7d038dfef1
This updates old examples to the more universal `npx` command. Fixes https://github.com/vercel/next.js/discussions/12103
77 lines
3.4 KiB
Markdown
77 lines
3.4 KiB
Markdown
# Example app with [React Intl][]
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This example app shows how to integrate [React Intl][] with Next.
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## How to use
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### Using `create-next-app`
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Execute [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app) with [npm](https://docs.npmjs.com/cli/init) or [Yarn](https://yarnpkg.com/lang/en/docs/cli/create/) to bootstrap the example:
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```bash
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npx create-next-app --example with-react-intl with-react-intl-app
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# or
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yarn create next-app --example with-react-intl with-react-intl-app
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```
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### Download manually
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Download the example:
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```bash
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curl https://codeload.github.com/vercel/next.js/tar.gz/canary | tar -xz --strip=2 next.js-canary/examples/with-react-intl
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cd with-react-intl
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```
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Install it and run:
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```bash
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npm install
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npm run dev
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# or
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yarn
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yarn dev
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```
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Deploy it to the cloud with [Vercel](https://vercel.com/import?filter=next.js&utm_source=github&utm_medium=readme&utm_campaign=next-example) ([Documentation](https://nextjs.org/docs/deployment)).
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### Features of this example app
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- Server-side language negotiation
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- React Intl locale data loading via `pages/_document.js` customization
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- React Intl integration with [custom App](https://github.com/vercel/next.js#custom-app) component
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- `<IntlProvider>` creation with `locale`, `messages` props
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- Default message extraction via `babel-plugin-react-intl` integration
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- Translation management via build script and customized Next server
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### Translation Management
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This app stores translations and default strings in the `lang/` dir. This dir has `.messages/` subdir which is where React Intl's Babel plugin outputs the default messages it extracts from the source code. The default messages (`en.json` in this example app) is also generated by the build script. This file can then be sent to a translation service to perform localization for the other locales the app should support.
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The translated messages files that exist at `lang/*.json` are only used during production, and are automatically provided to the `<IntlProvider>`. During development the `defaultMessage`s defined in the source code are used. To prepare the example app for localization and production run the build script and start the server in production mode:
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```bash
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$ npm run build
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$ npm start
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```
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You can then switch your browser's language preferences to French and refresh the page to see the UI update accordingly.
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### FormattedHTMLMessage support (react-intl pre-v4)
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Out of the box, this example does not support the use of the `FormattedHTMLMessage` component on the server due to `DOMParser` not being present in a Node environment.
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This functionality is deprecated and has been removed as of react-intl 4.0
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If you still want to enable this feature, you should install a `DOMParser` implementation (e.g. `xmldom` or `jsdom`) and enable the polyfill in `server.js`:
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```js
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// Polyfill Node with `DOMParser` required by formatjs.
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// See: https://github.com/vercel/next.js/issues/10533
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const { DOMParser } = require('xmldom')
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global.DOMParser = DOMParser
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```
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[react intl]: https://github.com/yahoo/react-intl
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### Transpile react-intl
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According to [react-intl docs](https://github.com/formatjs/react-intl/blob/53f2c826c7b1e50ad37215ce46b5e1c6f5d142cc/docs/Getting-Started.md#esm-build), react-intl and its underlying libraries must be transpiled to support older browsers (eg IE11). This is done by [next-transpile-modules](https://www.npmjs.com/package/next-transpile-modules) in next.config.js.
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