Hydrock

import React, { unstable_Profiler as Profiler } from 'react';
...
const Profiler = React.unstable_Profiler;

Hydrock

import React, { Component, unstable_Profiler as Profiler } from "react";
import { render } from "react-dom";

class ComponentWithProfiling extends Component {
  state = {
    count: 0
  };

  logProfile = (id, phase, actualTime, baseTime, startTime, commitTime) => {
    console.log(`${id}'s ${phase} phase:`);

Hydrock

{
    "scripts": {
        "build": "cross-env NODE_ENV=production node app.js"
    }
}

Hydrock

set

ALLUSERSPROFILE=C:\ProgramData
APPDATA=C:\Users\user\AppData\Roaming
.
.
.
windir=C:\Windows

Hydrock

MYAPIKEY=ndsvn2g86nsb9hsg

Hydrock

const myAPIKey = process.env.MYAPIKEY;
const url = 'https://externalapi.service.com/v1/query?key=' + myAPIKey;

const result = fetch(url);

Hydrock

node
> console.log(process.env)
{ GIT_PS1_SHOWDIRTYSTATE: '1',
  NVM_RC_VERSION: '',
  ...
  ...
  ...
  _: '/usr/local/bin/node',
  __CF_USER_TEXT_ENCODING: '0x1F5:0x0:0x0' }

Hydrock

const myAPIKey = 'ndsvn2g86nsb9hsg';
const url = 'https://externalapi.service.com/v1/query?key=' + myAPIKey;

const result = fetch(url);

Hydrock

var request  = require('request-promise');

var main = function() {

  var myAPIKey = process.env.MYAPIKEY;
  
  var url = 'https://externalapi.service.com/v1/query?key=' + myAPIKey;
  
  return request(url);
};

Hydrock

var request  = require('request-promise');

var main = function() {

  var myAPIKey = 'ndsvn2g8dnsb9hsg';
  
  var url = 'https://externalapi.service.com/v1/query?key=' + myAPIKey;
  
  return request(url);
};