Test which version you are running with cmd babel -V If it is not verion 7 or higher npm uninstall babel-cli -g npm uninstall babel-core -g And npm install @babel/cli -g npm install @babel/core -g If you are using Jest run npm install babel-core@7.0.0-bridge.0 –save-dev Uninstall and reinstall @babel/node solves the problem if you do … Read more
Nodemon expects it just as: nodemon –watch src server.js https://github.com/remy/nodemon#monitoring-multiple-directories nodemon –watch app –watch libs app/server.js
tl;dr If you’re on Babel 6, you can use https://www.npmjs.com/package/babel-plugin-transform-builtin-extend Extending builtin types like Array and Error and such has never been supported in Babel. It is perfectly valid in a real ES6 environment, but there are requirements to make it work that are very difficult to transpile in a way that is compatible with … Read more
Sorry I forgot to install babel-preset-react: $ npm install babel-preset-react –save-dev
Older versions of Babel came with everything out of the box. The newer version requires you install whichever plugins your setup needs. First, you’ll need to install the ES2015 preset. npm install babel-preset-es2015 –save-dev Next, you need to tell babelify to use the preset you installed. return browserify({ … }) .transform(babelify.configure({ presets: [“es2015”] })) … … Read more
Add the babel-cli and babel-preset-es2015 (aka ES6) dependencies to your app’s package.json file and define a start script: { “dependencies”: { “babel-cli”: “^6.0.0”, “babel-preset-es2015”: “^6.0.0” }, “scripts”: { “start”: “babel-node –presets es2015 app.js” } } Then you can simply execute the following command to run your app: npm start If you ever decide to stop … Read more
1) Do I need to use that useBuiltIns: “entry” option? Yes, if you want to include polyfills based on your target environment. TL;DR There’re basically 3 options for useBuiltIns: “entry”: when using this option, @babel/preset-env replaces direct imports of core-js to imports of only the specific modules required for a target environment. That means you … Read more
You should install babel-loader and babel-core as dev-dependency while npm install. npm install babel-core babel-loader –save-dev
You only need to install babel-preset-es2015: CLI usage example: npm install babel-cli babel-preset-es2015
You can require polyfill in the entry point to your code so it will get bundled up with the rest of JavaScript. One option is to use: require(‘babel-polyfill’); Or: import ‘babel-polyfill’; All of that is explained in the documentation.