TSConfig Paths Webpack Plugin

Use paths in tsconfig.json at each directory to let Webpack resolve files as expected. It's like a plugin for aliases, but it's more powerful in the monorepo scenario.

Quick Start

Install the plugin using the package manager.

npm i -D multi-tsconfig-paths-webpack-plugin
yarn add -D multi-tsconfig-paths-webpack-plugin
pnpm i -D multi-tsconfig-paths-webpack-plugin

Add the plugin to your Webpack configuration.

const { MultiTsconfigPathsWebpackPlugin } = require('multi-tsconfig-paths-webpack-plugin');

module.exports = {
  resolve: {
    plugins: [
      new MultiTsconfigPathsWebpackPlugin({
        glob: '../../**/tsconfig.json', // depends on your project structure
      }),
    ],
  },
};

Why Use This Plugin?

In the monorepo scenario, you may have multiple tsconfig.json files in different directories. Each tsconfig.json file may have its own paths configuration. This plugin will help you resolve the files as expected.

For example, here is the project structure:

project
├── packages
│   ├── sub
│   │   ├── src
│   │   │   ├── bar.ts
│   │   │   └── index.ts
│   │   └── tsconfig.json
│   └── main
│       ├── src
│       │   ├── foo.ts
│       │   └── index.ts
│       ├── webpack.config.js
│       └── tsconfig.json
└── tsconfig.json

All tsconfig.jsons have the same baseUrl and paths configuration:

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "@/*": ["src/*"]
    }
  }
}

TypeScript respects the tsconfig.json in all directories. It will resolve the files as expected:

• In the file /packages/main/src/index.ts, if you write import ... from '@/foo', TypeScript resolves the file to /packages/main/src/foo.ts.
• In the file /packages/sub/src/index.ts, if you write import ... from '@/bar', TypeScript resolves the file to /packages/sub/src/bar.ts.

But Webpack aliases are globally set. If you set @ to /packages/main/src, it will resolve all @s to /packages/main/src. The @/bar will be resolved to /packages/main/src/bar.ts, not /packages/sub/src/bar.ts. That means even if you can Ctrl/Cmd + Click to jump to the file in your IDE, there are still errors in Webpack.

This plugin will help you resolve the files as expected. If you don't use monorepo, you can still use this plugin as a replacement for setting config.resolve.alias in Webpack config using tsconfig.json manually.

Don't worry, if your import path is not in the paths configuration, it will not be resolved by this plugin.

Development

pnpm i
pnpm start # go to http://localhost:3000 and see the console

License

MIT