Polyfiller

Load polyfills on demand.

Install

npm install @wide/polyfiller --save

Usage

This exemple will load assets/polyfills/object-assign.js on IE 11 only:

import polyfiller from '@wide/polyfiller'

polyfiller({
  path: 'assets/polyfills/',
  load: {
    'object-assign.js': {
      ie: '<=11'
    }
  }
})

• path public folder of compiled polyfills
• load collection of polyfills to load, accept a key/value combination
  • key: filename or url of the polyfill
  • value: criteria to satisfies (see bowser.satisfied)

Built-in polyfills

@wide/polyfiller comes with a set of well-known polyfills:

• babel.js: core-js/stable and regenerator-runtime/runtime
• closest.js: element-closest-polyfill
• object-fit.js: object-fit-images and object-fit-videos
• picture-fill.js: picturefill
• object-assign.js: es6-object-assign
• fetch: whatwg-fetch
• svg.js: svg4everybody

These polyfills can be loaded in two steps, first import the needed ones using the presets collection:

import polyfiller from '@wide/polyfiller'
import presets from '@wide/polyfiller/lib/presets'

polyfiller({
  path: 'assets/polyfills/',
  load: {
    ...preset.babel,
    ...preset.fetch,
  }
})

Then, you need to compile them into the assets/polyfills:

// assets/polyfills/babel.js
import '@wide/polyfiller/lib/presets/babel'

// assets/polyfills/fetch.js
import '@wide/polyfiller/lib/presets/fetch'

Capabilities

To resolve which polyfill must be loaded, @wide/polyfiller makes use of the bowser lib and expose the main feature of the browser:

import capabilities from '@wide/polyfiller/lib/capabilities'

capabilities.touch    // true | false
capabilities.platform // desktop | mobile
capabilities.os       // linux | macos | windows
capabilities.engine   // trident | gecko
capabilities.name     // ie | chrome | firefox
capabilities.version  // number
capabilities.chrome   // true | false
capabilities.opera    // true | false
capabilities.firefox  // true | false
capabilities.safari   // true | false
capabilities.edge     // true | false
capabilities.ie       // true | false
capabilities.webp     // true | false

These capabilities can be exposed as window.capabilities and body css classes:

import { expose } from '@wide/polyfiller/lib/capabilities'

expose()

Libraries

This package uses :

• bowser

Authors

• Aymeric Assier - github.com/myeti
• Julien Martins Da Costa - github.com/jdacosta

License

This project is licensed under the MIT License - see the licence file for details