Babel Transpilation

Follow these steps to transpile ES6+ JavaScript code to ES5 in order to improve browser compatibility.

  1. Use npm init to create a package.json file in the root directory and give it a name and description.

  2. Install the Babel command line npm package and add it to the devDependencies property: npm install babel-cli -D

  3. Install the Babel preset environment npm package: npm install babel-preset-env -D

  4. Add a .babelrc file to the project folder: touch .babelrc

  5. In .babelrc, preset your local project’s config to "env".
     {
       "presets": ["env"]
     }
    
  6. In package.json, add the script "build": "babel src -d lib". Don’t forget to add a comma after the “test” script.

  7. Use npm run build to transpile the code in src and write it to lib.

To check browser compatibility use caniuse.com

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