🔀 Merge chore/straighten-oxc-rules into main

Note the finished work under [Unreleased] and mark the task and its
subtasks done.

.gitignore

@@ -10,5 +10,6 @@ coverage
 !.vscode/extensions.json
 !.vscode/settings.json
 !.vscode/tasks.json
+!.vscode/launch.json
 .idea
 .DS_Store

.oxlintrc.json

@@ -13,6 +13,8 @@
         "eslint/no-undefined": "off",
         "eslint/sort-keys": "off",
         "eslint/id-length": "off",
+        "eslint/capitalized-comments": "off",
+        "eslint/no-ternary": "off",
         "import/no-named-export": "off",
         "eslint/one-var": "off",
         "import/group-exports": "off",

.vscode/extensions.json

@@ -1,5 +1,6 @@
 {
     "recommendations": [
+        "connor4312.nodejs-testing",
         "oxc.oxc-vscode",
         "streetsidesoftware.code-spell-checker",
         "typescriptteam.native-preview",

.vscode/launch.json

@@ -0,0 +1,15 @@
+{
+    "version": "0.2.0",
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "Debug current test file",
+            "runtimeExecutable": "node",
+            "runtimeArgs": ["--test", "--strip-types"],
+            "args": ["${file}"],
+            "cwd": "${workspaceFolder}",
+            "console": "integratedTerminal"
+        }
+    ]
+}

.vscode/settings.json

@@ -1,4 +1,14 @@
 {
+    "nodejs-testing.extensions": [
+        {
+            "extensions": ["mjs", "cjs", "js"],
+            "parameters": []
+        },
+        {
+            "extensions": ["ts"],
+            "parameters": ["--strip-types"]
+        }
+    ],
     "[typescript]": {
         "editor.defaultFormatter": "oxc.oxc-vscode",
         "editor.formatOnSave": true

CHANGELOG.md

@@ -7,6 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+- allow ternaries and lowercase comments in oxlint
+- switch `src/primitive.ts` prose from block comments to line comments
+
+## [0.1.8] - 2026-09-16
+
+- upgrade dependencies
+- ignore `@types/node` in `maintain:outdated` (misleading `latest` dist-tag)
+- require extremely concise prose in `development/`
+
+## [0.1.7] - 2026-09-16
+
+- require a short summary under `[Unreleased]` in the changelog before a branch is finished
+- let `create:branch` start from a `main` that is ahead of its upstream, so a finished merge no longer blocks the next branch until it is pushed
+
 ## [0.1.6] - 2026-09-15
 
 - restructure the documentation: README.md for users, CONTRIBUTING.md for contributors, and development/ for the decisions, rejected alternatives and known issues
@@ -37,7 +51,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 - basic setup
 
-[Unreleased]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.6...main
+[Unreleased]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.8...main
+[0.1.8]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.7...0.1.8
+[0.1.7]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.6...0.1.7
 [0.1.6]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.5...0.1.6
 [0.1.5]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.4...0.1.5
 [0.1.4]: https://gitea.e1nsnull.de/tmu/tiny-pattern-ts/compare/0.1.3...0.1.4

CONTRIBUTING.md

@@ -67,6 +67,12 @@ before the implementation. The loop is **type → red → green → refactor**:
    `npm run verify` as the definition-of-done gate.
 
 Every test pairs an `expectTypeOf(...)` with an `assert.*`; keep them together.
+Each test body follows **AAA (Arrange–Act–Assert)** with labeled blocks
+separated by a blank line: `// Arrange` sets up the inputs (e.g. the matcher
+factory), `// Act` exercises the subject once from them (not a second
+throwaway call), `// Assert` holds every check — type expectations first,
+runtime assertions last; an empty block drops its label (see
+[development/testing.md § AAA ordering](./development/testing.md#aaa-ordering)).
 Type-first is enforced structurally: `npm test` runs `check:tsc` before the
 test runner, so a wrong type can never be papered over by a passing assertion.
 Per [AGENTS.md § Never do](./AGENTS.md#never-do), reach green honestly — fix the
@@ -164,11 +170,18 @@ reaches for by default:
 - **There is no local `npm run publish`, and `publish:publint` / `publish:attw`
   don't go in `check`.** (why:
   [development/publishing.md](./development/publishing.md#ci-only-publishing))
+- **A branch ends with a changelog note:** before `npm run create:finish`,
+  summarize the work under `[Unreleased]` in [CHANGELOG.md](./CHANGELOG.md).
+  (why:
+  [development/workflow.md](./development/workflow.md#changelog-notes))
 - **A decision or its rationale belongs in `development/`, not here.** This file
   holds the actionable rule; `development/<category>.md` holds why, the rejected
   alternatives and the known issues. When you change a rule, update its category
   file in the same commit and cross-link the two. (why:
   [development/README.md](./development/README.md))
+- **Prose in `development/` is extremely concise.** When adding or changing a
+  decision, write fragments if needed — sacrifice grammar for concision. (why:
+  [development/README.md § Decision blocks](./development/README.md#decision-blocks))
 
