Warning, the following targets are using a decimal version: electron: 0.36 We recommend using a string for minor/patch versions to avoid numbers like 6.10 getting parsed as 6.1, which can lead to unexpected behavior. babel-preset-env: `DEBUG` option Using targets: { "electron": "0.36" } Using modules transform: commonjs Using plugins: check-es2015-constants { "electron":"0.36" } transform-es2015-block-scoping { "electron":"0.36" } transform-es2015-destructuring { "electron":"0.36" } transform-es2015-for-of { "electron":"0.36" } transform-es2015-function-name { "electron":"0.36" } transform-es2015-parameters { "electron":"0.36" } transform-es2015-sticky-regex { "electron":"0.36" } transform-es2015-unicode-regex { "electron":"0.36" } transform-regenerator { "electron":"0.36" } transform-exponentiation-operator { "electron":"0.36" } transform-async-to-generator { "electron":"0.36" } syntax-trailing-function-commas { "electron":"0.36" } Using polyfills with `entry` option: [src/in.js] Replaced `babel-polyfill` with the following polyfills: es6.typed.array-buffer { "electron":"0.36" } es6.typed.data-view { "electron":"0.36" } es6.typed.int8-array { "electron":"0.36" } es6.typed.uint8-array { "electron":"0.36" } es6.typed.uint8-clamped-array { "electron":"0.36" } es6.typed.int16-array { "electron":"0.36" } es6.typed.uint16-array { "electron":"0.36" } es6.typed.int32-array { "electron":"0.36" } es6.typed.uint32-array { "electron":"0.36" } es6.typed.float32-array { "electron":"0.36" } es6.typed.float64-array { "electron":"0.36" } es6.map { "electron":"0.36" } es6.set { "electron":"0.36" } es6.weak-map { "electron":"0.36" } es6.weak-set { "electron":"0.36" } es6.reflect.apply { "electron":"0.36" } es6.reflect.construct { "electron":"0.36" } es6.reflect.define-property { "electron":"0.36" } es6.reflect.delete-property { "electron":"0.36" } es6.reflect.get { "electron":"0.36" } es6.reflect.get-own-property-descriptor { "electron":"0.36" } es6.reflect.get-prototype-of { "electron":"0.36" } es6.reflect.has { "electron":"0.36" } es6.reflect.is-extensible { "electron":"0.36" } es6.reflect.own-keys { "electron":"0.36" } es6.reflect.prevent-extensions { "electron":"0.36" } es6.reflect.set { "electron":"0.36" } es6.reflect.set-prototype-of { "electron":"0.36" } es6.promise { "electron":"0.36" } es6.symbol { "electron":"0.36" } es6.function.name { "electron":"0.36" } es6.regexp.flags { "electron":"0.36" } es6.regexp.match { "electron":"0.36" } es6.regexp.replace { "electron":"0.36" } es6.regexp.split { "electron":"0.36" } es6.regexp.search { "electron":"0.36" } es6.array.from { "electron":"0.36" } es7.object.values { "electron":"0.36" } es7.object.entries { "electron":"0.36" } es7.object.get-own-property-descriptors { "electron":"0.36" } es7.string.pad-start { "electron":"0.36" } es7.string.pad-end { "electron":"0.36" } web.timers { "electron":"0.36" } web.immediate { "electron":"0.36" } web.dom.iterable { "electron":"0.36" } src/in.js -> lib/in.js