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Setup with React

Learn how to add internationalization to a React application using Lingui. This guide applies to any React project, including those created with Create React App.

Installation​

  • Install @lingui/cli, @lingui/macro, babel-plugin-macros and Babel core packages as a development dependencies, and @lingui/react as a runtime dependency:

    npm install --save-dev @lingui/cli @babel/core
    npm install --save-dev @lingui/macro babel-plugin-macros
    npm install --save @lingui/react

  • Add macros plugin to Babel config (e.g: .babelrc):

    {
      "plugins": ["macros"]
    }

    When using any preset, first check if it includes the macros plugin. These presets already includes the macros plugin: react-scripts.

note

It's recommended to install @lingui/macro package as a production dependency rather than development one to avoid import/no-extraneous-dependencies errors in ESLint.

tip

Don't miss the Lingui ESLint Plugin which can help you find and prevent common l10n mistakes in your code.

Configuration​

  1. Create lingui.config.js file with LinguiJS configuration in root of your project (next to package.json). Replace src with the directory name where you have source files:

    lingui.config.js
    /** @type {import('@lingui/conf').LinguiConfig} */
    module.exports = {
      locales: ["en", "cs", "fr"],
      sourceLocale: "en",
      catalogs: [
        {
          path: "<rootDir>/src/locales/{locale}/messages",
          include: ["src"],
        },
      ],
      format: "po",
    };

    This configuration will extract messages from source files inside src directory and write them into message catalogs in src/locales (English catalog would be in e.g: src/locales/en/messages.po).

    PO format is recommended for message catalogs. See format documentation for other available formats.

  2. Add following scripts to your package.json:

    package.json
    {
      "scripts": {
        "extract": "lingui extract",
        "compile": "lingui compile"
      }
    }

See Configuration reference for more options.

tip

If you use TypeScript, you can add --typescript flag to compile script to produce compiled message catalogs with TypeScript types.

Usage​

Verify the installation by running the CLI command to extract messages from source files and update message catalogs:

npm run extract

There should be no error, and you should see output similar to the following:

> npm run extract

Catalog statistics:
┌──────────┬─────────────┬─────────┐
│ Language │ Total count │ Missing │
├──────────┼─────────────┼─────────┤
│ cs       │     0       │   0     │
│ en       │     0       │   0     │
│ fr       │     0       │   0     │
└──────────┴─────────────┴─────────┘

(use "lingui extract" to update catalogs with new messages)
(use "lingui compile" to compile catalogs for production)

Read more about Lingui CLI and its commands.

Further Reading​