Inline next-transpile-modules

[jaredpalmer]

Describe the feature you'd like to request

As a monorepo user that leverages yarn, npm, pnpm workspaces, Next.js requires an external plugin that degrades build performance (next-transpile-modules) because of symlink quirks.

Describe the solution you'd like

Inline/enable a similar feature to next-transpile-modules directly into Next.js.

For example, imagine there is a package called @acme/ui in a workspaces monorepo.

// package.json
{
  "name": "my-app",
  "dependencies": {
     "next": "latest",
     "@acme/ui": "*" // or "workspace:*" in pnpm and yarn 2+
   }
}

// next.config.js
module.exports = {
    transpileModules: ['@acme/ui'] 
}

Describe alternatives you've considered

n/a

[remorses]

An alternative would be to always transpile paths that do not contain node_modules

This is always valid in yarn, npm and pnpm workspaces, the local packages real paths (the path linked by symlinks) will always be in a directory out of node_modules

[timneutkens]

@remorses that's already covered by externalDir for TypeScript files: https://github.com/timneutkens/next.js/blob/canary/packages/next/build/webpack-config.ts#L866-L869

I agree that you shouldn't have to configure what packages exist in a workspaces setup, basically expanding externalDir to all code. Even with that change there's still the case of people wanting to downlevel specific packages to run in older browsers.

[matamatanot]

@jaredpalmer
Is this feature already implemented?
https://beta.nextjs.org/docs/api-reference/next.config.js#transpilepackages

The next-transpile-modules is still used in turborepo docs. Is there any plan to change it?
https://turbo.build/repo/docs/handbook/sharing-code/internal-packages#6-configuring-your-app

[matamatanot]

@timneutkens shared the details here. Sorry for that I had missed it.

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