refactor: enforce the type-suppression ban with typechecked tests - #2909
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…or and real types
Review of this branch found two documented gates with no mechanism behind them, both of which passed CI while being violated: - `@ts-nocheck` was banned in AGENTS.md but caught by nothing. Biome's `noTsIgnore` matches `@ts-ignore` only, so a file could disable type checking wholesale and stay green in lint and typecheck alike. - The shared `tests/` helpers were not linted at all. Root `lint` is `bun run --filter '*' lint`, and `tests/` sits outside `workspaces`, so the `noExplicitAny: error` rule this branch turned on never reached the fixtures the branch had just cleaned. Add `scripts/ci-guard-type-suppressions.sh` as the mechanism, following the existing `ci-guard-removed-compressors.sh` pattern: it bans `@ts-nocheck`/`@ts-ignore` repo-wide, bans `@ts-expect-error` under any `src/`, and rejects directives carrying no reason — which also makes the "must name the condition" rule enforced rather than review-only. Wired into the Linux/Node 22 CI leg. Extend root `lint` with `lint:root` so `tests/` and `scripts/` are covered by Biome. Also: - Document why the gcc `/// <reference>` is load-bearing. Removing it keeps the package's own typecheck green (its tsconfig globs `src/**/*`) but breaks `@node-minify/core`, which imports the source file directly from `core.test.ts`. - Move `core.test.ts` directives off the assertion line and onto the line the compiler actually reports, so each suppresses only its own error. - Replace `Partial<Settings>` + `as Settings` with `Settings` plus a commented directive, matching the convention used elsewhere. - Correct the AGENTS.md `any` wording: the gate fires on every explicit `any`, not just `as any`, and now documents where enforcement lives. - Track the type-hardening plan doc; its siblings are already tracked and it is the provenance for these conventions.
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Included review availability: Your plan provides up to 4 included reviews per hour; 2 remain after this review. 📝 WalkthroughWalkthroughThe change enables repository-wide TypeScript suppression checks, includes package tests in TypeScript compilation, adds typecheck support for ChangesTypeScript type hardening
Estimated code review effort: 3 (Moderate) | ~25 minutes Merge Risk: ⚪ Minimal · up to The types package now runs its own stricter typecheck with Node types scoped explicitly. No current merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 3 functions across 32 files. (2 skipped: 2 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Inline comments:
In `@AGENTS.md`:
- Line 160: The documentation must match the new lint command behavior: in
AGENTS.md lines 160-160, remove the claim that root lint excludes tests/ and
scripts/; in scripts/ci-guard-type-suppressions.sh lines 7-10, document only the
remaining guard-specific type-suppression checks and keep both descriptions
consistent.
In `@package.json`:
- Line 47: Align all enforcement commands to the complete repository scope:
update package.json:47-47 entry lint:root to include examples/ and docs/src/,
update
docs/plans/2026-09-02-1642-refactor-typescript-type-hardening-plan.md:204-204
cast verification to use the same scope, and update
scripts/ci-guard-type-suppressions.sh:37-37 to scan tracked source files or the
repository root.
In `@scripts/ci-guard-type-suppressions.sh`:
- Line 50: Update the suppression scan pipeline in
scripts/ci-guard-type-suppressions.sh to extract and test only each matched
filename against the src/ path pattern, rather than testing the complete grep
output line. Preserve the existing behavior for identifying production-source
matches and allowing no matches.
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.github/workflows/test.ymlAGENTS.mdbiome.jsondocs/plans/2026-09-02-1642-refactor-typescript-type-hardening-plan.mdpackage.jsonpackages/action/__tests__/benchmark.test.tspackages/action/__tests__/comment.test.tspackages/action/__tests__/compare.test.tspackages/action/__tests__/index.test.tspackages/action/__tests__/minify.test.tspackages/action/__tests__/runAutoMode.test.tspackages/action/__tests__/runExplicitMode.test.tspackages/action/tsconfig.jsonpackages/benchmark/__tests__/coverage.test.tspackages/benchmark/tsconfig.jsonpackages/clean-css/__tests__/clean-css-error.test.tspackages/clean-css/tsconfig.jsonpackages/cli/__tests__/cli.test.tspackages/cli/__tests__/spinner.test.tspackages/cli/tsconfig.jsonpackages/core/__tests__/compress-paths.test.tspackages/core/__tests__/compress_async.test.tspackages/core/__tests__/core.test.tspackages/core/__tests__/setup.test.tspackages/core/tsconfig.jsonpackages/cssnano/__tests__/cssnano-error.test.tspackages/cssnano/tsconfig.jsonpackages/csso/__tests__/csso-error.test.tspackages/csso/tsconfig.jsonpackages/esbuild/tsconfig.jsonpackages/google-closure-compiler/__tests__/runner-edge-cases.test.tspackages/google-closure-compiler/src/index.tspackages/google-closure-compiler/tsconfig.jsonpackages/html-minifier/__tests__/html-minifier-error.test.tspackages/html-minifier/tsconfig.jsonpackages/imagemin/__tests__/imagemin.test.tspackages/imagemin/tsconfig.jsonpackages/jsonminify/__tests__/jsonminify-error.test.tspackages/jsonminify/tsconfig.jsonpackages/lightningcss/tsconfig.jsonpackages/minify-html/__tests__/minify-html-error.test.tspackages/minify-html/tsconfig.jsonpackages/no-compress/__tests__/no-compress.test.tspackages/no-compress/tsconfig.jsonpackages/oxc/__tests__/oxc-error.test.tspackages/oxc/tsconfig.jsonpackages/sharp/__tests__/sharp.test.tspackages/sharp/tsconfig.jsonpackages/svgo/tsconfig.jsonpackages/swc/tsconfig.jsonpackages/terser/__tests__/terser-error.test.tspackages/terser/tsconfig.jsonpackages/types/package.jsonpackages/types/tsconfig.jsonpackages/uglify-js/tsconfig.jsonpackages/utils/__tests__/getContentFromFilesAsync.test.tspackages/utils/__tests__/setPublicFolder.test.tspackages/utils/__tests__/utils.test.tspackages/utils/tsconfig.jsonscripts/ci-guard-type-suppressions.shtests/fixtures.tstests/tsconfig.json