 ## Branching model
 
@@ -180,9 +193,10 @@ request workflow on Gitea yet.
 - **Branch naming:** `feature/<desc>` / `fix/<desc>` / `chore/<desc>`
 - **Starting work:** `npm run create:branch -- <prefix>/<desc>`. It refuses,
   without changing anything, unless the working tree is clean, no
-  merge/rebase/cherry-pick is in progress, `main` matches its upstream, and
+  merge/rebase/cherry-pick is in progress, `main` is not behind its upstream
-  `npm run test` is green on `main`. The prefix is _your_ call, inferred from the
+  (a local merge not yet pushed is fine — the push belongs to `create:release`),
-  task; the script validates it rather than guessing it.
+  and `npm run test` is green on `main`. The prefix is _your_ call, inferred from
+  the task; the script validates it rather than guessing it.
 - **Merging:** `npm run create:finish` (on the branch). It re-asserts the same
   preconditions, merges `--no-ff`, runs `npm run verify`, and deletes the branch
   only after the merge is green. The push is left to `create:release`, so the
@@ -192,8 +206,7 @@ request workflow on Gitea yet.
 - **Releases are NOT triggered by pushes.** Only the maintainer triggers a
   release; see [Publishing](#publishing).
 
-Full rationale, including the front-door decisions and a known issue about
+Full rationale, including the front-door decisions:
-`main` being ahead of its upstream between a merge and the next push:
 [development/workflow.md § Branching model](./development/workflow.md#branching-model).
 
 ## Submitting changes
@@ -204,9 +217,11 @@ as a branch that is merged locally:
 1. `npm run create:branch -- <prefix>/<desc>`.
 2. Commit your work (one or more commits, per the tests and style rules above).
 3. `npm run verify` — the definition of done.
-4. `npm run create:finish` to merge the branch into `main` and verify the
+4. Add a changelog note under `[Unreleased]` (see
+   [Rules the tools don't enforce](#rules-the-tools-dont-enforce)).
+5. `npm run create:finish` to merge the branch into `main` and verify the
    result.
-5. Present a handover for review. Once there are no further objections, the
+6. Present a handover for review. Once there are no further objections, the
    maintainer pushes.
 
 When the project is promoted to GitHub, this step becomes a normal pull request

backlog.tasks

@@ -5,9 +5,11 @@ Backlog and tracking for tiny-pattern-ts. Managed in vscode-todotasks format.
 ---
 
 Setup:
-✔ Add gitea release page in CI @high @done
-✔ Manually verify the Gitea release page on a real tag push (needs main) @high @done (9/15/2026, 1:18:15 PM)
 ☐ Split off template into separate package => pi --session 01a07dde-7050-7054-bb36-1606d7eb2bc3 @high
+✔ straighten oxc rules @done
+    ✔ oxc forbids ternary => remove oxc rule @done
+    ✔ oxc wants comments to start comments with a capital letter => remove oxc rule @done
+    ✔ there already exists a /* */ block comment in primitive.ts, => change to multi-line comment @done
 
 v1.0:
 ☐ API surface is stable and fully typed
@@ -22,37 +24,10 @@ v1.0:
 Bugs:
 
 Enhancements:
+☐ Allow boolean literals in primitive union patterns (e.g. `true: () => "yes"`) @medium
+☐ Are there other primitive types that should be supported in union patterns? (e.g. `bigint`, `symbol`) @medium
 
