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fix : trailing call fires unconditionally in throttle utility #3234

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fix : trailing call fires unconditionally in throttle utility #3234

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7 changes: 6 additions & 1 deletion packages/core/src/utils/throttle.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -27,23 +27,28 @@ export function throttle<T extends (...args: unknown[]) => void>(
const leading = options?.leading ?? true;
let timer: ReturnType<typeof setTimeout> | undefined;
let lastArgs: Parameters<T> | undefined;
let hasNewCalls = false;

const throttled = function (...args: Parameters<T>) {
lastArgs = args;
if (!timer) {
if (leading) func(...args);
timer = setTimeout(() => {
timer = undefined;
if (lastArgs !== args || !leading) func(...lastArgs!);
if (hasNewCalls || !leading) func(...lastArgs!);
lastArgs = undefined;
hasNewCalls = false;
}, wait);
} else {
hasNewCalls = true;
}
} as T & { cancel: () => void };

throttled.cancel = () => {
clearTimeout(timer);
timer = undefined;
lastArgs = undefined;
hasNewCalls = false;
};

return throttled;
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