Add JSDoc type-checking and test coverage gating#8
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- Add tsconfig.json + types/globals.d.ts and // @ts-check headers; tsc --checkJs runs clean in strict mode (JSDoc param/cast annotations added where the DOM types needed narrowing). - Add Vitest coverage (Istanbul provider, pool-agnostic) scoped to the pure logic modules, with thresholds (90% statements/lines, 95% functions, 85% branches — branches lower because each UMD wrapper has a browser-only branch unreachable under Node). - Wire `npm run typecheck` and `npm run coverage` into CI; ignore coverage/. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Raises the static-analysis and testing bar:
tsconfig.json+types/globals.d.ts+// @ts-checkheaders.tsc --checkJsruns strict and clean — JSDoc annotations/casts added where DOM types needed narrowing. Newnpm run typecheck.npm run coverage.typecheckandcoverage;coverage/is gitignored.No runtime/behavior changes to the extension — types and JSDoc only.
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