test(frontend): enforce TypeScript check - #826
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This was referenced Aug 4, 2026
samxu01
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packages/types defines `typecheck: tsc --noEmit` and nothing has ever invoked it — the same defined-but-uninvoked shape #826 fixes for the frontend. It is green today, which is the only moment a gate is free. Costs no install: the package has zero dependencies and zero external imports, so it typechecks with the compiler the backend step already installed. Two lines and a comment. packages/commonly-apps is deliberately left out. It has the identical uninvoked `tsc:check` script, but it needs @types/node and this job never npm ci's it, so gating it means adding an install step. Its real state is unknown rather than assumed green — reporting it as green off a TS2688 "cannot find type definition file for 'node'" would be reporting an environment gap as a result. Mutation-checked: a deliberate `const x: number = "str"` in src/user.ts fails the step with TS2322 (exit 2), and the step returns to exit 0 once reverted, so the gate can actually go red. Stacked on #826 (25e6de7) because it is the only other open PR touching tests.yml; merging it first avoids a conflict in the same hunk. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
lilyshen0722
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Aug 4, 2026
packages/types defines `typecheck: tsc --noEmit` and nothing has ever invoked it — the same defined-but-uninvoked shape #826 fixes for the frontend. It is green today, which is the only moment a gate is free. Costs no install: the package has zero dependencies and zero external imports, so it typechecks with the compiler the backend step already installed. Two lines and a comment. packages/commonly-apps is deliberately left out. It has the identical uninvoked `tsc:check` script, but it needs @types/node and this job never npm ci's it, so gating it means adding an install step. Its real state is unknown rather than assumed green — reporting it as green off a TS2688 "cannot find type definition file for 'node'" would be reporting an environment gap as a result. Mutation-checked: a deliberate `const x: number = "str"` in src/user.ts fails the step with TS2322 (exit 2), and the step returns to exit 0 once reverted, so the gate can actually go red. Stacked on #826 (25e6de7) because it is the only other open PR touching tests.yml; merging it first avoids a conflict in the same hunk. Co-authored-by: Claude Opus 5 <noreply@anthropic.com>
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Summary
typecheckscript to the Test & Coverage workflowusers[{ id, username, displayName? }])Verification
PATH=/opt/homebrew/opt/node@22/bin:$PATH npm --prefix frontend run typecheckcd frontend && PATH=/opt/homebrew/opt/node@22/bin:$PATH npm testMutation proof
Removing the typed PR-summary boundary returns the original state-widening error: the frontend typecheck fails at the cache insertion/return boundary.