The uglify target has been deprecated. Set the top level option `forceAllTransforms: true` instead. @babel/preset-env: `DEBUG` option Using targets: { "chrome": "55" } Using modules transform: false Using plugins: transform-template-literals {} transform-literals {} transform-function-name {} transform-arrow-functions {} transform-block-scoped-functions {} transform-classes {} transform-object-super {} transform-shorthand-properties {} transform-duplicate-keys {} transform-computed-properties {} transform-for-of {} transform-sticky-regex {} transform-unicode-regex {} transform-spread {} transform-parameters {} transform-destructuring {} transform-block-scoping {} transform-typeof-symbol {} transform-new-target {} transform-regenerator {} transform-exponentiation-operator {} transform-async-to-generator {} proposal-async-generator-functions { "chrome":"55" } proposal-object-rest-spread { "chrome":"55" } proposal-unicode-property-regex { "chrome":"55" } transform-dotall-regex { "chrome":"55" } Using polyfills with `entry` option: [src/in.js] Replaced `@babel/polyfill` with the following polyfills: es6.array.sort { "chrome":"55" } es7.object.define-getter { "chrome":"55" } es7.object.define-setter { "chrome":"55" } es7.object.lookup-getter { "chrome":"55" } es7.object.lookup-setter { "chrome":"55" } es7.promise.finally { "chrome":"55" } es7.symbol.async-iterator { "chrome":"55" } es7.string.pad-start { "chrome":"55" } es7.string.pad-end { "chrome":"55" } web.timers { "chrome":"55" } web.immediate { "chrome":"55" } web.dom.iterable { "chrome":"55" } 🎉 Successfully compiled 1 file with Babel.