The compiler for next generation JavaScript
— Read on babeljs.io/

Babel is a toolchain that is mainly used to convert ECMAScript 2015+ code into a backwards compatible version of JavaScript in current and older browsers or environments. Here are the main things Babel can do for you:

• Transform syntax
  
• Polyfill features that are missing in your target environment (through @babel/polyfill)
• Source code transformations (codemods)
  
• And more!