 Documentation:
-✔ Clean up CONTRIBUTING.md and README.md, create docs @done
-    ✔ Review existing documentation for accuracy and completeness @done
-    ✔ README.md should be the main entry point for users, and CONTRIBUTING.md should be the main entry point for contributors @done
-    ✔ Move the decisions, shortcomings and known issues out of README.md and CONTRIBUTING.md @done
-        ✔ Decided: category files under development/ (one per area), not ADRs. Each decision is a block with #### Decision (YYYY-MM) / #### Why / #### Rejected / #### Known issue; rationale in development/README.md @done
-        ✔ have a look at other well known repositories for inspiration on how to structure the docs @done
-        ✔ often times a docs folder is used, but this usually contains further user of the library documentation, that is deployed to a website. Deployment is out of scope for now @done
-        ✔ make sure to preserve that information in the new docs @done
-        ✔ development/README.md - index and decision-block convention @done
-        ✔ development/workflow.md - branching, script prefixes, feedback tiers, commits @done
-        ✔ development/tooling.md - toolchain decisions and editor setup @done
-        ✔ development/testing.md - type-driven testing @done
-        ✔ development/ci.md - pipeline, runner image, coverage serving @done
-        ✔ development/publishing.md - release and npm publishing @done
-        ✔ development/library.md - public API design and its limitations @done
-    ✔ README.md @done
-        ✔ I really like the order perl documentation does it: name with a single line description, version, Synopsis, Description, examples, API reference, license @done
-            (example: https://metacpan.org/pod/Scalar::Util)
-        ✔ should include a clear description of the library, its purpose, and how to use it @done
-        ✔ Add usage examples to README.md @done
-        ✔ version needs to be kept in sync with package.json in release.sh @done
-        ✔ Not every section in current README fits in the above order, so put them in another file @done
-    ✔ CONTRIBUTING.md @done
-        ✔ should include instructions for how to contribute to the project, including how to set up a development environment, run tests, and submit pull requests @done
-        ✔ should include guidelines for code style and formatting and a hint, that vscode extensions are suggested from .vscode/extensions.json @done
-        ✔ Not every section in current CONTRIBUTING.md fits in, so put them in another file @done
-
-
-
 ☐ Create `examples/` directory with runnable snippets
 ☐ Add comparison section vs. other TS pattern-matching libs in Readme.md
 ☐ Write migration guide for users coming from discriminated unions
@@ -60,14 +35,11 @@ Documentation:
 ☐ Validate code fences in Markdown (start with README.md) — compile the TypeScript examples against `src/` so the docs cannot drift from the API
 
 Workflow:
-☐ Resolve the finish/push tension: `create:finish` leaves `main` ahead of its upstream while `create:branch` refuses until `main` matches upstream — decide whether `finish` should push or `branch` should compare only `BEHIND` (see development/workflow.md)
+✔ Resolve the finish/push tension: `create:finish` leaves `main` ahead of its upstream while `create:branch` refuses until `main` matches upstream — decide whether `finish` should push or `branch` should compare only `BEHIND` (see development/workflow.md) @done
 
