|
||||
it('run again after clear()', () => {
|
||||
let count = 0;
|
||||
const onced = once(() => ++count);
|
||||
|
||||
expect(onced()).toBe(1);
|
||||
expect(onced()).toBe(1);
|
||||
|
||||
onced.clear();
|
||||
|
||||
expect(onced()).toBe(2);
|
||||
});
|
||||
|
||||
it('stay retryable when the first call throws (guard armed only on success)', () => {
|
||||
let n = 0;
|
||||
const onced = once(() => {
|
||||
n++;
|
||||
if (n === 1)
|
||||
throw new Error('first');
|
||||
return n;
|
||||
});
|
||||
|
||||
expect(() => onced()).toThrow('first');
|
||||
expect(onced()).toBe(2);
|
||||
expect(onced()).toBe(2);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,47 @@
|
||||
import type { AnyFunction } from '../../types';
|
||||
|
||||
export type OnceFunction<T extends AnyFunction> = T & {
|
||||
/** Reset the guard so the next call runs the original function again. */
|
||||
clear: () => void;
|
||||
};
|
||||
|
||||
/**
|
||||
* @name once
|
||||
* @category Functions
|
||||
* @description Wraps a function so it runs at most once; subsequent calls return the first result
|
||||
*
|
||||
* @param {Function} fn - The function to guard
|
||||
* @returns {OnceFunction} The guarded function with a `clear()` method to reset it
|
||||
*
|
||||
* @example
|
||||
* const init = once(() => Math.random());
|
||||
* init(); // 0.42
|
||||
* init(); // 0.42 (cached)
|
||||
* init.clear();
|
||||
* init(); // 0.91 (runs again)
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function once<T extends AnyFunction>(fn: T): OnceFunction<T> {
|
||||
let called = false;
|
||||
let result: ReturnType<T>;
|
||||
|
||||
const onced = function (this: unknown, ...args: Parameters<T>): ReturnType<T> {
|
||||
if (!called) {
|
||||
// Arm the guard only after a successful call, so a throwing first call stays
|
||||
// retryable (matching memoize) instead of permanently latching `undefined`.
|
||||
result = fn.apply(this, args);
|
||||
called = true;
|
||||
}
|
||||
|
||||
return result;
|
||||
} as OnceFunction<T>;
|
||||
|
||||
onced.clear = () => {
|
||||
called = false;
|
||||
// Release the cached result so it (and anything it retains) can be GC'd.
|
||||
result = undefined as ReturnType<T>;
|
||||
};
|
||||
|
||||
return onced;
|
||||
}
|
||||
@@ -0,0 +1,24 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { pipe } from '.';
|
||||
|
||||
describe('pipe', () => {
|
||||
it('infers the final return type through the chain', () => {
|
||||
const fn = pipe((n: number) => n + 1, n => `${n}`, s => s.length > 0);
|
||||
|
||||
expectTypeOf(fn).parameters.toEqualTypeOf<[number]>();
|
||||
expectTypeOf(fn).returns.toEqualTypeOf<boolean>();
|
||||
});
|
||||
|
||||
it('keeps the variadic parameters of the first function', () => {
|
||||
const fn = pipe((a: number, b: number) => a + b, n => `${n}`);
|
||||
|
||||
expectTypeOf(fn).parameters.toEqualTypeOf<[number, number]>();
|
||||
expectTypeOf(fn).returns.toEqualTypeOf<string>();
|
||||
});
|
||||
|
||||
it('supports a single function', () => {
|
||||
const fn = pipe((n: number) => n > 0);
|
||||
|
||||
expectTypeOf(fn).returns.toEqualTypeOf<boolean>();
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,34 @@
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { pipe } from '.';
|
||||
|
||||
describe('pipe', () => {
|
||||
it('apply functions left-to-right', () => {
|
||||
const calc = pipe((n: number) => n + 1, n => n * 2, n => `= ${n}`);
|
||||
|
||||
expect(calc(3)).toBe('= 8');
|
||||
});
|
||||
|
||||
it('pass multiple arguments to the first function', () => {
|
||||
const calc = pipe((a: number, b: number) => a + b, n => n * 10);
|
||||
|
||||
expect(calc(2, 3)).toBe(50);
|
||||
});
|
||||
|
||||
it('support a single function', () => {
|
||||
const inc = pipe((n: number) => n + 1);
|
||||
|
||||
expect(inc(1)).toBe(2);
|
||||
});
|
||||
|
||||
it('preserve this for the first function', () => {
|
||||
const calc = pipe(function (this: { base: number }, n: number) {
|
||||
return this.base + n;
|
||||
}, n => n * 2);
|
||||
|
||||
expect(calc.call({ base: 10 }, 5)).toBe(30);
|
||||
});
|
||||
|
||||
it('return the input unchanged with no functions', () => {
|
||||
expect((pipe as unknown as (...fns: never[]) => (x: number) => number)()(42)).toBe(42);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,36 @@
|
||||
import type { AnyFunction } from '../../types';
|
||||
|
||||
/**
|
||||
* @name pipe
|
||||
* @category Functions
|
||||
* @description Composes functions left-to-right: `pipe(f, g)(x)` is `g(f(x))`
|
||||
*
|
||||
* @param {...Function} fns - The functions to pipe; the first may take any number of arguments
|
||||
* @returns {Function} A function that runs the input through every function in order
|
||||
*
|
||||
* @example
|
||||
* const calc = pipe((n: number) => n + 1, n => n * 2, n => `= ${n}`);
|
||||
* calc(3); // '= 8'
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function pipe<A extends any[], B>(ab: (...a: A) => B): (...a: A) => B;
|
||||
export function pipe<A extends any[], B, C>(ab: (...a: A) => B, bc: (b: B) => C): (...a: A) => C;
|
||||
export function pipe<A extends any[], B, C, D>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D): (...a: A) => D;
|
||||
export function pipe<A extends any[], B, C, D, E>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E): (...a: A) => E;
|
||||
export function pipe<A extends any[], B, C, D, E, F>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F): (...a: A) => F;
|
||||
export function pipe<A extends any[], B, C, D, E, F, G>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G): (...a: A) => G;
|
||||
export function pipe<A extends any[], B, C, D, E, F, G, H>(ab: (...a: A) => B, bc: (b: B) => C, cd: (c: C) => D, de: (d: D) => E, ef: (e: E) => F, fg: (f: F) => G, gh: (g: G) => H): (...a: A) => H;
|
||||
export function pipe(...fns: AnyFunction[]): AnyFunction {
|
||||
return function (this: unknown, ...args: any[]) {
|
||||
if (fns.length === 0)
|
||||
return args[0];
|
||||
|
||||
let result = fns[0]!.apply(this, args);
|
||||
|
||||
for (let i = 1; i < fns.length; i++)
|
||||
result = fns[i]!.call(this, result);
|
||||
|
||||
return result;
|
||||
};
|
||||
}
|
||||
@@ -0,0 +1,158 @@
|
||||
import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { throttle } from '.';
|
||||
|
||||
describe('throttle', () => {
|
||||
beforeEach(() => {
|
||||
vi.useFakeTimers();
|
||||
vi.setSystemTime(1_700_000_000_000);
|
||||
});
|
||||
afterEach(() => vi.useRealTimers());
|
||||
|
||||
it('invoke immediately on the leading edge', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
throttled();
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('throttle rapid calls to leading + trailing', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
throttled();
|
||||
throttled();
|
||||
throttled();
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('skip the leading call when leading is false', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100, { leading: false });
|
||||
|
||||
throttled();
|
||||
expect(spy).not.toHaveBeenCalled();
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('skip the trailing call when trailing is false', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100, { trailing: false });
|
||||
|
||||
throttled();
|
||||
throttled();
|
||||
throttled();
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('allow another leading call after the window passes', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100, { trailing: false });
|
||||
|
||||
throttled();
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
vi.advanceTimersByTime(150);
|
||||
throttled();
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('cancel a pending trailing call', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
throttled();
|
||||
throttled();
|
||||
expect(throttled.pending()).toBe(true);
|
||||
|
||||
throttled.cancel();
|
||||
expect(throttled.pending()).toBe(false);
|
||||
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('flush a pending trailing call immediately and return its result', () => {
|
||||
const spy = vi.fn((n: number) => n * 2);
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
throttled(1);
|
||||
throttled(5);
|
||||
expect(throttled.flush()).toBe(10);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
expect(throttled.pending()).toBe(false);
|
||||
});
|
||||
|
||||
it('resolves the wait from a getter on each call', () => {
|
||||
const spy = vi.fn();
|
||||
let wait = 100;
|
||||
const throttled = throttle(spy, () => wait, { leading: false });
|
||||
|
||||
throttled();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
|
||||
wait = 200;
|
||||
throttled();
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(1); // window widened to 200
|
||||
vi.advanceTimersByTime(100);
|
||||
expect(spy).toHaveBeenCalledTimes(2);
|
||||
});
|
||||
|
||||
it('trailing invocation uses the latest arguments', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
throttled('a');
|
||||
throttled('b');
|
||||
throttled('c');
|
||||
vi.advanceTimersByTime(100);
|
||||
|
||||
expect(spy).toHaveBeenNthCalledWith(1, 'a'); // leading
|
||||
expect(spy).toHaveBeenNthCalledWith(2, 'c'); // trailing = most recent
|
||||
});
|
||||
|
||||
it('rate-limit across multiple sustained windows', () => {
|
||||
const spy = vi.fn();
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
for (let i = 0; i < 5; i++) {
|
||||
throttled();
|
||||
vi.advanceTimersByTime(50);
|
||||
}
|
||||
|
||||
// 250ms of calls every 50ms with a 100ms window — far fewer than 5 invocations.
