feat(tsconfig): test-d.json, the preset for a type-level test project - #12
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A type-level test asserts with bindings nothing reads, so `noUnusedLocals` and `noUnusedParameters` have to be off for that project and on everywhere else. Every workspace wrote both flags out by hand, usually without the reason. It carries no `include`, and cannot: TypeScript resolves a base config's globs relative to the BASE file's directory, so a shipped one would point inside node_modules — measured, TS18003. `validate.mjs` refuses a `test-d.json` that grows one, so the limit is held rather than remembered. Claude-Session: https://claude.ai/code/session_01GGixjxi5AQ2cNK62bBymfF
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Included review availability: Your plan provides up to 8 included reviews per hour; 6 remain after this review. 📝 WalkthroughWalkthroughThe package adds a ChangesTypeScript test preset
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: ⚪ Minimal · up to This adds a narrowly scoped TypeScript type-test preset and validation contract; no concrete merge-blocking risk is currently identified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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🟡 Changes recommended
A small docs/contract mismatch and a gap in the “mechanically enforced minimalism” validation should be corrected to keep the new preset’s behavior and guarantees aligned.
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Pull request overview
This PR adds a published @btravstack/tsconfig/test-d.json preset intended for type-level test projects, where unused bindings are expected and should not fail the build.
Changes:
- Add
packages/tsconfig/test-d.jsonthat disablesnoUnusedLocalsandnoUnusedParameters. - Update packaging (
files+exports) and CI smoke validation to ensure the preset is shipped and structurally constrained. - Document the new preset usage and publish it via a changeset.
File summaries
| File | Description |
|---|---|
| scripts/validate.mjs | Adds shipping + structural validation for the new test-d.json preset. |
| packages/tsconfig/test-d.json | Introduces the new tsconfig preset disabling unused checks for type-level tests. |
| packages/tsconfig/README.md | Documents the purpose and correct consumption pattern for test-d.json. |
| packages/tsconfig/package.json | Publishes test-d.json via files and exports. |
| .changeset/tsconfig-test-d.md | Declares a minor release for @btravstack/tsconfig describing the new preset. |
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Inline comments:
In `@scripts/validate.mjs`:
- Around line 72-73: Update the testD validation around the existing
forbidden-key loop to enforce an allowlist: accept only the documented root keys
and the two expected compilerOptions flags, rejecting any other root or
compilerOptions entries. Preserve validation of the preset’s required
unused-check settings and use the existing testD structure and error-reporting
conventions.
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.changeset/tsconfig-test-d.mdpackages/tsconfig/README.mdpackages/tsconfig/package.jsonpackages/tsconfig/test-d.jsonscripts/validate.mjs
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A deny-list of four keys lets the fifth through, and this preset is layered LAST in a consumer's `extends` array — anything it grows silently overrides the workspace's own config. `validate.mjs` now names what may appear: `$schema` plus exactly the two unused checks. Also: the README said "those two flags and nothing else" of a file that also ships `$schema`. Claude-Session: https://claude.ai/code/session_01GGixjxi5AQ2cNK62bBymfF
Part of #2 — the half that a published preset can actually carry.
A type-level test asserts with bindings nothing reads (
type _x = Expect<Equal<A, B>>), sonoUnusedLocalsandnoUnusedParametershave to be off for that project and on everywhere else. Every workspace with atsconfig.test-d.jsonwrote both flags out by hand, usually without the reason.{ "extends": ["./tsconfig.json", "@btravstack/tsconfig/test-d.json"], "include": ["src/**/*.test-d.ts"] }The preset comes last in the array so its relaxations win over the strict config beneath it.
It carries no
include, and cannotTypeScript resolves a base config's
include/exclude/filesrelative to the base file's own directory, so a shipped glob would point insidenode_modules. Measured rather than assumed — anincludeofsrc/**/*.test-d.tsin a base one directory up:So each workspace keeps its own glob, which is where it belongs anyway: a workspace that puts its type tests elsewhere needs a different glob, not a different preset.
scripts/validate.mjsnow refuses atest-d.jsoncarryinginclude,exclude,filesorextends, so that limit is held mechanically instead of remembered.On the rest of #2, which I measured and would rather not guess at
The issue's premise was "~262 lines of byte-identical copies" in
start, and "every btravstack monorepo with more than a couple of workspaces pays this copy tax". Measured today across all four repos, 52vitest.config.tsfiles:examples/Two findings that cut against a published vitest preset:
startalready solved it locally.vitest.shared.tsat the root, re-exported by five example workspaces as a one-liner. Its own comment records the decision the remaining duplication is deliberate under: "a workspace that needs more … writes its own config instead of extending this one — divergence should be visible in the workspace, not hidden in an override."setupFilesappears in 0 of unthrown's 15 configs;environment: "node"in 0 of temporal-contract's 5;include: ["src/**/*.spec.ts"]in 4 of amqp-contract's 8. A preset three of four repos must override on its headline defaults is not a preset.So my recommendation for acceptance criterion 1 is the repo-local
vitest.shared.tspattern replicated where it earns its keep, not a published package — which also avoids minting a new npm package and the Trusted Publisher setup that has now blocked two releases. But that is a call about your tooling policy rather than a fact, so I have left the criterion open rather than closing #2. Happy to do either.https://claude.ai/code/session_01GGixjxi5AQ2cNK62bBymfF
Summary by CodeRabbit
New Features
Documentation
Validation