If you are using Eslint to lint your TypeScript code, you might have come across the need to provide the parserOptions.project configuration option. This option is used to specify the path to your TypeScript configuration file (tsconfig.json) so that Eslint can understand your project’s TypeScript settings and perform accurate linting. In this blog post, we will explore different solutions to provide the parserOptions.project for Eslint.

Solution 1: Specify the path directly in Eslint configuration

The simplest way to provide the parserOptions.project for Eslint is to directly specify the path to your tsconfig.json file in your Eslint configuration file (.eslintrc.js or .eslintrc.json).

module.exports = {
  // Other Eslint configuration options...
  parserOptions: {
    project: './tsconfig.json',
  },
};

This solution works well if your tsconfig.json file is located in the same directory as your Eslint configuration file.

Solution 2: Use the @typescript-eslint/parser plugin

If you are using the popular @typescript-eslint/parser plugin for Eslint, you can provide the parserOptions.project directly in the plugin configuration.

module.exports = {
  // Other Eslint configuration options...
  parser: '@typescript-eslint/parser',
  parserOptions: {
    project: './tsconfig.json',
  },
  plugins: ['@typescript-eslint'],
  extends: [
    'plugin:@typescript-eslint/recommended',
    // Other Eslint extends...
  ],
};

This solution is especially useful if you are already using the @typescript-eslint/parser plugin for TypeScript-specific linting rules.

Solution 3: Use the eslint-plugin-import plugin

If you are using the eslint-plugin-import plugin, you can also provide the parserOptions.project in its configuration.

module.exports = {
  // Other Eslint configuration options...
  parserOptions: {
    project: './tsconfig.json',
  },
  plugins: ['import'],
  extends: [
    'plugin:import/typescript',
    // Other Eslint extends...
  ],
};

This solution is useful if you want to leverage the features provided by the eslint-plugin-import plugin for TypeScript imports.

Conclusion

Providing the parserOptions.project for Eslint is essential to ensure accurate linting of your TypeScript code. In this blog post, we explored three different solutions to achieve this. You can either specify the path directly in your Eslint configuration, use the @typescript-eslint/parser plugin, or use the eslint-plugin-import plugin. Choose the solution that best fits your project’s needs and enjoy linting your TypeScript code with confidence!