BrowserSync to detect localhost environment

functions.php

<?php

function codetot_is_localhost() {
  return !empty($_SERVER['HTTP_X_CODETOT_HEADER']) && $_SERVER['HTTP_X_CODETOT_HEADER'] === 'development';
}

webpack.config.js

  BrowserSyncConfig: {
    host: 'localhost',
    port: 3000,
    proxy: {
      target: 'http://ecom.test',
      proxyReq: [
        proxyReq => {
          proxyReq.setHeader('X-Codetot-Header', 'development')
        }
      ]
    },
    open: false,
    files: [
      '**/*.php',
      'assets/js/**/*.js',
      'assets/css/**/*.css',
      'assets/svg/**/*.svg',
      'assets/img/**/*.{jpg,jpeg,png,gif}',
      'assets/fonts/**/*.{eot,ttf,woff,woff2,svg}',
      'src/**/*.css',
      'src/**/*.js'
    ]
  },