Typescript pnpm monorepo, Path Aliases Conflicts Between Local Dependencies During Build

Path alias conflicts in a PNPM monorepo built using Next.js are successfully resolved by this method. The steps are broken down as follows:

1. To transpile shared packages, use next-transpile-modules.

Install the package:

pnpm add next-transpile-modules

Update the next.config.js in your Next.js app to include the shared packages for transpilation:

const withTM = require('next-transpile-modules')(['@yourcompany/shared-package']);
module.exports = withTM({
  // Your existing Next.js configuration
});

This guarantees that the Next.js build process appropriately transpiled the shared code.

2. Specify Distinct Package Names

Every package within your monorepo needs to have a distinct name specified within it.

{
  "name": "@yourcompany/shared-package",
  "version": "1.0.0"
}

This name scheme facilitates simpler path management and helps prevent conflicts.

3. Configure TypeScript path aliases

Define the alias in the root of tsconfig.json and bind it across packages.json:

For the shared package (@yourcompany/shared-package), add a relative path in the consuming app’s tsconfig.json:

{
  "compilerOptions": {
    "baseUrl": ".",
    "paths": {
      "@yourcompany/shared-package/*": ["../../packages/shared-package/src/*"]
    }
  }
}

4. Ensure Correct Path Resolution During Compilation

• Use relative paths in tsconfig.json for kind inference and route resolution throughout both development and build time.
• This lets in TypeScript to resolve imports as it should be without issues during builds.

Via combining next-transpile-modules with particular bundle names and proper TypeScript direction aliases:

• The shared code is transpiled correctly within the Next.js app build process.
• TypeScript resolves paths accurately, ensuring proper type checking and inference.
• Monorepo maintenance is simplified with clear package naming and consistent aliasing.

This method is powerful and aligns well with quality practices for dealing with shared code in a monorepo using next.js.