Typescript

Lingui supports typescript types out of the box since version 3.0.0. Feel free to submit any query you find related to typescript on Github Issues

Webpack setup

The ability of lingui to support the intuitive syntax comes from the @lingui/babel-preset-react Babel transformation. The preset consist of 2 plugins, namely @lingui/babel-plugin-transform-js and @lingui/babel-plugin-transform-react. The plugins perform transformation only on the JSX and tagged template literals. Thus, the JSX and tagged template literals must not be transpiled before the 2 plugins get to do their magic to process the intuitive syntax.

In order to preserve JSX and tagged template literals for the lingui plugins, you must set the following in your tsconfig.json.

{
  "compilerOptions": {
    "jsx": "preserve",
    "target": "es2016"
  }
}

For lingui 2.0+, install babel-loader, babel-preset-react, babel-preset-env, @lingui/babel-preset-react. Use the presets by changing your .babelrc to the following. The order of the preset is important.

{
  "presets": [
    "babel-preset-env",
    "babel-preset-react",
    "@lingui/babel-preset-react"
  ]
}

In your webpack.config.js, use both babel-loader and ts-loader for Typescript files.

{
  module: {
    rules: [
      {
        test: /\.tsx?$/,
        exclude: /node_modules/,
        use: ['babel-loader', 'ts-loader']
      }
    ]
  }
}

Note

If you are not using .babelrc file, keep in mind that by running lingui extract, the Webpack config is not used. To supply babel options for the extraction process use extractBabelOptions configuration option.

compileNamespace must be set to ts (ES6 default export) in the Lingui config otherwise compiled catalogs can’t be imported using ES import, but rather CommonJS require:

{
  "compileNamespace": "ts"
}

Macros types in non-React environments

Since the opening of this issue we investigated that macros can be used on Typescript environments where React isn’t required.

Now we’re shipping two declaration types:

• index.d.ts files with @lingui/core, @lingui/react and react as peerDependencies.

• global.d.ts files with just @lingui/core as peerDependencies.

Now you can modify your tsconfig.json in your root directory and reference the global file:

{
  "compilerOptions": {
    "types": [
      "./node_modules/@lingui/macro/global",
    ]
  }
}

Type definitions

Since version 3.0.0 types are already inside @lingui modules, so you don’t need to install any external dependency related to types.

For earlier versions:

Jeow Li Huan wrote type definition for @lingui/core and @lingui/react:

The type definitions requires Typescript 2.8 or later.

npm install --save-dev @types/lingui__core  # types for @lingui/core
npm install --save-dev @types/lingui__react  # types for @lingui/react
npm install --save-dev @types/lingui__macro  # types for @lingui/macro

Please report any issues in maintainers repo.