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Intl.RelativeTimeFormat

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

npm Version size

Installation

npm i @formatjs/intl-relativetimeformat

Requirements

This package requires the following capabilities:

Usage

Via polyfill.io

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

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

Simple

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

Dynamic import + capability detection

import {shouldPolyfill} from '@formatjs/intl-relativetimeformat/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-relativetimeformat/polyfill-force')
await import(
`@formatjs/intl-relativetimeformat/locale-data/${unsupportedLocale}`
)
}

Tests

This library is fully test262-compliant.