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import { useRef } from 'react';

let uniqueId = 0;
const getUniqueId = () => uniqueId++;

export function useComponentId() {
  const idRef = useRef(getUniqueId());
  return idRef.current;
}

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import React, { Component } from 'react';

export default function withPropsChecker(WrappedComponent) {
  return class PropsChecker extends Component {
    componentWillReceiveProps(nextProps) {
      Object.keys(nextProps)
        .filter(key => {
          return nextProps[key] !== this.props[key];
        })
        .map(key => {

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function mySlowFunction(baseNumber) {
	console.time('mySlowFunction');
	let result = 0;	
	for (var i = Math.pow(baseNumber, 7); i >= 0; i--) {		
		result += Math.atan(i) * Math.tan(i);
	};
	console.timeEnd('mySlowFunction');
}

mySlowFunction(8); // higher number => more iterations => slower

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hidutil property --set '{"UserKeyMapping":[{"HIDKeyboardModifierMappingSrc":0x700000064,"HIDKeyboardModifierMappingDst":0x700000035},{"HIDKeyboardModifierMappingSrc":0x700000035,"HIDKeyboardModifierMappingDst":0x700000064}]}'

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var Q = require('q');

function batchPromises(items, fn, options) {
	var results = [];
	var index = (options.batchSize - 1);

	function getNextItem() {
		index++;
		if (items.length > index) {                
			var nextItem = items[index];

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// npm install http-proxy

var httpProxy = require('http-proxy');
var targetHost = '192.168.99.100';
var port = 8489;
httpProxy.createProxyServer({target:'http://' + targetHost + ':' + port}).listen(port);

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// Usage: jscodeshift -t replace-webpack-alias-with-relative-path.js ./kibana/x-pack/plugins ./kibana/src

const path = require('path');
const URI = require('urijs');

function getRelativePath(currentFilePath, dependencyPath) {
  return URI(dependencyPath)
    .relativeTo(currentFilePath)
    .toString();
}

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How to get the xs value from Facebook cookie with Google Chrome:

1. Open www.messenger.com
2. Open Developer Tools
3. Click "Application" tab
4. Click, "Cookies" in the left panel
5. Click "www.messenger.com"
6. Copy the value of "xs"

Word of warning

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/*
 * Run timers (setInterval/setTimeout) every tick continuously until the promise has been resolved
 */
async function runTimersUntilResolved(fn: () => Promise<any>) {
  jest.useFakeTimers();

  let isResolved = false;
  const p = fn();
  p.finally(() => (isResolved = true));

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[user]
	name = John Doe
	email = johndoe@gmail.com