@babel/helper-define-polyfill-provider

What is @babel/helper-define-polyfill-provider?

The @babel/helper-define-polyfill-provider package is part of the Babel ecosystem and is used to define a way to provide polyfills in your Babel configuration. It helps in specifying which polyfills to include based on the target environment and the features used in your code, ensuring that only necessary polyfills are added, thus optimizing the bundle size.

What are @babel/helper-define-polyfill-provider's main functionalities?

Define polyfill provider

This code sample demonstrates how to define a custom polyfill provider using the @babel/helper-define-polyfill-provider package. It specifies polyfills for 'Promise' and 'fetch' with their respective detection logic and paths to their polyfill modules.

import { createPolyfillProvider } from '@babel/helper-define-polyfill-provider';

const myPolyfillProvider = createPolyfillProvider({
  name: 'myPolyfillProvider',
  polyfills: {
    'Promise': {
      global: 'Promise',
      detection: 'Promise in global',
      path: 'core-js/modules/es.promise'
    },
    'fetch': {
      global: 'fetch',
      detection: 'fetch in global',
      path: 'whatwg-fetch'
    }
  }
});

Other packages similar to @babel/helper-define-polyfill-provider

@babel/preset-env

Similar to @babel/helper-define-polyfill-provider, @babel/preset-env is a Babel preset that allows you to specify a target environment and automatically determines the Babel plugins and polyfills you need. While @babel/preset-env is more comprehensive and widely used for setting up Babel configurations, @babel/helper-define-polyfill-provider offers more granular control over polyfill definitions.

core-js

Core-js is a modular standard library for JavaScript, including polyfills for ECMAScript up to 2021. It can be used directly or through @babel/preset-env. Unlike @babel/helper-define-polyfill-provider, which is a helper tool for defining polyfill providers, core-js provides actual implementations of polyfills and is often used as the underlying library for polyfilling in many environments.

README

@babel/helper-define-polyfill-provider

Install

Using npm:

npm install --save-dev @babel/helper-define-polyfill-provider

or using yarn:

yarn add @babel/helper-define-polyfill-provider --dev