Getting Started with Intlayer and React Create App

Setting up Intlayer in a Create React App application is straightforward:

Step 1: Install Dependencies

Install the necessary packages using npm:

npm install intlayer react-intlayer

yarn add intlayer react-intlayer

pnpm add intlayer react-intlayer

Step 2: Configuration of your project

Create a config file to configure the languages of your application:

// intlayer.config.ts

import { Locales, type IntlayerConfig } from "intlayer";

const config: IntlayerConfig = {
  internationalization: {
    locales: [
      Locales.ENGLISH,
      Locales.FRENCH,
      Locales.SPANISH,
      // Your other locales
    ],
    defaultLocale: Locales.ENGLISH,
  },
};

export default config;

To see all available parameters, refer to the configuration documentation here.

Step 3: Integrate Intlayer in Your CRA Configuration

Change your scripts to use react-intlayer

  "scripts": {
    "build": "react-intlayer build",
    "start": "react-intlayer start",
    "transpile": "intlayer build"
  },

Note: react-intlayer scripts are based on craco. You can also implement your own setup based on the intlayer craco plugin. See example here.

Step 4: Declare Your Content

Create and manage your content dictionaries:

// src/app.content.tsx
import { t, type DeclarationContent } from "intlayer";
import { type ReactNode } from "react";

const appContent = {
  key: "app",
  content: {
    getStarted: t<ReactNode>({
      en: (
        <>
          Edit <code>src/App.tsx</code> and save to reload
        </>
      ),
      fr: (
        <>
          Éditez <code>src/App.tsx</code> et enregistrez pour recharger
        </>
      ),
      es: (
        <>
          Edita <code>src/App.tsx</code> y guarda para recargar
        </>
      ),
    }),
    reactLink: {
      href: "https://reactjs.org",
      content: t({
        en: "Learn React",
        fr: "Apprendre React",
        es: "Aprender React",
      }),
    },
  },
} satisfies DeclarationContent;

export default appContent;

See how to declare your Intlayer declaration files.

Step 5: Utilize Intlayer in Your Code

Access your content dictionaries throughout your application:

import logo from "./logo.svg";
import "./App.css";
import { IntlayerProvider, useIntlayer } from "react-intlayer";
import { LocaleSwitcher } from "./components/LangSwitcherDropDown";

function AppContent() {
  const content = useIntlayer("app");

  return (
    <header className="App-header">
      <img src={logo} className="App-logo" alt="logo" />

      {content.getStarted}
      <a
        className="App-link"
        href={content.reactLink.href.value}
        target="_blank"
        rel="noopener noreferrer"
      >
        {content.reactLink.content}
      </a>
    </header>
  );
}

function App() {
  return (
    <IntlayerProvider>
      <div className="App">
        {/* To use the useIntlayer hook properly, you should access your data in a children component */}
        <AppContent />
      </div>
      <div className="absolute bottom-5 right-5 z-50">
        <LocaleSwitcher />
      </div>
    </IntlayerProvider>
  );
}

export default App;

Note: If you want to use your content in a string attribute, such as alt, title, href, aria-label, etc., you must call the value of the function, like:
<img src={content.image.src.value} alt={content.image.value} />

(Optional) Step 6: Change the language of your content

To change the language of your content, you can use the setLocale function provided by the useLocale hook. This function allows you to set the locale of the application and update the content accordingly.

import { Locales } from "intlayer";
import { useLocale } from "react-intlayer";

const MyComponent = () => {
  const { setLocale } = useLocale();

  return (
    <button onClick={() => setLocale(Locales.English)}>
      Change Language to English
    </button>
  );
};

Configure TypeScript

Intlayer use module augmentation to get benefits of TypeScript and make your codebase stronger.

alt text

Ensure your TypeScript configuration includes the autogenerated types.

// tsconfig.json

{
  // your custom config
  include: [
    "src",
    "types", // <- Include the auto generated types
  ],
}

Git Configuration

It is recommended to ignore the files generated by Intlayer. This allows you to avoid committing them to your Git repository.

To do this, you can add the following instructions to your .gitignore file:

# Ignore the files generated by Intlayer
.intlayer