 Maintenance:
 ☐ Serve CI coverage over a tiny self-hosted webserver (replace the zip artifact) @low
-    ✔ Add a minimal dir-listing webserver to the gitea docker setup (e.g. caddy `file_server browse` reusing the existing reverse proxy, or any single-binary static server, lipanski/docker-static-website) @done (9/13/2026, 9:02:37 PM)
-    ✔ drop the `actions/upload-artifact` coverage step in favour of the shared-dir layout @done (9/13/2026, 10:37:22 PM)
     ☐ Explore serving coverage for non-tag pushes (e.g. `main/coverage`, PR previews) @low
-    ✔ Manually verify the coverage was created on a real tag push (needs main) @low @done (9/14/2026, 1:55:03 PM)
     → design: no deploy step in CI; the webserver just exposes the shared directory (decided over Gitea Pages / Codecov — neither confirmed available/ wanted)
 ☐ serve docs over self hosted server @low
     ☐ Add a minimal dir-listing webserver to the gitea docker setup for serving docs (reuse existing reverse proxy)
@@ -77,19 +49,3 @@ Maintenance:
     ☐ Add a minimal dir-listing webserver to the gitea docker setup for serving landing page (reuse existing reverse proxy)
     ☐ CI writes landing page to a shared volume keyed by project + tag (e.g. `/landing/tiny-pattern-ts/<tag>/`)
     ☐ Browse to `…/tiny-pattern-ts/index.html` in the browser
-✔ Stop Gitea CI re-downloading Node on every job @done
-    ✔ Share the warm npm cache with the publish job @done
-    ✔ Bake Node into the CI job image (docker/Dockerfile, container.image in ci.yml) @done
-    ✔ Build/push gitea.e1nsnull.de/tmu/act-ci:26.8.2 and confirm setup-node skips the download @done
-    ✔ Write the `<version>/x64.complete` marker — actions/tool-cache ignores a bare directory, so the probe missed and the download continued @done
-    ✔ Log tool-cache state from the job container to find it (temporary, removed once understood) @done
-    ✔ Guard the invariant in CI (`Assert the baked tool cache is present`) @done
-✘ Enable force-pull for the runner so a changed act-ci image is never missed @low @cancelled
-    → decided against: it is acceptable to miss a runner-side image change, and the image is only rebuilt on a Node bump, which changes the tag anyway. A Dockerfile-only change re-pushed under an unchanged tag is a known issue with a manual `docker rmi` workaround (see development/ci.md).
-✔ Improve CI publish @done
-    ✔ Check whether publish job is only run on tags, if not, guard it @done
-    ✔ Gate only single steps @done
-        ✔ Do not publish to npm, if NPM_TOKEN is not set (e.g. PRs from forks) @done
-        ✔ Do not publish to Gitea — uses the run's automatic `github.token`, so no secret gate is needed @done
-        ✔ Otherwise run the steps @done
-        ✔ Fail the job unless both the Gitea release and npm publish succeeded @done

cspell.json

@@ -42,7 +42,8 @@
         "bestikk",
         "silverwind",
         "idris",
-        "todotasks"
+        "todotasks",
+        "connor"
     ],
     "ignorePaths": ["dist", "node_modules", "coverage", "*.svg", ".gitignore"]
 }

development/README.md

@@ -66,6 +66,9 @@ of downloading per job.
   goes under a `## Known issues` section at the end of the file.
 - Replace a superseded decision in place rather than archiving it; git history
   is the archive.
+- Terse is the point: humans skim and agents imitate the style already in the
+  file, so verbosity compounds edit over edit. Grammar loses to density here on
+  purpose.
 
 ## Adding to these docs
 

development/testing.md

@@ -36,10 +36,38 @@ The runner is `node --test --strip-types "src/**/*.test.ts"` and the tiers are i
 build step, and the runner relies on the `.ts` import-extension convention (see
 [tooling.md](./tooling.md#source-imports-use-ts-extensions)).
 
+## AAA ordering
+
+The rule is in
+[CONTRIBUTING.md § Testing discipline (type-driven)](../CONTRIBUTING.md#testing-discipline-type-driven).
+
+#### Decision (2026-09)
+
+Test bodies read arrange → act → assert: inputs (the factory) set up first, the
+subject exercised once from them, all checks last — types then runtime. The
+blocks are labeled with `// Arrange` / `// Act` / `// Assert` comments and
+separated by a blank line; an empty block drops its label.
+
+#### Why
+
+- Interleaved setup/checks hide what runs vs. what is observed; the eye
+  re-reads the block to find the seams.
+- A factory built mid-test invites a second throwaway call of the subject;
+  arranging it once makes the positive construction and the negative
+  `Parameters<…>` check share one source of truth.
+- Labels make the seams explicit, not inferred — grep-able and reviewable
+  without reading the statements.
+
+#### Rejected
+
+- Unlabeled ordering (bare blank lines): the seams still have to be found by
+  reading; the labels cost nothing.
+
 ## Known issues
 
 - The type-aware linter misidentifies `expectTypeOf()` as a floating promise, so
-  `src/index.test.ts` carries a file-level `oxlint-disable
+  test files that use it (`src/index.test.ts`, `src/primitive.test.ts`) carry a
+  file-level `oxlint-disable
 typescript/no-floating-promises` with an explanatory comment. It is a known
   false positive, not a rule worth disabling project-wide (see
   [tooling.md § oxlint-disable directives live next to the code](./tooling.md#oxlint-disable-directives-live-next-to-the-code)).

development/tooling.md

@@ -104,25 +104,48 @@ Type-aware oxlint is enabled via `options.typeAware: true` in `.oxlintrc.json`
 
 #### Decision (2026-09)
 
-Known type-aware false positives are silenced with source-level `oxlint-disable`
+A type-aware rule that false-positives is silenced with a source-level
-directives (see `src/pattern.ts`, `src/match.ts`, `src/index.test.ts`), not with
+`oxlint-disable` directive (see `src/pattern.ts`, `src/match.ts`,
-rules disabled in `.oxlintrc.json`.
+`src/index.test.ts`), not by turning the rule off in `.oxlintrc.json`.
 
