How to transpile a js file from the command line with babel

const f = () => { // < Should be transpiled
    const a = { a:1 };
    const b = { ...a }; // < Should be transpiled

    console.log('f running '+ JSON.stringify(b));
};

f();

Command Line

npx babel a.js --out-dir ./tmp-fred --ignore spec.js,test.js

The file .babelrc.js should be executed. With Babel v7 it is recommended to use the file babel.config.js, to apply to the transpilation rules to every folder including folder from node_modules, if some libraries need to be transpiled.

Links

• About babel and webpack A short and simple guide to Babel
• Web Pack Documentation
• Babel Documentation