@lesnoypudge/utils/build/throttle/throttle.js

lesnoypudge's utils

import { noop } from "../noop/noop.js";
const throttle = (fn, delayMS) => {
  let lastArgs;
  let isBlocked = false;
  let isCalledDuringBlock = false;
  let timeoutId;
  const block = (resolve = noop) => {
    isBlocked = true;
    timeoutId = setTimeout(() => {
      isBlocked = false;
      resolve();
      if (isCalledDuringBlock) {
        fn(...lastArgs);
        block();
      }
    }, delayMS);
  };
  const reset = () => {
    clearTimeout(timeoutId);
    isBlocked = false;
    isCalledDuringBlock = false;
  };
  const wrappedFunc = (...args) => {
    return new Promise((resolve) => {
      if (!isBlocked) {
        fn(...args);
        block(resolve);
        return;
      }
      isCalledDuringBlock = true;
      lastArgs = args;
    });
  };
  const controls = {
    block,
    reset
  };
  return [
    wrappedFunc,
    controls
  ];
};
export {
  throttle
};
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