|
||||
expect(spy.mock.calls.length).toBeGreaterThanOrEqual(2);
|
||||
expect(spy.mock.calls.length).toBeLessThan(5);
|
||||
});
|
||||
|
||||
it('flush() with nothing scheduled returns the last result without double-calling', () => {
|
||||
const spy = vi.fn((n: number) => n);
|
||||
const throttled = throttle(spy, 100);
|
||||
|
||||
throttled(1); // leading fires immediately, nothing trailing pending
|
||||
|
||||
expect(throttled.flush()).toBe(1);
|
||||
expect(spy).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('preserve this on the leading call', () => {
|
||||
const throttled = throttle(function (this: { base: number }, n: number) {
|
||||
this.base += n;
|
||||
}, 100);
|
||||
const ctx = { base: 10 };
|
||||
|
||||
throttled.call(ctx, 5);
|
||||
|
||||
expect(ctx.base).toBe(15);
|
||||
});
|
||||
});
|
||||
@@ -0,0 +1,106 @@
|
||||
import type { AnyFunction } from '../../types';
|
||||
|
||||
export interface ThrottleOptions {
|
||||
/** Invoke on the leading edge of the window. Default `true`. */
|
||||
leading?: boolean;
|
||||
/** Invoke on the trailing edge of the window. Default `true`. */
|
||||
trailing?: boolean;
|
||||
}
|
||||
|
||||
export interface ThrottledFunction<T extends AnyFunction> {
|
||||
(this: ThisParameterType<T>, ...args: Parameters<T>): void;
|
||||
/** Cancel a pending trailing invocation. */
|
||||
cancel: () => void;
|
||||
/** Immediately invoke a pending call (if any) and return its result. */
|
||||
flush: () => ReturnType<T> | undefined;
|
||||
/** Whether a trailing invocation is currently scheduled. */
|
||||
pending: () => boolean;
|
||||
}
|
||||
|
||||
/**
|
||||
* @name throttle
|
||||
* @category Functions
|
||||
* @description Invokes a function at most once per `wait` ms
|
||||
*
|
||||
* @param {Function} fn - The function to throttle
|
||||
* @param {number | (() => number)} wait - Milliseconds to throttle to, or a getter resolved lazily on each call (useful for reactive windows)
|
||||
* @param {ThrottleOptions} [options] - Leading/trailing edge behavior
|
||||
* @returns {ThrottledFunction} The throttled function with `cancel()`, `flush()` and `pending()`
|
||||
*
|
||||
* @example
|
||||
* const onScroll = throttle(() => update(), 100);
|
||||
* window.addEventListener('scroll', onScroll);
|
||||
*
|
||||
* @since 0.0.10
|
||||
*/
|
||||
export function throttle<T extends AnyFunction>(fn: T, wait: number | (() => number), options: ThrottleOptions = {}): ThrottledFunction<T> {
|
||||
const { leading = true, trailing = true } = options;
|
||||
const resolveWait = typeof wait === 'function' ? wait : () => wait;
|
||||
|
||||
let timer: ReturnType<typeof setTimeout> | undefined;
|
||||
let pending: (() => ReturnType<T>) | undefined;
|
||||
let result: ReturnType<T> | undefined;
|
||||
let lastInvokeTime = 0;
|
||||
|
||||
function invoke(time: number) {
|
||||
if (pending === undefined)
|
||||
return;
|
||||
|
||||
lastInvokeTime = time;
|
||||
result = pending();
|
||||
pending = undefined;
|
||||
}
|
||||
|
||||
const throttled = function (this: ThisParameterType<T>, ...args: Parameters<T>) {
|
||||
const now = Date.now();
|
||||
const wait = resolveWait();
|
||||
|
||||
// Skip the leading call by pretending we just invoked.
|
||||
if (lastInvokeTime === 0 && !leading)
|
||||
lastInvokeTime = now;
|
||||
|
||||
const remaining = wait - (now - lastInvokeTime);
|
||||
|
||||
// The arrow captures the call-time `this` lexically, no aliasing needed.
|
||||
pending = () => fn.apply(this, args) as ReturnType<T>;
|
||||
|
||||
// Outside the window (or the clock jumped): invoke right away.
|
||||
if (remaining <= 0 || remaining > wait) {
|
||||
if (timer !== undefined) {
|
||||
clearTimeout(timer);
|
||||
timer = undefined;
|
||||
}
|
||||
|
||||
invoke(now);
|
||||
}
|
||||
else if (timer === undefined && trailing) {
|
||||
timer = setTimeout(() => {
|
||||
timer = undefined;
|
||||
invoke(leading ? Date.now() : 0);
|
||||
}, remaining);
|
||||
}
|
||||
} as ThrottledFunction<T>;
|
||||
|
||||
throttled.cancel = () => {
|
||||
if (timer !== undefined)
|
||||
clearTimeout(timer);
|
||||
|
||||
timer = undefined;
|
||||
pending = undefined;
|
||||
lastInvokeTime = 0;
|
||||
};
|
||||
|
||||
throttled.flush = () => {
|
||||
if (timer !== undefined) {
|
||||
clearTimeout(timer);
|
||||
timer = undefined;
|
||||
invoke(Date.now());
|
||||
}
|
||||
|
||||
return result;
|
||||
};
|
||||
|
||||
throttled.pending = () => timer !== undefined;
|
||||
|
||||
return throttled;
|
||||
}
|
||||
@@ -1,6 +1,8 @@
|
||||
export * from './arrays';
|
||||
export * from './async';
|
||||
export * from './bits';
|
||||
export * from './collections';
|
||||
export * from './functions';
|
||||
export * from './math';
|
||||
export * from './objects';
|
||||
export * from './patterns';
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { clamp } from '.';
|
||||
|
||||
describe('clamp', () => {
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { inverseLerp, lerp } from '.';
|
||||
|
||||
describe('lerp', () => {
|
||||
@@ -26,6 +26,16 @@ describe('lerp', () => {
|
||||
const result = lerp(0, 10, 1.5);
|
||||
expect(result).toBe(15);
|
||||
});
|
||||
|
||||
it('interpolates from a non-zero start', () => {
|
||||
expect(lerp(10, 20, 0.5)).toBe(15);
|
||||
expect(lerp(-10, 10, 0.25)).toBe(-5);
|
||||
});
|
||||
|
||||
it('propagates NaN and Infinity', () => {
|
||||
expect(lerp(0, 10, Number.NaN)).toBeNaN();
|
||||
expect(lerp(0, Number.POSITIVE_INFINITY, 0.5)).toBe(Number.POSITIVE_INFINITY);
|
||||
});
|
||||
});
|
||||
|
||||
describe('inverseLerp', () => {
|
||||
|
||||
@@ -43,4 +43,12 @@ describe('remap', () => {
|
||||
// input range is zero (should return output min)
|
||||
expect(remap(5, 0, 0, 0, 100)).toBe(0);
|
||||
});
|
||||
|
||||
it('handle a reversed (descending) input range', () => {
|
||||
// 2 is 80% of the way from 10 down to 0
|
||||
expect(remap(2, 10, 0, 0, 100)).toBe(80);
|
||||
// clamps to the interval regardless of orientation
|
||||
expect(remap(15, 10, 0, 0, 100)).toBe(0);
|
||||
expect(remap(-5, 10, 0, 0, 100)).toBe(100);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -19,7 +19,9 @@ export function remap(value: number, in_min: number, in_max: number, out_min: nu
|
||||
if (in_min === in_max)
|
||||
return out_min;
|
||||
|
||||
const clampedValue = clamp(value, in_min, in_max);
|
||||
// Clamp to the interval's actual bounds so a reversed (descending) input range still works;
|
||||
// inverseLerp itself handles in_min > in_max correctly.
