| 1 | # intl-locales-supported
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| 2 |
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| 3 | Utility to help you determine if your runtime has modern Intl API & locales support. This specifically checks for `Intl.NumberFormat`, `Intl.PluralRules` & `Intl.RelativeTimeFormat` and is being used by `react-intl`.
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| 4 |
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| 5 | [](https://www.npmjs.org/package/intl-locales-supported)
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| 6 | 
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| 7 |
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| 8 | ## Usage
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| 9 |
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| 10 | ```js
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| 11 | const areIntlLocalesSupported = require('intl-locales-supported');
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| 12 |
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| 13 | const localesMyAppSupports = [
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| 14 | /* list locales here */
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| 15 | ];
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| 16 |
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| 17 | // Determine if the built-in `Intl` has the locale data we need.
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| 18 | if (!areIntlLocalesSupported(localesMyAppSupports)) {
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| 19 | // `Intl` exists, but it doesn't have the data we need, so load the
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| 20 | // polyfill and replace the constructors we need with the polyfill's.
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| 21 | require('@formatjs/intl-pluralrules/polyfill');
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| 22 | require('@formatjs/intl-pluralrules/dist/locale-data/de'); // Load de
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| 23 |
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| 24 | require('@formatjs/intl-relativetimeformat/polyfill');
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| 25 | require('@formatjs/intl-relativetimeformat/dist/locale-data/de'); // Load de
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| 26 | }
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| 27 | ```
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