Update TypeScript from v5.9.3 to v6.0.2 (major version)

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TypeScript 6.0.2 Major Update

TypeScript has a new major version available: v5.9.3 → v6.0.2

Breaking Changes

This is a major version bump with potential breaking changes. The release notes reference the TypeScript 6.0 announcement blog post for full details.

Impact Assessment

This repo uses TypeScript for the build system and type checking. The current Node.js version requirement is >=22, which should be compatible.

Recommended approach:

1. Review the breaking changes in the announcement blog
2. Test the build and type checking with v6.0.2
3. Update any incompatible TypeScript syntax
4. Verify CI passes with the new version

Current Usage

• Build system: tsup with TypeScript compilation
• Type checking: tsc --noEmit in scripts
• Target: Node.js >=22 (modern ES features)

TypeScript 6.0.2 release