RFC: Support webpack-like chunk filename template string in Turbopack mode

[xusd320]

Goals

1.Support the similar features of output.filename and output.chunkFilename

Non-Goals

Only support template placeholder of "[name]" and "[contenthash:{len}]" like "xyn.[name].[contenthash:8].js", not support more templates

Background

1. See webpack config in next.js

   next.js/packages/next/src/build/webpack-config.ts

   Line 1279 in 8268575

   filename: isNodeOrEdgeCompilation

   &&

   next.js/packages/next/src/build/webpack-config.ts

   Line 1292 in 8268575

   chunkFilename: isNodeOrEdgeCompilation

   
   the output chunk paths is configured by filename template
2. Third-part users of Turbopack need these features too.

Proposal

We implemented these features in an forked repo of next.js , maybe not good enough for now.
v15.3.2...umijs:next.js:utoo-patch-v15.3.2#diff-408605a801220372d0b8bfe1bd753f261fde3a72e9a082b990531fcdb76b6585R426
But we hope it's been supported by Turbopack upstream. If this is acceptable, I can help to port it into upstream.

[baljir0901]

Really appreciate you bringing this up — this feature would be incredibly helpful!

Being able to define chunk filenames using a simple template like xyn.[name].[contenthash:8].js gives much more control over cache strategy, file predictability, and CDN integration. These patterns are especially useful for enterprise systems, micro-frontends, and custom deployment pipelines.

Limiting the supported placeholders to [name] and [contenthash:len] is a smart scope — it avoids unnecessary complexity while still solving real-world needs.

Also great to hear that you've already implemented this in a fork — that’s a strong signal of practical demand. Would love to see this upstreamed if maintainers are open to it.

Thanks again for opening the discussion and offering to help — hope this moves forward! 🚀

[xusd320]

The implementation in our fork is little hack, need a better implementation in upstream. We hope to get some ideas from next.js.

[xusd320]

Something more, contenthash for chunk path is already supported by Turbopack, filename template is not.