import babelLoader from 'babel-loader' module.exports = babelLoader.custom(babel => { const presetItem = babel.createConfigItem(require('../../babel/preset'), {type: 'preset'}) const reactJsxSourceItem = babel.createConfigItem(require('@babel/plugin-transform-react-jsx-source'), {type: 'plugin'}) const configs = new Set() return { customOptions (opts) { const custom = { isServer: opts.isServer, dev: opts.dev } const loader = Object.assign({ cacheDirectory: true }, opts) delete loader.isServer delete loader.dev return { loader, custom } }, config (cfg, {customOptions: {isServer, dev}}) { const options = Object.assign({}, cfg.options) if (cfg.hasFilesystemConfig()) { for (const file of [cfg.babelrc, cfg.config]) { // We only log for client compilation otherwise there will be double output if (file && !isServer && !configs.has(file)) { configs.add(file) console.log(`> Using external babel configuration`) console.log(`> Location: "${file}"`) } } } else { // Add our default preset if the no "babelrc" found. options.presets = [...options.presets, presetItem] } options.plugins = [ ...options.plugins, dev && reactJsxSourceItem ].filter(Boolean) return options } } })