browser-polyfills

browser-polyfills

Minimal polyfills for modern browser applications

What does it have

This polyfill contains the following polyfills:

• Promise
• fetch
• Map
• Set
• Array.find
• Array.findIndex
• Array.from
• Object.values
• Object.assign
• requestAnimationFrame (rAF)

How to use

Just import it at the beginning of your application and go wild.

import 'browser-polyfills';

Note that this package will only polyfill what your browser environment does not have. For example, if the user's browser has fetch, this package will not add the polyfill and your application will keep using the browser's native code.

Enhancements

This package fine-tunes some aspects of the polyfilled packages. Note that the enhancements described here are done in spite of the browser's support (i.e. if fetch is supported by the browser, the enhancement will still be applied).

fetch

Both native and polyfilled fetch functions have a major inconsistency related to the function's outcome. Basically fetch can either return a Promise when successfully communicates with the server, or throws an error when it cannot. This inconsistency can easily lead to repeated or bloated code and/or unhandled errors. This package prevents this inconsistency and forces fetch to always return a Promise. I.e. instead of throwing an error, fetch will return a rejected Promise, to be handled like any Promise would - with a catch.