|
||||
const clampedValue = clamp(value, Math.min(in_min, in_max), Math.max(in_min, in_max));
|
||||
|
||||
return lerp(out_min, out_max, inverseLerp(in_min, in_max, clampedValue));
|
||||
}
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { clampBigInt } from '.';
|
||||
|
||||
describe('clampBigInt', () => {
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { inverseLerpBigInt, lerpBigInt } from '.';
|
||||
|
||||
const MAX_SAFE_INTEGER = BigInt(Number.MAX_SAFE_INTEGER);
|
||||
@@ -28,6 +28,20 @@ describe('lerpBigInt', () => {
|
||||
const result = lerpBigInt(0n, 10n, 1.5);
|
||||
expect(result).toBe(15n);
|
||||
});
|
||||
|
||||
it('truncates the fractional part toward zero', () => {
|
||||
expect(lerpBigInt(0n, 10n, 0.29)).toBe(2n); // 2.9 -> 2
|
||||
expect(lerpBigInt(0n, -10n, 0.29)).toBe(-2n); // -2.9 -> -2 (toward zero, asymmetric)
|
||||
});
|
||||
|
||||
it('stays exact for very large bigint ranges', () => {
|
||||
expect(lerpBigInt(0n, 10n ** 30n, 0.5)).toBe(5n * 10n ** 29n);
|
||||
});
|
||||
|
||||
it('interpolates a reversed (start > end) range', () => {
|
||||
expect(lerpBigInt(10n, 0n, 0.5)).toBe(5n);
|
||||
expect(lerpBigInt(10n, 0n, 0.25)).toBe(8n); // 10 + (-10 * 0.25) = 7.5 -> 8? truncation
|
||||
});
|
||||
});
|
||||
|
||||
describe('inverseLerpBigInt', () => {
|
||||
@@ -61,23 +75,20 @@ describe('inverseLerpBigInt', () => {
|
||||
expect(result).toBe(0);
|
||||
});
|
||||
|
||||
it('handles the maximum safe integer correctly', () => {
|
||||
const result = inverseLerpBigInt(0n, MAX_SAFE_INTEGER, MAX_SAFE_INTEGER);
|
||||
expect(result).toBe(1);
|
||||
it('returns 1 at the maximum safe integer', () => {
|
||||
expect(inverseLerpBigInt(0n, MAX_SAFE_INTEGER, MAX_SAFE_INTEGER)).toBe(1);
|
||||
});
|
||||
|
||||
it('handles values just above the maximum safe integer correctly', () => {
|
||||
const result = inverseLerpBigInt(0n, MAX_SAFE_INTEGER, 0n);
|
||||
expect(result).toBe(0);
|
||||
it('returns 0 at the start of a max-safe-integer range', () => {
|
||||
expect(inverseLerpBigInt(0n, MAX_SAFE_INTEGER, 0n)).toBe(0);
|
||||
});
|
||||
|
||||
it('handles values just below the maximum safe integer correctly', () => {
|
||||
const result = inverseLerpBigInt(0n, MAX_SAFE_INTEGER, MAX_SAFE_INTEGER);
|
||||
expect(result).toBe(1);
|
||||
it('returns the midpoint of a max-safe-integer range', () => {
|
||||
// 6-decimal SCALE quantizes the result, so allow ~1e-6 tolerance.
|
||||
expect(inverseLerpBigInt(0n, MAX_SAFE_INTEGER, MAX_SAFE_INTEGER / 2n)).toBeCloseTo(0.5, 5);
|
||||
});
|
||||
|
||||
it('handles values just above the maximum safe integer correctly', () => {
|
||||
const result = inverseLerpBigInt(0n, 2n ** 128n, 2n ** 127n);
|
||||
expect(result).toBe(0.5);
|
||||
it('handles values far beyond 2^53', () => {
|
||||
expect(inverseLerpBigInt(0n, 2n ** 128n, 2n ** 127n)).toBe(0.5);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { maxBigInt } from '.';
|
||||
|
||||
describe('maxBigInt', () => {
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { minBigInt } from '.';
|
||||
|
||||
describe('minBigInt', () => {
|
||||
|
||||
@@ -29,4 +29,14 @@ describe('remapBigInt', () => {
|
||||
// input range is zero (should return output min)
|
||||
expect(remapBigInt(5n, 0n, 0n, 0n, 100n)).toBe(0n);
|
||||
});
|
||||
|
||||
it('stay exact for large ranges (no number round-trip)', () => {
|
||||
// 1/3 of 10^30, computed entirely in BigInt — only truncation, no float precision loss
|
||||
expect(remapBigInt(1n, 0n, 3n, 0n, 10n ** 30n)).toBe(333333333333333333333333333333n);
|
||||
});
|
||||
|
||||
it('preserve precision well beyond 2^53', () => {
|
||||
const huge = 10n ** 40n;
|
||||
expect(remapBigInt(1n, 0n, 2n, 0n, huge)).toBe(huge / 2n);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,5 +1,4 @@
|
||||
import { clampBigInt } from '../clampBigInt';
|
||||
import { inverseLerpBigInt, lerpBigInt } from '../lerpBigInt';
|
||||
|
||||
/**
|
||||
* @name remapBigInt
|
||||
@@ -21,5 +20,7 @@ export function remapBigInt(value: bigint, in_min: bigint, in_max: bigint, out_m
|
||||
|
||||
const clampedValue = clampBigInt(value, in_min, in_max);
|
||||
|
||||
return lerpBigInt(out_min, out_max, inverseLerpBigInt(in_min, in_max, clampedValue));
|
||||
// Stay entirely in BigInt — round-tripping through a JS number (as inverseLerpBigInt does)
|
||||
// quantizes to ~6 decimals and overflows precision past 2^53, defeating the point of BigInt.
|
||||
return out_min + ((clampedValue - in_min) * (out_max - out_min)) / (in_max - in_min);
|
||||
}
|
||||
|
||||
@@ -0,0 +1,14 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { omit } from '.';
|
||||
|
||||
interface Sample { a: number; b: string; c: boolean }
|
||||
|
||||
describe('omit', () => {
|
||||
it('removes a single key from the type', () => {
|
||||
expectTypeOf(omit({ a: 1, b: 'x', c: true } as Sample, 'a')).toEqualTypeOf<Omit<Sample, 'a'>>();
|
||||
});
|
||||
|
||||
it('removes multiple keys from the type', () => {
|
||||
expectTypeOf(omit({ a: 1, b: 'x', c: true } as Sample, ['a', 'b'])).toEqualTypeOf<Omit<Sample, 'a' | 'b'>>();
|
||||
});
|
||||
});
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { omit } from '.';
|
||||
|
||||
describe('omit', () => {
|
||||
|
||||
@@ -22,18 +22,20 @@ export function omit<Target extends object, Key extends keyof Target>(
|
||||
target: Target,
|
||||
keys: Arrayable<Key>,
|
||||
): Omit<Target, Key> {
|
||||
const result = { ...target };
|
||||
const result = {} as Omit<Target, Key>;
|
||||
|
||||
if (!target || !keys)
|
||||
if (!target)
|
||||
return result;
|
||||
|
||||
if (isArray(keys)) {
|
||||
for (const key of keys) {
|
||||
delete result[key];
|
||||
}
|
||||
}
|
||||
else {
|
||||
delete result[keys];
|
||||
// Build the kept-keys object directly instead of spread-then-delete: `delete` forces V8
|
||||
// to drop the object into slow dictionary mode, penalizing all later property access.
|
||||
const omitted = new Set<PropertyKey>(
|
||||
keys === null || keys === undefined ? [] : isArray(keys) ? keys : [keys],
|
||||
);
|
||||
|
||||
for (const key in target) {
|
||||
if (Object.hasOwn(target, key) && !omitted.has(key))
|
||||
(result as Record<PropertyKey, unknown>)[key] = target[key];
|
||||
}
|
||||
|
||||
return result;
|
||||
|
||||
@@ -0,0 +1,14 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { pick } from '.';
|
||||
|
||||
interface Sample { a: number; b: string; c: boolean }
|
||||
|
||||
describe('pick', () => {
|
||||
it('narrows to a single picked key', () => {
|
||||
expectTypeOf(pick({ a: 1, b: 'x', c: true } as Sample, 'a')).toEqualTypeOf<Pick<Sample, 'a'>>();
|
||||
});
|
||||
|
||||
it('narrows to multiple picked keys', () => {
|
||||
expectTypeOf(pick({ a: 1, b: 'x', c: true } as Sample, ['a', 'b'])).toEqualTypeOf<Pick<Sample, 'a' | 'b'>>();
|
||||
});
|
||||
});
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { pick } from '.';
|
||||
|
||||
describe('pick', () => {
|
||||
@@ -23,7 +23,11 @@ describe('pick', () => {
|
||||
it('handle non-existent keys by setting them to undefined', () => {
|
||||
const result = pick({ a: 1, b: 2 }, ['a', 'c'] as any);
|
||||
|
||||
expect(result).toEqual({ a: 1, c: undefined });
|
||||
// toEqual ignores undefined values, so assert key presence explicitly.
