react-native-windows/metro.config.js

React Native for Windows

/**
 * @format
 */
const fs = require('fs');
const path = require('path');

// Check that we have built our JS files before running the bundler, otherwise we'll get a harder to diagnose "Unable to resolve module" error
if (
  !fs.existsSync(
    path.resolve(
      __dirname,
      'Libraries/Components/AccessibilityInfo/AccessibilityInfo.windows.js',
    ),
  )
) {
  throw new Error(
    '\nThis package must be built before running the bundler.  Did you mean to run "yarn build" first?\n',
  );
}

const {makeMetroConfig} = require('@rnw-scripts/metro-dev-config');
module.exports = makeMetroConfig({projectRoot: __dirname});