@repay/babel-preset

Babel preset used by @repaygithub

Usage

Install via the command line using yarn or npm

@babel/core, @babel/runtime, and core-js are peer dependencies, which means you must install them yourself.

yarn add --dev @repay/babel-preset @babel/core @babel/runtime core-js
# OR
npm install --save-dev @repay/babel-preset @babel/core @babel/runtime core-js

Add the preset to your .babelrc or equivalent

{
  "presets": ["@repay/babel-preset"]
}

EcmaScript Features Supported

• All Proposals that have reached stage-4 and are implemented by @babel/preset-env

• Class Properties (does not include private fields)

  class Accordian extends Component {
    state = { isOpen: this.props.openOnMount || false };
  
    // using assignment like below,
    // `this` references the class instance always
    toggleOpen = () =>
      this.setState(s => {
        isOpen: !s.isOpen;
      });
  }

• Object rest spread (e.g. let obj = {...props})

Polyfills

There are two options you can pass to control polyfills:

• coreJsPolyfill (default: false): When this option is true, the useBuiltIns: 'usage' option will be passed into @babel/preset-env to automatically add in only the necessary CoreJS polyfills needed.
• regeneratorPolyfill (default: false): When this option is true, the regenerator: true option will be passed into the @babel/plugin-transform-runtime plugin.