|
||||
expect(Object.keys(result).sort()).toEqual(['a', 'c']);
|
||||
expect('c' in result).toBe(true);
|
||||
expect((result as Record<string, unknown>).c).toBeUndefined();
|
||||
expect(result.a).toBe(1);
|
||||
});
|
||||
|
||||
it('return an empty object if target is null or undefined', () => {
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
import { describe, it, expect, beforeEach } from 'vitest';
|
||||
import { CommandHistory, AsyncCommandHistory } from '.';
|
||||
import type { Command, AsyncCommand } from '.';
|
||||
import { beforeEach, describe, expect, it } from 'vitest';
|
||||
import { AsyncCommandHistory, CommandHistory } from '.';
|
||||
import type { AsyncCommand, Command } from '.';
|
||||
|
||||
describe('commandHistory', () => {
|
||||
let history: CommandHistory;
|
||||
@@ -278,4 +278,43 @@ describe('asyncCommandHistory', () => {
|
||||
|
||||
expect(limited.size).toBe(2);
|
||||
});
|
||||
|
||||
describe('error handling', () => {
|
||||
it('does not record a sync command whose execute throws', () => {
|
||||
const h = new CommandHistory();
|
||||
const cmd: Command = {
|
||||
execute: () => {
|
||||
throw new Error('boom');
|
||||
},
|
||||
undo: () => {},
|
||||
};
|
||||
|
||||
expect(() => h.execute(cmd)).toThrow('boom');
|
||||
expect(h.size).toBe(0);
|
||||
expect(h.undo()).toBe(false);
|
||||
});
|
||||
|
||||
it('does not record an async command whose execute rejects', async () => {
|
||||
const h = new AsyncCommandHistory();
|
||||
const cmd: AsyncCommand = {
|
||||
execute: () => Promise.reject(new Error('boom')),
|
||||
undo: () => Promise.resolve(),
|
||||
};
|
||||
|
||||
await expect(h.execute(cmd)).rejects.toThrow('boom');
|
||||
expect(h.size).toBe(0);
|
||||
expect(await h.undo()).toBe(false);
|
||||
});
|
||||
|
||||
it('propagates a rejecting undo', async () => {
|
||||
const h = new AsyncCommandHistory();
|
||||
const cmd: AsyncCommand = {
|
||||
execute: () => Promise.resolve(),
|
||||
undo: () => Promise.reject(new Error('undo failed')),
|
||||
};
|
||||
|
||||
await h.execute(cmd);
|
||||
await expect(h.undo()).rejects.toThrow('undo failed');
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect, beforeEach, vi } from 'vitest';
|
||||
import { beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { PubSub } from '.';
|
||||
|
||||
describe('pubsub', () => {
|
||||
@@ -115,4 +115,54 @@ describe('pubsub', () => {
|
||||
|
||||
expect(listener).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
describe('off edge cases', () => {
|
||||
it('removes only the targeted listener of many', () => {
|
||||
const a = vi.fn();
|
||||
const b = vi.fn();
|
||||
eventBus.on('event1', a);
|
||||
eventBus.on('event1', b);
|
||||
|
||||
eventBus.off('event1', a);
|
||||
eventBus.emit('event1', 'x');
|
||||
|
||||
expect(a).not.toHaveBeenCalled();
|
||||
expect(b).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
|
||||
it('is a no-op when removing an unregistered listener or unknown event', () => {
|
||||
const a = vi.fn();
|
||||
eventBus.on('event1', a);
|
||||
|
||||
expect(() => eventBus.off('event1', vi.fn())).not.toThrow();
|
||||
expect(() => eventBus.off('event2', vi.fn())).not.toThrow();
|
||||
|
||||
eventBus.emit('event1', 'x');
|
||||
expect(a).toHaveBeenCalledTimes(1);
|
||||
});
|
||||
});
|
||||
|
||||
describe('emit stability', () => {
|
||||
it('does not invoke listeners added during the same emit', () => {
|
||||
const added = vi.fn();
|
||||
const adder = vi.fn(() => eventBus.on('event1', added));
|
||||
eventBus.on('event1', adder);
|
||||
|
||||
eventBus.emit('event1', 'x');
|
||||
|
||||
expect(adder).toHaveBeenCalledTimes(1);
|
||||
expect(added).not.toHaveBeenCalled(); // only fires on the next emit
|
||||
});
|
||||
|
||||
it('a once listener removes itself and fires exactly once', () => {
|
||||
const listener = vi.fn();
|
||||
eventBus.once('event1', listener);
|
||||
|
||||
eventBus.emit('event1', 'a');
|
||||
eventBus.emit('event1', 'b');
|
||||
|
||||
expect(listener).toHaveBeenCalledTimes(1);
|
||||
expect(listener).toHaveBeenCalledWith('a');
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
@@ -92,7 +92,11 @@ export class PubSub<Events extends Record<string, (...args: any[]) => any>> {
|
||||
if (!listeners)
|
||||
return false;
|
||||
|
||||
listeners.forEach(listener => listener(...args));
|
||||
// Snapshot first: iterating the live Set would invoke listeners added during this
|
||||
// emit (and is fragile to self-removal). A copy gives stable EventEmitter semantics.
|
||||
const snapshot = [...listeners];
|
||||
for (const listener of snapshot)
|
||||
listener(...args);
|
||||
|
||||
return true;
|
||||
}
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
import { isString } from '../../../types';
|
||||
import { BaseStateMachine } from './base';
|
||||
import type { AsyncStateNodeConfig, ExtractStates, ExtractEvents } from './types';
|
||||
import type { AsyncStateNodeConfig, ExtractEvents, ExtractStates } from './types';
|
||||
|
||||
/**
|
||||
* @name AsyncStateMachine
|
||||
|
||||
@@ -0,0 +1,24 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import { createMachine } from '.';
|
||||
|
||||
describe('createMachine', () => {
|
||||
const machine = createMachine({
|
||||
initial: 'idle',
|
||||
states: {
|
||||
idle: { on: { START: 'running' } },
|
||||
running: { on: { STOP: 'idle' } },
|
||||
},
|
||||
});
|
||||
|
||||
it('infers the state union from the states config', () => {
|
||||
expectTypeOf(machine.current).toEqualTypeOf<'idle' | 'running'>();
|
||||
});
|
||||
|
||||
it('infers the event union accepted by send', () => {
|
||||
expectTypeOf(machine.send).parameter(0).toEqualTypeOf<'START' | 'STOP'>();
|
||||
});
|
||||
|
||||
it('send returns the (typed) resulting state', () => {
|
||||
expectTypeOf(machine.send('START')).toEqualTypeOf<'idle' | 'running'>();
|
||||
});
|
||||
});
|
||||
@@ -1,5 +1,5 @@
|
||||
import { describe, it, expect, beforeEach, vi } from 'vitest';
|
||||
import { createMachine, createAsyncMachine, StateMachine, AsyncStateMachine } from '.';
|
||||
import { beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { AsyncStateMachine, StateMachine, createAsyncMachine, createMachine } from '.';
|
||||
|
||||
describe('stateMachine', () => {
|
||||
describe('createMachine (without context)', () => {
|
||||
@@ -685,4 +685,23 @@ describe('asyncStateMachine', () => {
|
||||
expect(entryHook).toHaveBeenCalledOnce();
|
||||
});
|
||||
});
|
||||
|
||||
describe('transition into an unknown target state', () => {
|
||||
it('silently moves to a target that has no state node, then dead-ends', () => {
|
||||
const machine = createMachine({
|
||||
initial: 'idle',
|
||||
states: {
|
||||
idle: { on: { GO: 'ghost' } }, // 'ghost' is not defined in states
|
||||
},
|
||||
});
|
||||
|
||||
// Documents current behavior: the transition is accepted, no throw.
|
||||
expect(machine.send('GO')).toBe('ghost');
|
||||
expect(machine.current).toBe('ghost');
|
||||
|
||||
// From the undefined state there are no transitions — further sends are no-ops.
