const { readFile, writeFile, exists } = require('mz/fs'); const main = require('apr-main'); const forEach = require('apr-for-each'); const find = require('apr-find'); const path = require('path'); const ROOT = path.join(__dirname, '../node_modules/react-scripts/config'); const configs = ['webpack.config.dev', 'webpack.config.prod']; const toCopy = [ 'patch-webpack-config', 'webpack.config.dev', 'webpack.config.prod' ]; const backup = async file => { const backupPath = path.join(ROOT, `${file}.original.js`); const backupExists = await exists(backupPath); if (backupExists) { return; } const originalPath = path.join(ROOT, `${file}.js`); const orignalConfig = await readFile(originalPath, 'utf-8'); return writeFile(backupPath, orignalConfig); }; const copy = async file => { const srcPath = path.join(__dirname, `${file}.js`); const destPath = path.join(ROOT, `${file}.js`); const src = await readFile(srcPath, 'utf-8'); return writeFile(destPath, src); }; main( (async () => { await forEach(configs, backup); await forEach(toCopy, copy); })() );