Add Turbopack sourcemap alias

[timneutkens]

What?

We got an issue report on the Next.js repository about the vscode debugger not automatically working with Turbopack enabled: https://github.com/vercel/next.js/issues/63740.

Turbopack (website) is the new bundler we've been building, it supports sourcemaps by default and works really well with VS Code's debugger but requires additional configuration compared to using Next.js with webpack because the debugger has built-in handling of webpack paths like webpack://.

This PR aims to support Turbopack paths in the same way.

On the Turbopack side we have this open PR to add turbopack:// to the sourcemaps: https://github.com/vercel/next.js/pull/64965

How?

Updated the sourceMapPathOverrides default to include the required path mapping for Turbopack. Similar to how Webpack and Meteor are handled there.

Open questions

Since I'm not familiar with this repository I could use some helping getting this over the line if it's not already good to land.

Specifically what's potentially missing is a test and the docs still need to be updated. It seems OPTIONS.md is auto-generated, should I run the script to generate it?

Thanks in advance!

[avianion]

@Tyriar @rzhao271 Please merge this, it's a small change but very useful for Turbopack and nextjs users.

[connor4312]

Please run npm run fmt and then npm run watch to get the file formatted and OPTIONS.md updated. Thanks!

[Tyriar]

@avianion pinging random people isn't necessary

[avianion]

@Tyriar ok bro

[Tyriar]

@avianion thanks bro

[timneutkens]

Thanks @connor4312 💯 Very helpful!

[connor4312]

no problem, this will be out in the VS Code release next week

[timneutkens]

Awesome, thank you!