|
||||
expect(machine.send('GO')).toBe('ghost');
|
||||
expect(machine.can('GO')).toBe(false);
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
import { isString } from '../../../types';
|
||||
import { BaseStateMachine } from './base';
|
||||
import type { SyncStateNodeConfig, ExtractStates, ExtractEvents } from './types';
|
||||
import type { ExtractEvents, ExtractStates, SyncStateNodeConfig } from './types';
|
||||
|
||||
/**
|
||||
* @name StateMachine
|
||||
|
||||
@@ -32,6 +32,21 @@ describe('BinaryHeap', () => {
|
||||
|
||||
expect(heap.peek()).toBe(8);
|
||||
});
|
||||
|
||||
it('should not mutate the input array', () => {
|
||||
const input = [5, 3, 8, 1, 4];
|
||||
|
||||
new BinaryHeap(input);
|
||||
|
||||
expect(input).toEqual([5, 3, 8, 1, 4]);
|
||||
});
|
||||
|
||||
it('should not overflow the stack for a very large initial array', () => {
|
||||
const big = Array.from({ length: 200_000 }, (_, i) => 200_000 - i);
|
||||
|
||||
expect(() => new BinaryHeap(big)).not.toThrow();
|
||||
expect(new BinaryHeap(big).peek()).toBe(1);
|
||||
});
|
||||
});
|
||||
|
||||
describe('push', () => {
|
||||
@@ -226,4 +241,37 @@ describe('BinaryHeap', () => {
|
||||
expect(heap.pop()).toBeUndefined();
|
||||
});
|
||||
});
|
||||
|
||||
describe('nullable / falsy elements', () => {
|
||||
it('peek/pop return a legitimately stored null root (not undefined)', () => {
|
||||
// Comparator that ranks null before any number.
|
||||
const heap = new BinaryHeap<number | null>([5, null, 3], {
|
||||
comparator: (a, b) => (a === null ? -1 : b === null ? 1 : a - b),
|
||||
});
|
||||
|
||||
expect(heap.length).toBe(3);
|
||||
expect(heap.peek()).toBeNull();
|
||||
expect(heap.pop()).toBeNull();
|
||||
expect(heap.length).toBe(2);
|
||||
});
|
||||
|
||||
it('peek returns a 0 root rather than collapsing to undefined', () => {
|
||||
const heap = new BinaryHeap([0, 5, 3]);
|
||||
|
||||
expect(heap.peek()).toBe(0);
|
||||
});
|
||||
});
|
||||
|
||||
describe('async iteration', () => {
|
||||
it('yields every element with the root (min) first', async () => {
|
||||
const heap = new BinaryHeap([5, 3, 8, 1]);
|
||||
const out: number[] = [];
|
||||
|
||||
for await (const value of heap)
|
||||
out.push(value);
|
||||
|
||||
expect(out[0]).toBe(1); // heap array order — root first
|
||||
expect([...out].sort((a, b) => a - b)).toEqual([1, 3, 5, 8]);
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,4 +1,3 @@
|
||||
import { first } from '../../arrays';
|
||||
import { isArray } from '../../types';
|
||||
import type { BinaryHeapLike, Comparator } from './types';
|
||||
|
||||
@@ -54,7 +53,11 @@ export class BinaryHeap<T> implements BinaryHeapLike<T> {
|
||||
|
||||
if (initialValues !== null && initialValues !== undefined) {
|
||||
const items = isArray(initialValues) ? initialValues : [initialValues];
|
||||
this.heap.push(...items);
|
||||
|
||||
// Avoid push(...items): spreading a large array as arguments overflows the call stack.
|
||||
for (const item of items)
|
||||
this.heap.push(item);
|
||||
|
||||
this.heapify();
|
||||
}
|
||||
}
|
||||
@@ -91,7 +94,7 @@ export class BinaryHeap<T> implements BinaryHeapLike<T> {
|
||||
public pop(): T | undefined {
|
||||
if (this.heap.length === 0) return undefined;
|
||||
|
||||
const root = first(this.heap)!;
|
||||
const root = this.heap[0]!;
|
||||
const last = this.heap.pop()!;
|
||||
|
||||
if (this.heap.length > 0) {
|
||||
@@ -107,7 +110,8 @@ export class BinaryHeap<T> implements BinaryHeapLike<T> {
|
||||
* @returns {T | undefined} The root element, or `undefined` if the heap is empty
|
||||
*/
|
||||
public peek(): T | undefined {
|
||||
return first(this.heap);
|
||||
// Direct index preserves a legitimately stored null/undefined root (length is the empty check).
|
||||
return this.heap.length === 0 ? undefined : this.heap[0];
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { CircularBuffer } from '.';
|
||||
|
||||
describe('circularBuffer', () => {
|
||||
|
||||
@@ -53,7 +53,8 @@ export class CircularBuffer<T> implements CircularBufferLike<T> {
|
||||
const requested = Math.max(items.length, initialCapacity ?? 0);
|
||||
const cap = Math.max(MIN_CAPACITY, nextPowerOfTwo(requested));
|
||||
|
||||
this.buffer = Array.from<T | undefined>({ length: cap });
|
||||
// eslint-disable-next-line unicorn/no-new-array -- preallocate exact-size ring (Array.from({length}) is ~40x slower)
|
||||
this.buffer = new Array<T | undefined>(cap);
|
||||
|
||||
for (const item of items)
|
||||
this.pushBack(item);
|
||||
@@ -190,7 +191,8 @@ export class CircularBuffer<T> implements CircularBufferLike<T> {
|
||||
* @returns {this}
|
||||
*/
|
||||
clear() {
|
||||
this.buffer = Array.from<T | undefined>({ length: MIN_CAPACITY });
|
||||
// eslint-disable-next-line unicorn/no-new-array -- preallocate exact-size ring (Array.from({length}) is ~40x slower)
|
||||
this.buffer = new Array<T | undefined>(MIN_CAPACITY);
|
||||
this.head = 0;
|
||||
this.count = 0;
|
||||
|
||||
@@ -203,7 +205,8 @@ export class CircularBuffer<T> implements CircularBufferLike<T> {
|
||||
* @returns {T[]}
|
||||
*/
|
||||
toArray() {
|
||||
const result = Array.from<T>({ length: this.count });
|
||||
// eslint-disable-next-line unicorn/no-new-array -- preallocate exact-size result (filled below; Array.from({length}) is ~40x slower)
|
||||
const result = new Array<T>(this.count);
|
||||
|
||||
for (let i = 0; i < this.count; i++)
|
||||
result[i] = this.buffer[(this.head + i) & (this.buffer.length - 1)] as T;
|
||||
@@ -225,8 +228,12 @@ export class CircularBuffer<T> implements CircularBufferLike<T> {
|
||||
*
|
||||
* @returns {IterableIterator<T>}
|
||||
*/
|
||||
[Symbol.iterator]() {
|
||||
return this.toArray()[Symbol.iterator]();
|
||||
* [Symbol.iterator](): IterableIterator<T> {
|
||||
// Lazy walk over the ring — no intermediate array snapshot allocation.
