react-native/Libraries/Core/setUpDeveloperTools.js

A framework for building native apps using React

/**
 * Copyright (c) Meta Platforms, Inc. and affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 *
 * @flow strict-local
 * @format
 */

import Platform from '../Utilities/Platform';

declare var console: {[string]: $FlowFixMe};

/**
 * Sets up developer tools for React Native.
 * You can use this module directly, or just require InitializeCore.
 */
if (__DEV__) {
  if (!Platform.isTesting) {
    const HMRClient = require('../Utilities/HMRClient').default;

    // TODO(T214991636): Remove legacy Metro log forwarding
    if (console._isPolyfilled) {
      // We assume full control over the console and send JavaScript logs to Metro.
      [
        'trace',
        'info',
        'warn',
        'error',
        'log',
        'group',
        'groupCollapsed',
        'groupEnd',
        'debug',
      ].forEach(level => {
        const originalFunction = console[level];
        console[level] = function (...args: $ReadOnlyArray<mixed>) {
          HMRClient.log(level, args);
          originalFunction.apply(console, args);
        };
      });
    }
  }

  require('./setUpReactRefresh');

  global[`${global.__METRO_GLOBAL_PREFIX__ ?? ''}__loadBundleAsync`] =
    require('./Devtools/loadBundleFromServer').default;
}