react-native-firebase/tests/metro.config.js

const { resolve, join } = require('path');
const { createBlacklist } = require('metro');
const { mergeConfig } = require('metro-config');
const { DEFAULT } = require('react-native/local-cli/util/Config');

// https://github.com/facebook/react-native/blob/master/local-cli/core/Constants.js
// https://github.com/facebook/react-native/blob/master/local-cli/util/Config.js

const config = {
  resolver: {
    blackListRE: createBlacklist([
      new RegExp(`^${escape(resolve(__dirname, '..', 'node_modules'))}\\/.*$`),
    ]),
    extraNodeModules: new Proxy(
      {},
      {
        get: (target, name) => join(__dirname, `node_modules/${name}`),
      }
    ),
  },
  watchFolders: [resolve(__dirname, '../src')],
  // serializer: {
  //   getModulesRunBeforeMainModule: () => [
  //     require.resolve('react-native/Libraries/Core/InitializeCore'),
  //   ],
  // },
};

module.exports = mergeConfig(DEFAULT, config);