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66794e0549
Adds `web_src/js/utils/func.ts` with `debounce` and `throttle`, dropping
`throttle-debounce` and `perfect-debounce` dependencies. Both were
needed before: the former has no promise-returning debounce, which
`TextExpander` requires, and the latter no `throttle`.
Signature follows lodash and es-toolkit: `(func, wait, {leading,
trailing})` plus `cancel`, so argument order flips at the migrated call
sites.
75 lines
1.9 KiB
TypeScript
75 lines
1.9 KiB
TypeScript
import {debounce, throttle} from './func.ts';
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test('debounce', {concurrent: false}, () => {
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vi.useFakeTimers();
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const spy = vi.fn();
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const fn = debounce(spy, 10);
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fn();
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fn();
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fn();
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expect(spy).toHaveBeenCalledTimes(0);
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vi.advanceTimersByTime(30);
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expect(spy).toHaveBeenCalledTimes(1);
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vi.useRealTimers();
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});
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test('debounce leading', {concurrent: false}, () => {
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vi.useFakeTimers();
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const spy = vi.fn();
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const fn = debounce(spy, 10, {leading: true, trailing: false});
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fn();
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expect(spy).toHaveBeenCalledTimes(1);
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fn();
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vi.advanceTimersByTime(30);
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expect(spy).toHaveBeenCalledTimes(1);
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vi.useRealTimers();
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});
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test('debounce result', {concurrent: false}, async () => {
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vi.useFakeTimers();
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const fn = debounce((value: number) => value * 2, 10);
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const first = fn(1);
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const second = fn(2);
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vi.advanceTimersByTime(10);
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expect(await first).toEqual(4); // both calls collapse into the last one
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expect(await second).toEqual(4);
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vi.useRealTimers();
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});
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test('debounce cancel', {concurrent: false}, () => {
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vi.useFakeTimers();
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const spy = vi.fn();
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const fn = debounce(spy, 10);
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fn();
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fn.cancel();
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vi.advanceTimersByTime(30);
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expect(spy).toHaveBeenCalledTimes(0);
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vi.useRealTimers();
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});
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test('throttle', {concurrent: false}, () => {
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vi.useFakeTimers();
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const spy = vi.fn();
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const fn = throttle(spy, 10);
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fn();
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fn();
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fn();
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expect(spy).toHaveBeenCalledTimes(1); // leading
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vi.advanceTimersByTime(30);
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expect(spy).toHaveBeenCalledTimes(2); // plus one trailing for the collapsed rest
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vi.useRealTimers();
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});
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test('throttle trailing only', {concurrent: false}, () => {
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vi.useFakeTimers();
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const spy = vi.fn();
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const fn = throttle(spy, 10, {leading: false});
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fn();
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fn();
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fn();
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expect(spy).toHaveBeenCalledTimes(0);
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vi.advanceTimersByTime(30);
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expect(spy).toHaveBeenCalledTimes(1);
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vi.useRealTimers();
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});
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