 #### Why
 
 - The disable sits next to the code it silences, visible to anyone reading the
   source.
+- The rule stays on everywhere else, so only the mis-firing line is exempted.
 
 #### Rejected
 
-- A project-wide disable in `.oxlintrc.json`: it hides the suppression from the
+- A project-wide disable in `.oxlintrc.json` for a false positive: it hides the
-  reader of the affected code.
+  exemption from the reader of the affected code and switches the rule off
+  repo-wide for a one-site problem.
 
 #### Known issue
 
 - A source-level disable is a _human_ last resort. AI agents must not add one;
   they fix the type at its root (see [AGENTS.md § Never do](../AGENTS.md#never-do)).
 
+### Unwanted stylistic rules are turned off in the config
+
+#### Decision (2026-09)
+
+A stylistic rule the project rejects is `"off"` in the `.oxlintrc.json` `rules`
+map, not silenced at a use site. Current entries: `eslint/capitalized-comments`
+(comments may start lowercase) and `eslint/no-ternary` (ternaries are allowed),
+joining the oxfmt-superseded rules already off.
+
+#### Why
+
+- The rule is wrong for the whole project, not mis-firing at one site, so there
+  is no line to annotate.
+- Keeping the two mechanisms separate keeps a source-level `oxlint-disable`
+  meaningful: it marks a lone exception.
+
+#### Rejected
+
+- A source-level `oxlint-disable` per use: the same exemption repeated at every
+  site, and oxfmt can move the site.
+
 ### `check:tsc` runs first
 
 #### Decision (2026-09)
@@ -163,6 +186,28 @@ rules disabled in `.oxlintrc.json`.
   are part of the public API.
 - The narrower scope keeps the signal high without config-file boilerplate.
 
+### `maintain:outdated` ignores `@types/node`
+
+#### Decision (2026-09)
+
+Pass `--ignore-packages @types/node`.
+
+#### Why
+
+- DT pins `@types/node`'s `latest` dist-tag to LTS (22.x); current-line types
+  ride other tags. Scan sees latest < installed — permanent "reverted", exit
+  1, zero signal. `--ignore-pre-releases` no help: 22.20.3 is stable.
+
+#### Rejected
+
+- `--types major,minor,patch`: hides real reverted reports elsewhere.
+- `@types/node@26.*`: tag stays wrong across majors; un-pin per bump = ritual.
+
+#### Known issue
+
+- A genuinely behind `@types/node` goes unreported; match it to
+  `.node-version` by hand.
+
 ### `attw` targets ESM-only
 
 #### Decision (2026-09)

development/workflow.md

@@ -26,7 +26,10 @@ plus hand-written `git`.
   gate is not paid on an ineligible tree.
 - The merge half owns the post-merge `npm run verify`, so a merge cannot land
   unverified. The push stays with `create:release` so the merge is reviewed
-  locally first.
+  locally first; `main` is therefore routinely ahead of its upstream between a
+  merge and the release that ships it. `create:branch` requires only that `main`
+  is not _behind_ — matching `create:finish`, which tolerates the local merge and
+  fast-forwards over a remote one — rather than an exact match.
 - Every failure is non-mutating except the baseline test, which runs on `main`
   after switching there: a red `main` restores the branch you started on, and a
   merge conflict aborts back to the feature branch rather than stranding a
@@ -42,12 +45,39 @@ plus hand-written `git`.
   can run from a dirty tree.
 - Fast-forward instead of `--no-ff`: `--no-ff` keeps each unit of work visible
   in `git log`.
+- Pushing from `create:finish` to keep `main` level with its upstream: it would
+  trade the local review the push waits for for a network side effect, and a
+  failed push would leave the merge landed but unpublished.
 