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- tests/tsconfig.json
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- Guard scans the repository root instead of a maintained directory list, so root-level files and future source dirs cannot bypass it - src/ filter applies to the filename field only (awk), so a test line containing /src/ in its text no longer false-positives - lint:root covers examples/ (workspace without a lint script, silently skipped by --filter '*') - AGENTS.md and guard header no longer claim root lint misses tests/ and scripts/
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Codecov Report✅ All modified and coverable lines are covered by tests. Additional details and impacted files@@ Coverage Diff @@
## develop #2909 +/- ##
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Coverage 99.64% 99.64%
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Files 69 69
Lines 1961 1961
Branches 599 599
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Hits 1954 1954
Misses 7 7 ☔ View full report in Codecov by Harness. 🚀 New features to boost your workflow:
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Summary
The
as anyban is now enforced by tooling instead of convention: test files are typechecked, every type suppression must be a live, commented@ts-expect-error, and CI fails on any regression. Before this, test files were invisible totsc(every package's tsconfig included onlysrc/), which let ~190 unchecked casts accumulate silently — casts that could rot into tests passing valid input and verifying nothing.What changed
__tests__/(therootDiroverride had to go — it rejects out-of-tree files with TS6059 regardless ofnoEmit).packages/typesgains its own typecheck withskipLibCheck: false, since its only file is a.d.tsthatskipLibCheck: truesilently skipped. The orphanedtests/tsconfig.jsonis deleted.as any, ~40as unknown as T, and 8 bare@ts-expect-erroracross 29 test files are now commented@ts-expect-errordirectives (compiler-verified: a stale one fails the build as TS2578) or real types where one exists — octokit mocks get typed per-file helpers, shared fixtures useCompressorfrom@node-minify/types.noExplicitAnyandnoTsIgnoreset toerror(both default to warn, which exits 0). A newscripts/ci-guard-type-suppressions.shcovers what Biome cannot:@ts-nocheck/@ts-ignoreanywhere,@ts-expect-errorinsrc/, and bare directives without a reason. Root lint now also coverstests/andscripts/, which sit outside the workspace filter.Design decisions
@ts-expect-errorover cast helpers — the directive fails the build if the error it suppresses ever stops existing, so it cannot rot; a cast helper is still unchecked.tsc --noEmitscript with zero CI wiring.google-closure-compiler/src/index.tsneeded a triple-slash reference to its ambient types — they were invisible to other packages' programs that import its source directly (core's tests do). Type-only; emitted output unchanged.Validation
bun run ciexit 0: build, check-exports, lint (including the new root leg), typecheck (23 packages), coverage.@ts-nocheckin tests,@ts-expect-errorin src, bare directive,as any, and a raw type error in a test file each fail their gate; clean tree passes.as any/as unknown as/@ts-ignore/@ts-nocheck: zero matches.Suggest squash-merge: the branch is intentionally red on typecheck between the coverage-widening commit and the last cast-conversion commit (directives can only be verified in checked files), so landing it as one commit keeps
developbisect-safe.Summary by cubic
Test files are now typechecked, so the
as anyban is enforced by tooling instead of convention. Previously tsconfigs only includedsrc/, letting ~170 unchecked casts in tests rot silently; now every suppression must be a live, commented@ts-expect-errorand CI fails on any regression.Refactors
__tests__/;packages/typesgains its own typecheck withskipLibCheck: falserestricted to node types.as any, 29as unknown as T, and 5 bare@ts-expect-errorbecame commented directives or real types, with octokit mocks getting typed per-file helpers.noExplicitAnyandnoTsIgnoreare now errors;scripts/ci-guard-type-suppressions.shscans the repo root to ban@ts-nocheck,src/directives, and reason-less ones, and root lint now also coverstests/,scripts/, andexamples/.@ts-expect-erroris used over cast helpers because a stale directive fails the build while a cast helper stays unchecked.google-closure-compiler/src/index.tsadds a triple-slash reference to its ambient types; emitted output is unchanged.Migration
developbisect-safe.Written for commit ca391b9. Summary will update on new commits.
Summary by CodeRabbit
Quality Improvements
Documentation
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