Crash on new typescript file pattern `.d.mts` `.d.cts`

[loynoir]

• Rollup Plugin Name: @rollup/plugin-typescript
• Rollup Plugin Version: ^8.3.0
• Rollup Version: ^2.59.0
• Operating System (or Browser):
• Node Version:
• Link to reproduction (⚠️ read below): https://github.com/loynoir/reproduce-rollup-plugins-1032.mjs

Expected Behavior

No error

Actual Behavior

$ rollup -c
./index.mjs → stdout...                                                                                          
[!] Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)                 
lib/a.d.mts (1:7)
1: export declare const value = "a";
          ^
Error: Unexpected token (Note that you need plugins to import files that are not JavaScript)

Additional Information

Typescript have new file pattern .d.mts .d.cts

[shellscape]

Do you have a link for a spec defining these file extensions?

[loynoir]

I think main pull is
microsoft/TypeScript#45884

And entry file index.mjs reference to lib/a.mjs lib/a.d.mts, are generated by official tsc command.

[shellscape]

Thanks, but that PR has 569 files that we're definitely not going to sift through. To consider this a bug, we'll need a link to spec or docs showing that TS officially supports these lnew extensions.

[Septh]

The new extensions were announced with the 4.5 beta : https://devblogs.microsoft.com/typescript/announcing-typescript-4-5-beta/#new-file-extensions

Not sure what the status is right now since many module-related things have been officially delayed and are only available as an experimental flag in nightly releases. : https://www.typescriptlang.org/docs/handbook/release-notes/typescript-4-5.html#whats-new-since-the-beta-and-rc

[stale]

Hey folks. This issue hasn't received any traction for 60 days, so we're going to close this for housekeeping. If this is still an ongoing issue, please do consider contributing a Pull Request to resolve it. Further discussion is always welcome even with the issue closed. If anything actionable is posted in the comments, we'll consider reopening it. ⓘ