robonen
96f4cba4a8
- 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).
35 lines
942 B
TypeScript
35 lines
942 B
TypeScript
import { describe, expect, it } from 'vitest';
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import { pipe } from '.';
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describe('pipe', () => {
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it('apply functions left-to-right', () => {
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const calc = pipe((n: number) => n + 1, n => n * 2, n => `= ${n}`);
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expect(calc(3)).toBe('= 8');
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});
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it('pass multiple arguments to the first function', () => {
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const calc = pipe((a: number, b: number) => a + b, n => n * 10);
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expect(calc(2, 3)).toBe(50);
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});
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it('support a single function', () => {
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const inc = pipe((n: number) => n + 1);
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expect(inc(1)).toBe(2);
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});
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it('preserve this for the first function', () => {
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const calc = pipe(function (this: { base: number }, n: number) {
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return this.base + n;
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}, n => n * 2);
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expect(calc.call({ base: 10 }, 5)).toBe(30);
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});
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it('return the input unchanged with no functions', () => {
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expect((pipe as unknown as (...fns: never[]) => (x: number) => number)()(42)).toBe(42);
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});
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});
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