Update dependency typescript to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
typescript (source)	5.9.3 → 7.0.2

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Release Notes

microsoft/TypeScript (typescript)

v7.0.2

Compare Source

v6.0.3: TypeScript 6.0.3

Compare Source

For release notes, check out the release announcement blog post.

• fixed issues query for TypeScript 6.0.0 (Beta).
• fixed issues query for TypeScript 6.0.1 (RC).
• fixed issues query for TypeScript 6.0.2 (Stable).
• fixed issues query for TypeScript 6.0.3 (Stable).

Downloads are available on:

• npm

v6.0.2: TypeScript 6.0

Compare Source

For release notes, check out the release announcement blog post.

• fixed issues query for TypeScript 6.0.0 (Beta).
• fixed issues query for TypeScript 6.0.1 (RC).
• fixed issues query for TypeScript 6.0.2 (Stable).

Downloads are available on:

• npm

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[spaceninja]

Closing: TypeScript 7 is blocked by typescript-eslint. TypeScript 6 works today, and that is the upgrade worth chasing instead.

Why CI is red — two separate failures

build and test: rollup-plugin-dts needs the TypeScript compiler API, which TS 7 (the Go rewrite) does not ship. This one is fixable — adding @typescript/typescript6 resolves it, and dist/ comes out byte-identical.

lint: @typescript-eslint/typescript-estree crashes on ts.ModuleKind.Cjs being undefined. This one is not fixable. The latest typescript-eslint (8.68.0) still declares typescript: ">=4.8.4 <6.1.0", so TS 7 is explicitly out of range — and eslint.config.mjs sets projectService: true, so type-aware linting is load-bearing for us.

TypeScript 6.0.3 passes everything

build, lint, test, and build-storybook all pass on 6.0.3, with dist/ byte-identical to what 5.9.3 produces.

One catch: with the currently-resolved typescript-eslint 8.55.0, TS 6 produces 38 spurious @typescript-eslint/no-unnecessary-condition errors — it reports Number(textarea.getAttribute('rows')) || 2 as "always falsy", because 8.55.0 misreads TS 6's internal type flags. Upgrading typescript-eslint to 8.68.0 clears all 38.

That upgrade is gated on our own config: @cloudfour/eslint-config@25.0.1 pins typescript-eslint at exactly 8.55.0, and 25.0.1 is the latest release. So the sequence is:

1. Release @cloudfour/eslint-config with typescript-eslint >= 8.68.0
2. Bump typescript to 6.0.3 here

Note that closing this PR will not produce a TypeScript 6 PR on its own, since Renovate only offers the newest major. To be offered 6.x in the meantime we would need a .renovaterc.json rule constraining typescript to <7.

[renovate]

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