37 lines
762 B
TypeScript
37 lines
762 B
TypeScript
export function eagerDebounceAsync(fn: () => Promise<void>, delay: number) {
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let timer: ReturnType<typeof setTimeout> | null = null;
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let inFlight: Promise<void> | null = null;
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let runAfterInFlight = false;
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const run = async () => {
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if (inFlight != null) {
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runAfterInFlight = true;
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return;
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}
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runAfterInFlight = false;
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inFlight = fn()
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.catch(console.error)
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.finally(() => {
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inFlight = null;
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if (runAfterInFlight && timer == null) {
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void run();
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}
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});
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await inFlight;
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};
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return () => {
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if (timer == null) {
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void run();
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} else {
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clearTimeout(timer);
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}
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timer = setTimeout(() => {
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timer = null;
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void run();
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}, delay);
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};
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}
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