Create decoratorUtils for debouncing

Dependencies

• [2] IBRKAWNM Moved utility modules into their own folder

Change contents

• file addition: decoratorUtils.ts (-xw-x--x--)
  [2.135]
  + /**

  + * Converts a simplified decorator to a proper decorator function

  + * @param decorator The simplified decorator function

  + */

  + function decorate (decorator: (fn: Function, key: string) => Function): Function {

  + return (_target: any, key: string, descriptor: any) => {

  + let fnKey: string | null = null;

  + let fn: Function | null = null;

  +

  + if (typeof descriptor.value === 'function') {

  + fnKey = 'value';

  + fn = descriptor.value;

  + } else if (typeof descriptor.get === 'function') {

  + fnKey = 'get';

  + fn = descriptor.get;

  + }

  +

  + if (!fn || !fnKey) {

  + throw new Error('not supported');

  + }

  +

  + descriptor[fnKey] = decorator(fn, key);

  + };

  + }

  +

  + /**

  + * Prevents a function or method from being called multiple times

  + * within a given window, delaying the execution by the given delay.

  + * @param delay The minimum amount of time between function calls

  + */

  + export function debounce (delay: number): Function {

  + return decorate((fn, key) => {

  + const timerKey = `$debounce$${key}`;

  +

  + return function (this: any, ...args: any[]) {

  + clearTimeout(this[timerKey]);

  + this[timerKey] = setTimeout(() => fn.apply(this, args), delay);

  + };

  + });

  + }