-#### Known issue
+## Changelog notes
 
-- `create:finish` does not push, so `main` is ahead of `origin/main` between a
+The rule is in
-  merge and the next push. `create:branch` requires `main` to match its upstream
+[CONTRIBUTING.md § Rules the tools don't enforce](../CONTRIBUTING.md#rules-the-tools-dont-enforce).
-  and refuses until it is pushed; push `main` before starting the next branch.
+
+#### Decision (2026-09)
+
+A merged branch carries its own summary under `[Unreleased]` in
+[CHANGELOG.md](../CHANGELOG.md), added before `create:finish`;
+`create:release` graduates it into the tagged section (see
+[publishing.md](./publishing.md)).
+
+#### Why
+
+- `create:release` derives the bump heuristic from the `[Unreleased]` body, so
+  the notes must exist before release day.
+- The contributor has fresh context; at release day the intent of a branch is
+  only its diff.
+- Gitmoji subjects are signposts, not semantic keys, so notes cannot be derived
+  from the history.
+
+#### Rejected
+
+- Generating notes from subjects at release time: subjects carry no parseable
+  type/scope (see § Commit messages).
+- The maintainer writing one summary during `create:release`: reconstruction
+  after the fact.
+- Enforcing it in `create:finish`: the front doors assert git state, not
+  content — and _notable_ is exactly the judgment a tool cannot make.
 
