Intl.ListFormat

A spec-compliant polyfill for Intl.ListFormat fully tested by the official ECMAScript Conformance test suite

Installation

npm

npm i @formatjs/intl-listformat

yarn

yarn add @formatjs/intl-listformat

Requirements

• Intl.getCanonicalLocales or polyfill
• Intl.Locale or polyfill.

Usage

Via polyfill-fastly.io

You can use polyfill-fastly.io URL Builder to create a polyfill script tag for Intl.ListFormat. By default the created URL does not come with any locale data. In order to add locale data, append Intl.ListFormat.~locale.<locale> to your list of features. For example:

<!-- Polyfill Intl.ListFormat, its dependencies & `en` locale data -->
<script src="https://polyfill-fastly.io/v3/polyfill.min.js?features=Intl.ListFormat,Intl.ListFormat.~locale.en"></script>

Simple

import '@formatjs/intl-listformat/polyfill'
import '@formatjs/intl-listformat/locale-data/en' // locale-data for en

Dynamic import + capability detection

import {shouldPolyfill} from '@formatjs/intl-listformat/should-polyfill'
async function polyfill(locale: string) {
  const unsupportedLocale = shouldPolyfill(locale)
  // This locale is supported
  if (!unsupportedLocale) {
    return
  }
  // Load the polyfill 1st BEFORE loading data
  await import('@formatjs/intl-listformat/polyfill-force')
  await import(`@formatjs/intl-listformat/locale-data/${unsupportedLocale}`)
}

Tests

This library is fully test262-compliant.