metro.config.js

const path = require('path')
const nodeLibs = require('node-libs-react-native')
const exclusionList = require('metro-config/src/defaults/exclusionList')
const escapeStringRegexp = require('escape-string-regexp')
const isE2E = process.env.CELO_TEST_CONFIG === 'e2e'

const root = path.resolve(__dirname)
const escapedRoot = escapeStringRegexp(root)
const blist = []
const defaultSourceExts = require('metro-config/src/defaults/defaults').sourceExts
const defaultAssetExts = require('metro-config/src/defaults/defaults').assetExts

module.exports = {
  transformer: {
    getTransformOptions: async () => ({
      transform: {
        experimentalImportSupport: false,
        inlineRequires: true,
      },
    }),
  },
  resolver: {
    assetExts: [...defaultAssetExts, 'txt'],
    blacklistRE: exclusionList(
      isE2E ? blist : blist.concat([RegExp(`${escapedRoot}\/e2e\/mocks/.*`)])
    ),
    extraNodeModules: {
      ...nodeLibs,
      fs: require.resolve('react-native-fs'),
      'isomorphic-fetch': require.resolve('cross-fetch'),
      // We don't need the `net` module for now.
      // This doesn't actually provide any implementation,
      // but avoids an error when require('net') is used (in ContractKit for instance).
      net: require.resolve('node-libs-react-native/mock/net'),
      vm: require.resolve('vm-browserify'),
    },
    sourceExts: isE2E ? ['e2e.ts', 'e2e.js'].concat(defaultSourceExts) : defaultSourceExts,
  },
  watchFolders: [root],
}