JavaScript Build fails on chore/typescript-7 (PR #106): TS 7's native compiler breaks Rollup and ESLint typed-linting

[cratis-direct]

Describe the bug

The JavaScript Build workflow fails on PR #106 (chore/typescript-7, #106), most recently in run https://github.com/Cratis/Components/actions/runs/34227857632. main itself is green (typescript stays pinned at ^6.0.3 there) — this is isolated to the TypeScript 7 upgrade attempt.

Steps to reproduce

1. Check out chore/typescript-7 (or bump root package.json's typescript to ^7.0.2).
2. yarn install
3. yarn build (which runs rollup -c ./rollup.config.mjs via @rollup/plugin-typescript)

Expected behavior

The Rollup build (and yarn lint) succeed against TypeScript 7, or CI clearly documents that the toolchain isn't ready yet.

Actual behavior

Rollup crashes:

[!] TypeError: Cannot read properties of undefined (reading 'ES2015')
    at node_modules/@rollup/plugin-typescript/dist/es/index.js:528:16

yarn install also emits, before the crash:

YN0060: typescript is listed by your project with version 7.0.2, which doesn't satisfy what
@typescript-eslint/eslint-plugin and other dependencies request (>=4.9.0 <6.1.0).

Root cause (confirmed independently)

TypeScript 7 ships a native (Go) compiler. Its typescript npm package only exports version / versionMajorMinor — the classic JS compiler API (ModuleKind, ScriptTarget, createProgram, …) is gone. Any tool that drives typescript as a library rather than shelling out to the tsc CLI breaks:

• @rollup/plugin-typescript reads ts.ModuleKind.ES2015, which is now undefined → the crash above. The latest published version, 12.3.0, is already what this repo uses (package.json pins ^12.3.0) — there is no newer release with native-compiler support to upgrade to. Tracked upstream: @rollup/plugin-typescript - Support for TypeScript 7 rollup/plugins#2016 ("Support for TypeScript 7"), still open.
• @typescript-eslint (typescript-estree) similarly depends on the classic API for typed linting, and its own peer dependency still caps typescript at <6.1.0 even in the latest release (8.70.0). Tracked upstream: Enhancement: Use TS 7 (tsgo / typescript-go) for type information typescript-eslint/typescript-eslint#10940 ("Use TS 7 (tsgo / typescript-go) for type information"), still open.

So neither of the two possible fixes is available today:

• Updating @rollup/plugin-typescript to a version that supports TS7 — no such version exists yet.
• Keeping @typescript-eslint happy with TS7 — its peer range still excludes it.

The only way to make this repo's toolchain green with typescript on ^7.0.2 right now would be dropping Rollup-based bundling and ESLint typed-linting, which is out of proportion to a version bump.

Recommendation

Keep typescript pinned to ^6.0.3 (as main already is) and leave PR #106 open-but-parked, or close it, until both rollup/plugins#2016 and typescript-eslint/typescript-eslint#10940 land native-compiler support. Re-attempt the upgrade once those are resolved.

Additional context

• Failing run: https://github.com/Cratis/Components/actions/runs/34227857632 (PR Upgrade TypeScript to 7 (build failing — needs review) #106 merge ref refs/remotes/pull/106/merge)
• main's own most recent JavaScript Build run is green: https://github.com/Cratis/Components/actions/runs/34156670036
• Upstream blockers: @rollup/plugin-typescript - Support for TypeScript 7 rollup/plugins#2016, Enhancement: Use TS 7 (tsgo / typescript-go) for type information typescript-eslint/typescript-eslint#10940

[cratis-direct]

Thanks for opening this - it has been received and will be looked at.

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Posted by Stagehand (AI) - an autonomous agent, not a person. Review accordingly.