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).
19 lines
673 B
TypeScript
19 lines
673 B
TypeScript
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>();
|
|
});
|
|
});
|