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Why this gate exists

Most avoidable CI failures come from cheap checks skipped before pushing: Biome formatting, flutter analyze infos (fatal in CI), TypeScript errors such as TS6059 (a package importing app source outside its rootDir), stale generated inventories and branch names the checker rejects. bun check is too heavy for agent machines because its Turbo graph can build workspace dependencies, so it is not run locally. bun check:changed is the replacement before every push.
It never runs builds, bun check or Turbo. Small repository scripts run directly; Vitest, type-check and flutter analyze are queued through ttr resources run when resource control is installed and enabled (--no-ttr opts out). Without ttr, steps run sequentially with Vitest capped at two workers.

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What runs for which paths

Oxlint stays advisory until a scope records Biome parity under the Oxc adoption rules; Biome remains the blocking formatter and linter. Paused runtimes are excluded.

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Type-checking without built declarations

CI builds @tuturuuu/types, supabase, internal-api and masonry before type-checking. Local checkouts usually lack those dist declarations, which produces thousands of missing-module errors and implicit-any cascades. The gate runs -p <project> --noEmit --incremental false --composite false per project and classifies diagnostics:
  • With every workspace declaration present, all diagnostics block.
  • When declarations are cold, missing-module errors citing an unbuilt workspace package are ignored. Configuration errors (TS5xxx/TS6xxx, including TS6059) and errors in changed files that do not import an unbuilt package block. A changed file importing a missing package still blocks on real type errors such as TS2322; only implicit-any follow-ons (7005/7006/7031/7034) in that file are advisory. Diagnostics in unchanged files remain advisory.
Shared-package changes also select transitive reverse dependents from workspace manifests. Root/shared configuration changes (package.json, bun.lock, root tsconfig.json, biome.json, turbo.json, bunfig.toml, .npmrc, root vitest.config.ts, .oxlintrc.json, .oxfmtrc.json, and packages/typescript-config) print not covered; CI only because this focused gate cannot prove their full repository effect. CI type-checking remains authoritative.

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Optional tsrs shadow

--checker auto and --checker tsc use tsc only. Existing clean-source qualification does not establish that tsrs catches seeded errors, so a tsrs pass cannot replace tsc. --checker tsrs requests advisory comparisons, always followed by tsc regardless of success, failure or crash. Only tsc can block. The resolver runs only if at least one planned project is in the recorded qualification set; unqualified-only plans fall back to tsc. Hook mode uses only an existing TSRS_BIN, with no network fetch. Outside hooks, pinned npm resolution disables install lifecycle scripts. See the qualification limits.

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Optional pre-push hook

bun install already points core.hooksPath at .githooks. The pre-push hook is inert until you opt in:
The hook refuses tracked staged or unstaged edits so it can check the exact pushed HEAD. It also refuses untracked files in changed workspaces and selected reverse dependents because those files can affect type-checking and test discovery. When script tests are selected, the fence covers scripts/, plugins/ and .github/actions/ as well as the tests’ own parent directories, so nested tests cannot depend on untracked helpers in a parent or sibling directory. Ignored files are excluded from this check. NUL-delimited Git paths preserve whitespace; only option-like repository/workspace-relative prefixes are rejected before file tools run. Internal dash directories, including Git app routes, are valid. The hook checks committed changes only and skips deletions or pushes of refs other than HEAD. Agents should run bun check:changed explicitly before pushing whether or not the hook is enabled.

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Bun upgrade and lock normalization

Until the Bun 1.4.4 upgrade in #6427 lands, a normal bun install with installed Bun 1.4.4 can normalize the 1.4.3-era bun.lock. The resulting tracked change makes the opted-in hook refuse a push. Prefer bun install --frozen-lockfile for the existing lock or the repository-pinned Bun version; do not commit incidental normalization into an unrelated PR. If drift already exists, preserve its provenance and use a clean isolated checkout. #6427 owns the normalized lock; a passing frozen install alone does not prove a normal install leaves it stable.

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Regression coverage

scripts/check-changed.test.js, scripts/check-changed/plan.test.js, scripts/check-changed/type-check.test.js, scripts/check-changed/tsrs.test.js and scripts/ts-diagnostics.test.js cover path mapping, the branch pattern’s parity with the workflow, hook opt-in, ttr queueing, cold-declaration classification and tsc confirmation of tsrs failures.