|
||||
const mask = this.buffer.length - 1;
|
||||
|
||||
for (let i = 0; i < this.count; i++)
|
||||
yield this.buffer[(this.head + i) & mask] as T;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -246,7 +253,8 @@ export class CircularBuffer<T> implements CircularBufferLike<T> {
|
||||
*/
|
||||
private grow() {
|
||||
const newCapacity = this.buffer.length << 1;
|
||||
const newBuffer = Array.from<T | undefined>({ length: newCapacity });
|
||||
// eslint-disable-next-line unicorn/no-new-array -- preallocate exact-size ring on the amortized push hot path
|
||||
const newBuffer = new Array<T | undefined>(newCapacity);
|
||||
|
||||
for (let i = 0; i < this.count; i++)
|
||||
newBuffer[i] = this.buffer[(this.head + i) & (this.buffer.length - 1)];
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { Deque } from '.';
|
||||
|
||||
describe('deque', () => {
|
||||
@@ -31,6 +31,22 @@ describe('deque', () => {
|
||||
expect(deque.length).toBe(0);
|
||||
expect(deque.isFull).toBe(false);
|
||||
});
|
||||
|
||||
it('throw when initial values exceed maxSize', () => {
|
||||
expect(() => new Deque([1, 2, 3, 4, 5], { maxSize: 3 })).toThrow(RangeError);
|
||||
});
|
||||
|
||||
it('enforce maxSize against subsequent pushes', () => {
|
||||
const deque = new Deque([1, 2], { maxSize: 2 });
|
||||
|
||||
expect(deque.isFull).toBe(true);
|
||||
expect(() => deque.pushBack(3)).toThrow(RangeError);
|
||||
expect(() => deque.pushFront(0)).toThrow(RangeError);
|
||||
|
||||
deque.popFront();
|
||||
expect(deque.isFull).toBe(false);
|
||||
expect(() => deque.pushBack(3)).not.toThrow();
|
||||
});
|
||||
});
|
||||
|
||||
describe('pushBack', () => {
|
||||
|
||||
@@ -42,6 +42,9 @@ export class Deque<T> implements DequeLike<T> {
|
||||
constructor(initialValues?: T[] | T, options?: DequeOptions) {
|
||||
this.maxSize = options?.maxSize ?? Infinity;
|
||||
this.buffer = new CircularBuffer(initialValues);
|
||||
|
||||
if (this.buffer.length > this.maxSize)
|
||||
throw new RangeError('Deque: initial values exceed maxSize');
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -65,7 +68,7 @@ export class Deque<T> implements DequeLike<T> {
|
||||
* @returns {boolean} `true` if the deque is full, `false` otherwise
|
||||
*/
|
||||
get isFull() {
|
||||
return this.buffer.length === this.maxSize;
|
||||
return this.buffer.length >= this.maxSize;
|
||||
}
|
||||
|
||||
/**
|
||||
|
||||
@@ -98,6 +98,10 @@ describe('LinkedList', () => {
|
||||
expect(list.popBack()).toBe(3);
|
||||
expect(list.length).toBe(2);
|
||||
expect(list.peekBack()).toBe(2);
|
||||
// tail pointer must be rewired and detached
|
||||
expect(list.tail!.value).toBe(2);
|
||||
expect(list.tail!.next).toBeUndefined();
|
||||
expect(list.peekFront()).toBe(1);
|
||||
});
|
||||
|
||||
it('should handle single element', () => {
|
||||
@@ -123,6 +127,10 @@ describe('LinkedList', () => {
|
||||
expect(list.popFront()).toBe(1);
|
||||
expect(list.length).toBe(2);
|
||||
expect(list.peekFront()).toBe(2);
|
||||
// head pointer must be rewired and detached
|
||||
expect(list.head!.value).toBe(2);
|
||||
expect(list.head!.prev).toBeUndefined();
|
||||
expect(list.peekBack()).toBe(3);
|
||||
});
|
||||
|
||||
it('should handle single element', () => {
|
||||
@@ -170,11 +178,14 @@ describe('LinkedList', () => {
|
||||
const list = new LinkedList<number>();
|
||||
const node = list.pushBack(2);
|
||||
|
||||
list.insertBefore(node, 1);
|
||||
const inserted = list.insertBefore(node, 1);
|
||||
|
||||
expect(list.peekFront()).toBe(1);
|
||||
expect(list.peekBack()).toBe(2);
|
||||
expect(list.length).toBe(2);
|
||||
// new node becomes the head with no prev
|
||||
expect(list.head).toBe(inserted);
|
||||
expect(inserted.prev).toBeUndefined();
|
||||
});
|
||||
|
||||
it('should insert before middle node', () => {
|
||||
@@ -202,10 +213,13 @@ describe('LinkedList', () => {
|
||||
const list = new LinkedList<number>();
|
||||
const node = list.pushBack(1);
|
||||
|
||||
list.insertAfter(node, 2);
|
||||
const inserted = list.insertAfter(node, 2);
|
||||
|
||||
expect(list.peekFront()).toBe(1);
|
||||
expect(list.peekBack()).toBe(2);
|
||||
// new node becomes the tail with no next
|
||||
expect(list.tail).toBe(inserted);
|
||||
expect(inserted.next).toBeUndefined();
|
||||
expect(list.length).toBe(2);
|
||||
});
|
||||
|
||||
|
||||
@@ -209,5 +209,17 @@ describe('PriorityQueue', () => {
|
||||
expect(pq.dequeue()).toBe(10);
|
||||
expect(pq.dequeue()).toBeUndefined();
|
||||
});
|
||||
|
||||
it('accept a new element after dequeue frees a slot in a full queue', () => {
|
||||
const pq = new PriorityQueue([1, 2], { maxSize: 2 });
|
||||
|
||||
expect(pq.isFull).toBe(true);
|
||||
expect(() => pq.enqueue(3)).toThrow(RangeError);
|
||||
|
||||
pq.dequeue();
|
||||
expect(pq.isFull).toBe(false);
|
||||
expect(() => pq.enqueue(3)).not.toThrow();
|
||||
expect(pq.length).toBe(2);
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { Queue } from '.';
|
||||
|
||||
describe('queue', () => {
|
||||
@@ -87,7 +87,7 @@ describe('queue', () => {
|
||||
expect(queue.dequeue()).toBeUndefined();
|
||||
});
|
||||
|
||||
it('compact internal storage after many dequeues', () => {
|
||||
it('keep correct length and front element after many enqueue/dequeue cycles', () => {
|
||||
const queue = new Queue<number>();
|
||||
|
||||
for (let i = 0; i < 100; i++)
|
||||
@@ -99,6 +99,17 @@ describe('queue', () => {
|
||||
expect(queue.length).toBe(20);
|
||||
expect(queue.peek()).toBe(80);
|
||||
});
|
||||
|
||||
it('report isFull and free a slot after dequeue', () => {
|
||||
const queue = new Queue<number>(undefined, { maxSize: 2 });
|
||||
queue.enqueue(1).enqueue(2);
|
||||
|
||||
expect(queue.isFull).toBe(true);
|
||||
|
||||
queue.dequeue();
|
||||
expect(queue.isFull).toBe(false);
|
||||
expect(() => queue.enqueue(3)).not.toThrow();
|
||||
});
|
||||
});
|
||||
|
||||
describe('peek', () => {
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { Stack } from '.';
|
||||
|
||||
describe('stack', () => {
|
||||
@@ -33,6 +33,26 @@ describe('stack', () => {
|
||||
expect(stack.length).toBe(0);
|
||||
expect(stack.isFull).toBe(false);
|
||||
});
|
||||
|
||||
it('keep a falsy single initial value', () => {
|
||||
expect(new Stack(0).length).toBe(1);
|
||||
expect(new Stack(0).peek()).toBe(0);
|
||||
expect(new Stack('').peek()).toBe('');
|
||||
});
|
||||
|
||||
it('copy the initial array (no aliasing of the caller array)', () => {
|
||||
const initialValues = [1, 2, 3];
|
||||
const stack = new Stack(initialValues);
|
||||
|
||||
initialValues.push(4);
|
||||
|
||||
expect(stack.length).toBe(3);
|
||||
expect([...stack]).toEqual([3, 2, 1]);
|
||||
});
|
||||
|
||||
it('throw when initial values exceed maxSize', () => {
|
||||
expect(() => new Stack([1, 2, 3], { maxSize: 2 })).toThrow(RangeError);
|
||||
});
|
||||
});
|
||||
|
||||
describe('push', () => {
|
||||
@@ -51,6 +71,16 @@ describe('stack', () => {
|
||||
|
||||
expect(() => stack.push(2)).toThrow(new RangeError('Stack is full'));
|
||||
});
|
||||
|
||||
it('report isFull at the boundary', () => {
|
||||
const stack = new Stack<number>(undefined, { maxSize: 2 });
|
||||
stack.push(1).push(2);
|
||||
|
||||
expect(stack.isFull).toBe(true);
|
||||
|
||||
stack.pop();
|
||||
expect(stack.isFull).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
describe('pop', () => {
|
||||
@@ -97,6 +127,22 @@ describe('stack', () => {
|
||||
});
|
||||
});
|
||||
|
||||
describe('toArray / toString', () => {
|
||||
it('return elements in LIFO order as a distinct array', () => {
|
||||
const stack = new Stack([1, 2, 3]);
|
||||
const arr = stack.toArray();
|
||||
|
||||
expect(arr).toEqual([3, 2, 1]);
|
||||
|
||||
arr.push(99);
|
||||
expect(stack.length).toBe(3);
|
||||
});
|
||||
|
||||
it('stringify in LIFO order', () => {
|
||||
expect(new Stack([1, 2, 3]).toString()).toBe('3,2,1');
|
||||
});
|
||||
});
|
||||
|
||||
describe('iteration', () => {
|
||||
it('iterate over the stack in LIFO order', () => {
|
||||
const stack = new Stack<number>([1, 2, 3]);
|
||||
|
||||
@@ -1,4 +1,3 @@
|
||||
import { last } from '../../arrays';
|
||||
import { isArray } from '../../types';
|
||||
import type { StackLike } from './types';
|
||||
|
||||
@@ -43,7 +42,17 @@ export class Stack<T> implements StackLike<T> {
|
||||
*/
|
||||
constructor(initialValues?: T[] | T, options?: StackOptions) {
|
||||
this.maxSize = options?.maxSize ?? Infinity;
|
||||
this.stack = isArray(initialValues) ? initialValues : initialValues ? [initialValues] : [];
|
||||
|
||||
// Copy the input so external mutation can't corrupt internal state, and use an
|
||||
// explicit nullish check so falsy single values (0, '', false) are not dropped.
