@includeCode does not allow regions in typescript files with .mts file extension

[littlespex]

Search terms

@includecode, mts

Expected Behavior

@includeCode works with all valid Typescript file extensions

Actual Behavior

An error is produced:

[error] @includeCode tag in {FUNCTION} specified "{FILE}.mts#{REGION}", but regions are not supported for this file extension.

Steps to reproduce the bug

1. Create a typescript file with the .mts extension.
2. Add a //#region comment block to the .mts file
3. Reference the region form another file using a {@includeCode} tag

Reproduction PR: TypeStrong/typedoc-repros#52

Environment

• Typedoc version: 0.28.2
• TypeScript version: 5.8.3
• Node.js version: 23.9.0
• OS: macOs 15.3.2

[Gerrit0]

Easy to fix! https://github.com/TypeStrong/typedoc/blob/master/src/lib/converter/plugins/IncludePlugin.ts

[littlespex]

I tried adding regionTagREsByExt["mts"] = regionTagREsByExt["ts"];. It solves the issue, but now I see this warning:

[warning] Unsupported highlight language mts will not be highlighted in comment

[Gerrit0]

Ah, that makes some sense, we'll probably have to add some default aliases in https://github.com/TypeStrong/typedoc/blob/master/src/lib/utils/highlighter.tsx

[littlespex]

Thanks! I'll have a PR shortly