eslint-import-resolver-typescript

What is eslint-import-resolver-typescript?

The eslint-import-resolver-typescript package is a plugin for ESLint that helps in resolving import paths for TypeScript files. It allows ESLint to understand TypeScript syntax and resolve paths according to the TypeScript compiler options. This is particularly useful when using features like path aliases and custom module directories in TypeScript projects.

What are eslint-import-resolver-typescript's main functionalities?

Resolving TypeScript Path Aliases

This feature allows the resolver to use TypeScript's path aliases defined in tsconfig.json to resolve modules, which helps ESLint to understand custom path mappings.

module.exports = {
  settings: {
    'import/resolver': {
      typescript: {
        // use <root>/tsconfig.json
        project: '.'
      }
    }
  }
};

Support for Multiple tsconfig Files

The resolver can be configured to use multiple tsconfig.json files, which is useful in monorepos or projects with multiple TypeScript configurations.

module.exports = {
  settings: {
    'import/resolver': {
      typescript: {
        // a list of tsconfig.json to use
        project: ['tsconfig.json', 'packages/*/tsconfig.json']
      }
    }
  }
};

Ignoring TypeScript Errors

This feature allows the resolver to ignore TypeScript errors when resolving paths. It is useful when you want ESLint to focus on import/export issues without being blocked by TypeScript compilation errors.

module.exports = {
  settings: {
    'import/resolver': {
      typescript: {
        // ignore TypeScript errors
        alwaysTryTypes: true
      }
    }
  }
};

Other packages similar to eslint-import-resolver-typescript

eslint-import-resolver-node

This package provides a resolver for the ESLint plugin import that resolves node modules and commonjs modules. It does not have TypeScript-specific features but is suitable for projects using plain JavaScript.

eslint-import-resolver-webpack

This resolver is designed for projects using Webpack and allows ESLint to resolve module paths based on the Webpack configuration. It supports features like Webpack aliases and modules, which can be similar to TypeScript path aliases but is tailored for Webpack-specific configurations.

eslint-import-resolver-babel-module

This package integrates with Babel and allows ESLint to resolve modules using Babel's module resolver plugin. It is similar to eslint-import-resolver-typescript in that it helps resolve non-standard module paths, but it is focused on Babel rather than TypeScript.

README

eslint-import-resolver-typescript

This plugin adds TypeScript support to eslint-plugin-import.

This means you can:

• import/require files with extension .ts/.tsx!
• Use paths defined in tsconfig.json.
• Prefer resolve @types/* definitions over plain .js.
• Multiple tsconfigs support just like normal.

TOC

• Notice
• Installation
• Configuration
• Contributing

Notice

After version 2.0.0, .d.ts will take higher priority then normal .js files on resolving node_modules packages in favor of @types/* definitions.

If you're facing some problems on rules import/default or import/named from eslint-plugin-import, do not post any issue here, because they are just working exactly as expected on our sides, take https://github.com/benmosher/eslint-plugin-import/issues/1525 as reference or post a new issue to eslint-plugin-import instead.

Installation

# npm
npm i -D eslint-plugin-import @typescript-eslint/parser eslint-import-resolver-typescript

# yarn
yarn add -D eslint-plugin-import @typescript-eslint/parser eslint-import-resolver-typescript

Configuration

Add the following to your .eslintrc config:

{
  "plugins": ["import"],
  "rules": {
    // turn on errors for missing imports
    "import/no-unresolved": "error"
  },
  "settings": {
    "import/parsers": {
      "@typescript-eslint/parser": [".ts", ".tsx"]
    },
    "import/resolver": {
      // use <root>/tsconfig.json
      "typescript": {
        "alwaysTryTypes": true // always try to resolve types under `<root>@types` directory even it doesn't contain any source code, like `@types/unist`
      },

      // use <root>/path/to/folder/tsconfig.json
      "typescript": {
        "directory": "path/to/folder"
      },

      // Multiple tsconfigs (Useful for monorepos)

      // use a glob pattern
      "typescript": {
        "directory": "packages/*/tsconfig.json"
      },

      // use an array
      "typescript": {
        "directory": [
          "packages/module-a/tsconfig.json",
          "packages/module-b/tsconfig.json"
        ]
      },

      // use an array of glob patterns
      "typescript": {
        "directory": [
          "packages/*/tsconfig.json",
          "other-packages/*/tsconfig.json"
        ]
      }
    }
  }
}

Contributing

• Make sure your change is covered by a test import.
• Make sure that yarn test passes without a failure.
• Make sure that yarn lint passes without conflicts.
• Make sure your code changes match our type-coverage settings: yarn type-coverage.

We have GitHub Actions which will run the above commands on your PRs.

If either fails, we won't be able to merge your PR until it's fixed.

Changelog

2.1.0 (2020-07-30)

Bug Fixes

• options could be null - close #42 (81db8eb)
• typo (#40) (585509e)
• wrong path resolution in multiple eslintrc configurations (#51) (d563eeb), closes #50