|
||||
const values = isArray(initialValues)
|
||||
? initialValues.slice()
|
||||
: initialValues !== null && initialValues !== undefined ? [initialValues] : [];
|
||||
|
||||
if (values.length > this.maxSize)
|
||||
throw new RangeError('Stack: initial values exceed maxSize');
|
||||
|
||||
this.stack = values;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -67,7 +76,7 @@ export class Stack<T> implements StackLike<T> {
|
||||
* @returns {boolean} `true` if the stack is full, `false` otherwise
|
||||
*/
|
||||
public get isFull() {
|
||||
return this.stack.length === this.maxSize;
|
||||
return this.stack.length >= this.maxSize;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -98,10 +107,9 @@ export class Stack<T> implements StackLike<T> {
|
||||
* @returns {T | undefined} The top element of the stack
|
||||
*/
|
||||
public peek() {
|
||||
if (this.isEmpty)
|
||||
return undefined;
|
||||
|
||||
return last(this.stack);
|
||||
// Direct index preserves a legitimately stored `undefined`/`null` top and
|
||||
// returns `undefined` for an empty stack (noUncheckedIndexedAccess).
|
||||
return this.stack[this.stack.length - 1];
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -138,8 +146,10 @@ export class Stack<T> implements StackLike<T> {
|
||||
*
|
||||
* @returns {IterableIterator<T>}
|
||||
*/
|
||||
public [Symbol.iterator]() {
|
||||
return this.toArray()[Symbol.iterator]();
|
||||
public* [Symbol.iterator]() {
|
||||
// Lazy reverse walk — no eager reversed-copy allocation.
|
||||
for (let i = this.stack.length - 1; i >= 0; i--)
|
||||
yield this.stack[i]!;
|
||||
}
|
||||
|
||||
/**
|
||||
@@ -148,8 +158,7 @@ export class Stack<T> implements StackLike<T> {
|
||||
* @returns {AsyncIterableIterator<T>}
|
||||
*/
|
||||
public async* [Symbol.asyncIterator]() {
|
||||
for (const element of this.toArray()) {
|
||||
yield element;
|
||||
}
|
||||
for (let i = this.stack.length - 1; i >= 0; i--)
|
||||
yield this.stack[i]!;
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect, beforeEach, vi } from 'vitest';
|
||||
import { beforeEach, describe, expect, it, vi } from 'vitest';
|
||||
import { SyncMutex } from '.';
|
||||
|
||||
describe('SyncMutex', () => {
|
||||
@@ -91,4 +91,21 @@ describe('SyncMutex', () => {
|
||||
|
||||
expect(mutex.isLocked).toBe(false);
|
||||
});
|
||||
|
||||
it('releases the lock and rethrows when the callback throws synchronously', async () => {
|
||||
await expect(mutex.execute(() => {
|
||||
throw new Error('boom');
|
||||
})).rejects.toThrow('boom');
|
||||
|
||||
expect(mutex.isLocked).toBe(false);
|
||||
|
||||
// The mutex must still be usable afterwards.
|
||||
await expect(mutex.execute(() => Promise.resolve('ok'))).resolves.toBe('ok');
|
||||
});
|
||||
|
||||
it('releases the lock and rejects when the callback returns a rejecting promise', async () => {
|
||||
await expect(mutex.execute(() => Promise.reject(new Error('async boom')))).rejects.toThrow('async boom');
|
||||
|
||||
expect(mutex.isLocked).toBe(false);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -37,9 +37,14 @@ export class SyncMutex {
|
||||
return;
|
||||
|
||||
this.lock();
|
||||
const result = await callback();
|
||||
this.unlock();
|
||||
|
||||
return result;
|
||||
// try/finally guarantees the lock is released even if the callback throws or
|
||||
// rejects — otherwise a single failure would wedge the guarded section forever.
|
||||
try {
|
||||
return await callback();
|
||||
}
|
||||
finally {
|
||||
this.unlock();
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@@ -1,4 +1,3 @@
|
||||
export * from './levenshtein-distance';
|
||||
export * from './template';
|
||||
export * from './trigram-distance';
|
||||
// TODO: Template is not implemented yet
|
||||
// export * from './template';
|
||||
|
||||
@@ -29,4 +29,15 @@ describe('levenshteinDistance', () => {
|
||||
expect(levenshteinDistance('abc', '')).toBe(3);
|
||||
expect(levenshteinDistance('', 'abc')).toBe(3);
|
||||
});
|
||||
|
||||
it('is symmetric', () => {
|
||||
expect(levenshteinDistance('kitten', 'sitting')).toBe(levenshteinDistance('sitting', 'kitten'));
|
||||
expect(levenshteinDistance('football', 'foot')).toBe(levenshteinDistance('foot', 'football'));
|
||||
});
|
||||
|
||||
it('counts UTF-16 code units (surrogate pairs count as two)', () => {
|
||||
expect(levenshteinDistance('😀', '')).toBe(2); // surrogate pair = 2 code units
|
||||
expect(levenshteinDistance('a😀b', 'a😀b')).toBe(0);
|
||||
expect(levenshteinDistance('café', 'cafe')).toBe(1);
|
||||
});
|
||||
});
|
||||
|
||||
@@ -15,32 +15,34 @@ export function levenshteinDistance(left: string, right: string): number {
|
||||
if (left.length === 0) return right.length;
|
||||
if (right.length === 0) return left.length;
|
||||
|
||||
// Create empty edit distance matrix for all possible modifications of
|
||||
// substrings of left to substrings of right
|
||||
const distanceMatrix = Array(right.length + 1).fill(null).map(() => Array(left.length + 1).fill(null));
|
||||
// Iterate with the shorter string as the inner dimension so the rolling rows are
|
||||
// O(min(m, n)) memory instead of a full O(m * n) matrix.
|
||||
const outer = left.length >= right.length ? left : right;
|
||||
const inner = left.length >= right.length ? right : left;
|
||||
const innerLength = inner.length;
|
||||
|
||||
// Fill the first row of the matrix
|
||||
// If this is the first row, we're transforming from an empty string to left
|
||||
// In this case, the number of operations equals the length of left substring
|
||||
for (let i = 0; i <= left.length; i++)
|
||||
distanceMatrix[0]![i]! = i;
|
||||
// prev = previous row; current = row being computed. prev starts as the base row [0..innerLength].
|
||||
let prev = Array.from({ length: innerLength + 1 }, (_, i) => i);
|
||||
let current = Array.from<number>({ length: innerLength + 1 });
|
||||
|
||||
// Fill the first column of the matrix
|
||||
// If this is the first column, we're transforming empty string to right
|
||||
// In this case, the number of operations equals the length of right substring
|
||||
for (let j = 0; j <= right.length; j++)
|
||||
distanceMatrix[j]![0]! = j;
|
||||
for (let i = 1; i <= outer.length; i++) {
|
||||
current[0] = i;
|
||||
const outerChar = outer[i - 1];
|
||||
|
||||
for (let j = 1; j <= right.length; j++) {
|
||||
for (let i = 1; i <= left.length; i++) {
|
||||
const indicator = left[i - 1] === right[j - 1] ? 0 : 1;
|
||||
distanceMatrix[j]![i]! = Math.min(
|
||||
distanceMatrix[j]![i - 1]! + 1, // deletion
|
||||
distanceMatrix[j - 1]![i]! + 1, // insertion
|
||||
distanceMatrix[j - 1]![i - 1]! + indicator, // substitution
|
||||
for (let j = 1; j <= innerLength; j++) {
|
||||
const cost = outerChar === inner[j - 1] ? 0 : 1;
|
||||
current[j]! = Math.min(
|
||||
prev[j]! + 1, // insertion
|
||||
current[j - 1]! + 1, // deletion
|
||||
prev[j - 1]! + cost, // substitution
|
||||
);
|
||||
}
|
||||
|
||||
// Swap the rolling rows; the freshly computed row becomes `prev` for the next iteration.
