create-broadcast-app/packages/cra-template-openba/template/src/utils/debounce.ts

Create a NextGen TV broadcast app with one command

/*
 * Copyright © 2022 Sinclair Broadcast Group
 * 
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * 
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

export const debounce = (n: number, fn: (...params: any[]) => void, immed = false) => {
  let timer: ReturnType<typeof setTimeout>;

  return function context(this: void, ...args: any[]) {
    if (timer === undefined && immed) {
      fn.apply(this, args);
    }

    clearTimeout(timer);
    timer = setTimeout(() => fn.apply(this, args), n);

    return timer;
  };
};