metro.config.js

const {getDefaultConfig} = require('expo/metro-config');
const MetroSymlinksResolver = require('@rnx-kit/metro-resolver-symlinks');

module.exports = (async () => {
  const {
    resolver: {sourceExts, assetExts},
  } = await getDefaultConfig(__dirname);
  return {
    transformer: {
      getTransformOptions: async () => ({
        transform: {
          experimentalImportSupport: false,
          inlineRequires: true,
        },
      }),
      babelTransformerPath: require.resolve('react-native-svg-transformer'),
      minifierConfig: {
        keep_classnames: true, // enable to fix typeorm
        keep_fnames: true, // enable to fix typeorm
        mangle: {
          toplevel: false,
          keep_classnames: true, // enable to fix typeorm
          keep_fnames: true, // enable to fix typeorm
        },
        output: {
          ascii_only: true,
          quote_style: 3,
          wrap_iife: true,
        },
        sourceMap: {
          includeSources: false,
        },
        toplevel: false,
        compress: {
          reduce_funcs: false,
        },
      },
    },
    resolver: {
      resolveRequest: MetroSymlinksResolver(),
      assetExts: assetExts.filter(ext => ext !== 'svg'),
      sourceExts: [...sourceExts, 'svg', 'cjs', 'json'],
      extraNodeModules: {
        stream: require.resolve('readable-stream'),
        crypto: require.resolve('@sphereon/isomorphic-webcrypto'),
      },
    },
  };
})();