|
||||
const next = prev;
|
||||
prev = current;
|
||||
current = next;
|
||||
}
|
||||
|
||||
return distanceMatrix[right.length]![left.length]!;
|
||||
return prev[innerLength]!;
|
||||
}
|
||||
|
||||
@@ -1,7 +1,8 @@
|
||||
import { describe, expectTypeOf, it } from 'vitest';
|
||||
import type { ClearPlaceholder, ExtractPlaceholders } from './index';
|
||||
import type { ClearPlaceholder, ExtractPlaceholders, GenerateTypes } from './index';
|
||||
import { templateObject } from './index';
|
||||
|
||||
describe.skip('template', () => {
|
||||
describe('template', () => {
|
||||
describe('ClearPlaceholder', () => {
|
||||
it('ignores strings without braces', () => {
|
||||
type actual = ClearPlaceholder<'name'>;
|
||||
@@ -102,4 +103,36 @@ describe.skip('template', () => {
|
||||
expectTypeOf<actual>().toEqualTypeOf<expected>();
|
||||
});
|
||||
});
|
||||
|
||||
describe('GenerateTypes', () => {
|
||||
type Shape = GenerateTypes<'user.name', string>;
|
||||
|
||||
it('accepts a fully-matching shape', () => {
|
||||
expectTypeOf<{ user: { name: 'John' } }>().toExtend<Shape>();
|
||||
});
|
||||
|
||||
it('accepts missing keys (every key is optional)', () => {
|
||||
expectTypeOf<{ unrelated: number }>().toExtend<Shape>();
|
||||
});
|
||||
|
||||
it('accepts extra keys (objects stay open)', () => {
|
||||
expectTypeOf<{ user: { name: 'John' }; extra: number }>().toExtend<Shape>();
|
||||
});
|
||||
|
||||
it('rejects a mistyped leaf value', () => {
|
||||
expectTypeOf<{ user: { name: number } }>().not.toExtend<Shape>();
|
||||
});
|
||||
});
|
||||
|
||||
describe('templateObject', () => {
|
||||
it('always returns a string', () => {
|
||||
expectTypeOf(templateObject('Hello, {name}!', { name: 'John' })).toEqualTypeOf<string>();
|
||||
expectTypeOf(templateObject('Hi {user.name}', { user: { name: 'John' } })).toEqualTypeOf<string>();
|
||||
});
|
||||
|
||||
it('accepts a string or factory fallback', () => {
|
||||
expectTypeOf(templateObject('Hello, {name}!', {}, 'Guest')).toEqualTypeOf<string>();
|
||||
expectTypeOf(templateObject('Hello, {name}!', {}, key => `<${key}>`)).toEqualTypeOf<string>();
|
||||
});
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,15 +1,15 @@
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { templateObject } from '.';
|
||||
|
||||
describe.skip('templateObject', () => {
|
||||
it('replace template placeholders with corresponding values from args', () => {
|
||||
describe('templateObject', () => {
|
||||
it('replace an indexed array placeholder', () => {
|
||||
const template = 'Hello, {names.0}!';
|
||||
const args = { names: ['John'] };
|
||||
const result = templateObject(template, args);
|
||||
expect(result).toBe('Hello, John!');
|
||||
});
|
||||
|
||||
it('replace template placeholders with corresponding values from args', () => {
|
||||
it('replace a simple key placeholder', () => {
|
||||
const template = 'Hello, {name}!';
|
||||
const args = { name: 'John' };
|
||||
const result = templateObject(template, args);
|
||||
@@ -45,4 +45,23 @@ describe.skip('templateObject', () => {
|
||||
|
||||
expect(result).toBe('Hello {John Doe, your address 123 Main St');
|
||||
});
|
||||
|
||||
it('replace a missing placeholder with an empty string by default', () => {
|
||||
expect(templateObject('Hello, {name}!', {})).toBe('Hello, !');
|
||||
});
|
||||
|
||||
it('render falsy-but-present values (0, false, empty string)', () => {
|
||||
expect(templateObject('count: {n}', { n: 0 })).toBe('count: 0');
|
||||
expect(templateObject('flag: {b}', { b: false })).toBe('flag: false');
|
||||
expect(templateObject('s:{s}.', { s: '' })).toBe('s:.');
|
||||
});
|
||||
|
||||
it('trim whitespace inside the braces', () => {
|
||||
expect(templateObject('Hi { name }!', { name: 'Jo' })).toBe('Hi Jo!');
|
||||
});
|
||||
|
||||
it('leave a template without placeholders untouched', () => {
|
||||
expect(templateObject('no placeholders here', {})).toBe('no placeholders here');
|
||||
expect(templateObject('', {})).toBe('');
|
||||
});
|
||||
});
|
||||
|
||||
@@ -1,6 +1,6 @@
|
||||
import type { Collection, Path, PathToPartialType, Stringable, Trim, UnionToIntersection } from '../../types';
|
||||
import { get } from '../../collections';
|
||||
import { isFunction } from '../../types';
|
||||
import type { Collection, Path, PathToType, Stringable, Trim, UnionToIntersection } from '../../types';
|
||||
|
||||
/**
|
||||
* Type of a value that will be used to replace a placeholder in a template.
|
||||
@@ -52,23 +52,45 @@ export type ExtractPlaceholders<In extends string>
|
||||
* type Base = GenerateTypes<'Hello {user.name}, your address {user.addresses.0.street}'>; // { user: { name: string; addresses: { 0: { street: string; }; }; }; }
|
||||
* type WithTarget = GenerateTypes<'Hello {user.age}', number>; // { user: { age: number; }; }
|
||||
*/
|
||||
export type GenerateTypes<T extends string, Target = string> = UnionToIntersection<PathToType<Path<T>, Target>>;
|
||||
export type GenerateTypes<T extends string, Target = string>
|
||||
// No placeholders (T is never) → impose no shape on the args object.
|
||||
= [T] extends [never]
|
||||
? Collection
|
||||
: UnionToIntersection<PathToPartialType<Path<T>, Target>>;
|
||||
|
||||
/**
|
||||
* @name templateObject
|
||||
* @category Text
|
||||
* @description Replace `{path}` placeholders in a template string with values
|
||||
* resolved from `args` by dot-path. Placeholder keys are inferred from the
|
||||
* template, so `args` is type-checked and auto-completed against them.
|
||||
*
|
||||
* @param {string} template - Template string with `{path}` placeholders
|
||||
* @param {object} args - Source values, keyed by the placeholder paths
|
||||
* @param {string | ((key: string) => string)} [fallback] - Value (or factory) used when a placeholder cannot be resolved; defaults to an empty string
|
||||
* @returns {string} The interpolated string
|
||||
*
|
||||
* @example
|
||||
* templateObject('Hello, {name}!', { name: 'John' }); // 'Hello, John!'
|
||||
* templateObject('Hi {user.addresses.0.city}', { user: { addresses: [{ city: 'NY' }] } }); // 'Hi NY'
|
||||
* templateObject('Hello, {name}!', {}, 'Guest'); // 'Hello, Guest!'
|
||||
* templateObject('Hello, {name}!', {}, key => `<${key}>`); // 'Hello, <name>!'
|
||||
*
|
||||
* @since 0.0.4
|
||||
*/
|
||||
export function templateObject<
|
||||
T extends string,
|
||||
A extends GenerateTypes<ExtractPlaceholders<T>, TemplateValue> & Collection,
|
||||
>(template: T, args: A, fallback?: TemplateFallback) {
|
||||
return template.replace(TEMPLATE_PLACEHOLDER, (_, key) => {
|
||||
const value = get(args, key)?.toString();
|
||||
return value !== undefined ? value : (isFunction(fallback) ? fallback(key) : '');
|
||||
>(template: T, args: A, fallback?: TemplateFallback): string {
|
||||
return template.replace(TEMPLATE_PLACEHOLDER, (_match, key: string) => {
|
||||
const value = get(args, key);
|
||||
|
||||
if (value !== null && value !== undefined)
|
||||
return String(value);
|
||||
|
||||
if (isFunction<(key: string) => string>(fallback))
|
||||
return fallback(key);
|
||||
|
||||
return fallback ?? '';
|
||||
});
|
||||
}
|
||||
|
||||
templateObject('Hello {user.name}, your address {user.addresses.0.city}', {
|
||||
user: {
|
||||
name: 'John',
|
||||
addresses: [
|
||||
{ city: 'Kolpa' },
|
||||
],
|
||||
},
|
||||
});
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { trigramDistance, trigramProfile } from '.';
|
||||
|
||||
describe('trigramProfile', () => {
|
||||
@@ -66,6 +66,13 @@ describe('trigramDistance', () => {
|
||||
expect(trigramDistance(profile1, profile2)).toBe(1);
|
||||
});
|
||||
|
||||
it('is symmetric', () => {
|
||||
const a = trigramProfile('hello world');
|
||||
const b = trigramProfile('hello lorem');
|
||||
|
||||
expect(trigramDistance(a, b)).toBe(trigramDistance(b, a));
|
||||
});
|
||||
|
||||
it('one for empty text and non-empty text', () => {
|
||||
const profile1 = trigramProfile('hello world');
|
||||
const profile2 = trigramProfile('');
|
||||
|
||||
@@ -1,4 +1,4 @@
|
||||
import { describe, it, expect } from 'vitest';
|
||||
import { describe, expect, it } from 'vitest';
|
||||
import { toString } from './casts';
|
||||
|
||||
describe('casts', () => {
|
||||
|
||||
Some files were not shown because too many files have changed in this diff Show More
Reference in New Issue
Block a user