 ## Script prefix convention
 

package-lock.json

@@ -1,22 +1,25 @@
 {
     "name": "tiny-pattern-ts",
-    "version": "0.1.6",
+    "version": "0.1.8",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "tiny-pattern-ts",
-            "version": "0.1.6",
+            "version": "0.1.8",
             "license": "MIT",
+            "dependencies": {
+                "type-fest": "^5.9.0"
+            },
             "devDependencies": {
                 "@arethetypeswrong/cli": "^0.18.5",
                 "@runwisp/pubv": "^1.5.1",
                 "@tsconfig/node26": "^26.0.1",
                 "@tsconfig/strictest": "^2.0.8",
-                "@types/node": "^26.4.1",
+                "@types/node": "^26.6.1",
                 "c8": "^12.0.0",
                 "check-outdated": "^3.0.0",
-                "cspell": "^10.2.2",
+                "cspell": "^10.3.2",
                 "expect-type": "1.4.0",
                 "knip": "^6.34.0",
                 "lefthook": "^2.1.12",
@@ -122,9 +125,9 @@
             }
         },
         "node_modules/@cspell/cspell-bundled-dicts": {
-            "version": "10.3.1",
+            "version": "10.3.2",
-            "resolved": "https://registry.npmjs.org/@cspell/cspell-bundled-dicts/-/cspell-bundled-dicts-10.3.1.tgz",
+            "resolved": "https://registry.npmjs.org/@cspell/cspell-bundled-dicts/-/cspell-bundled-dicts-10.3.2.tgz",
-            "integrity": "sha512-wHRmqaHrhmPHxsnYs9JhYCwD+lLsIOltbvaK9XfIkisblfBCjvsSihsJZhVEvSQ2pPNqESUaOQnBBeVbqv52qA==",
+            "integrity": "sha512-b0f6fQCwcTP32dsibbPbdU2m5R0ZAwAVaB1u04187OqfRBJxr2m77bAXa50xSsjonRILLAGzxgT4+HkPojIBpA==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
@@ -193,22 +196,22 @@
             }
         },
         "node_modules/@cspell/cspell-json-reporter": {
-            "version": "10.3.1",
+            "version": "10.3.2",
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+            "resolved": "https://registry.npmjs.org/cspell-lib/-/cspell-lib-10.3.2.tgz",
-            "integrity": "sha512-msDAL+F0suXMTFj6OCWPmeBUNUe+19Bb1yPtOkbGVBU65K7sKHfwjCt8ev3iTdhhIKi8hIaq6xmJShBb1vznmw==",
+            "integrity": "sha512-svq9qWoMY58/BdyEQwY1YJhDKrmE8/z4VIiwvtgNkxV/km/6wPTNvm2iQNI4VjSa+DWYSvHyX16LwNjrcGp0sw==",
             "dev": true,
             "license": "MIT",
             "dependencies": {
-                "@cspell/cspell-bundled-dicts": "10.3.1",
+                "@cspell/cspell-bundled-dicts": "10.3.2",
-                "@cspell/cspell-performance-monitor": "10.3.1",
+                "@cspell/cspell-performance-monitor": "10.3.2",
-                "@cspell/cspell-pipe": "10.3.1",
+                "@cspell/cspell-pipe": "10.3.2",
-                "@cspell/cspell-resolver": "10.3.1",
+                "@cspell/cspell-resolver": "10.3.2",
-                "@cspell/cspell-types": "10.3.1",
+                "@cspell/cspell-types": "10.3.2",
-                "@cspell/dynamic-import": "10.3.1",
+                "@cspell/dynamic-import": "10.3.2",
-                "@cspell/filetypes": "10.3.1",
+                "@cspell/filetypes": "10.3.2",
-                "@cspell/rpc": "10.3.1",
+                "@cspell/rpc": "10.3.2",
-                "@cspell/strong-weak-map": "10.3.1",
+                "@cspell/strong-weak-map": "10.3.2",
-                "@cspell/url": "10.3.1",
+                "@cspell/url": "10.3.2",
-                "cspell-config-lib": "10.3.1",
+                "cspell-config-lib": "10.3.2",
-                "cspell-dictionary": "10.3.1",
+                "cspell-dictionary": "10.3.2",
-                "cspell-glob": "10.3.1",
+                "cspell-glob": "10.3.2",
-                "cspell-grammar": "10.3.1",
+                "cspell-grammar": "10.3.2",
-                "cspell-io": "10.3.1",
+                "cspell-io": "10.3.2",
-                "cspell-trie-lib": "10.3.1",
+                "cspell-trie-lib": "10.3.2",
                 "env-paths": "^4.0.0",
                 "gensequence": "^8.0.8",
                 "import-fresh": "^4.0.0",
@@ -3294,16 +3296,16 @@
             }
         },
         "node_modules/cspell-trie-lib": {
-            "version": "10.3.1",
+            "version": "10.3.2",
-            "resolved": "https://registry.npmjs.org/cspell-trie-lib/-/cspell-trie-lib-10.3.1.tgz",
+            "resolved": "https://registry.npmjs.org/cspell-trie-lib/-/cspell-trie-lib-10.3.2.tgz",
-            "integrity": "sha512-6mJGGPEtD4CMoq9qxmRIa+XB7BgLPTgDSGFn1FluNbhF/x3VFeSErcTO+lcfqQhAdAZvEIqptzKt/m6CJJUUPg==",
+            "integrity": "sha512-YYberpBG16hLviQHLkciXjtqEUc6Q7f9UL71GlJAflSD9TYFuXIvhpIYV80YXPyDrh2Jk3ZYeUqWLQmpZjKaeQ==",
             "dev": true,
             "license": "MIT",
             "engines": {
                 "node": ">=22.18.0"
             },
             "peerDependencies": {
-                "@cspell/cspell-types": "10.3.1"
+                "@cspell/cspell-types": "10.3.2"
             }
         },
         "node_modules/cspell/node_modules/chalk": {
@@ -3416,13 +3418,6 @@
                 "node": ">=6.0.0"
             }
         },
-        "node_modules/fast-json-stable-stringify": {
-            "version": "2.1.0",
-            "resolved": "https://registry.npmjs.org/fast-json-stable-stringify/-/fast-json-stable-stringify-2.1.0.tgz",
-            "integrity": "sha512-lhd/wF+Lk98HZoTCtlVraHtfh5XYijIjalXck7saUtuanSDyLMxnHhSXEDJqHxD7msR8D0uCmqlkwjCV8xvwHw==",
-            "dev": true,
-            "license": "MIT"
-        },
         "node_modules/fd-package-json": {
             "version": "2.0.0",
             "resolved": "https://registry.npmjs.org/fd-package-json/-/fd-package-json-2.0.0.tgz",
@@ -4630,6 +4625,18 @@
                 "url": "https://github.com/chalk/supports-hyperlinks?sponsor=1"
             }
         },
+        "node_modules/tagged-tag": {
+            "version": "1.0.0",
+            "resolved": "https://registry.npmjs.org/tagged-tag/-/tagged-tag-1.0.0.tgz",
+            "integrity": "sha512-yEFYrVhod+hdNyx7g5Bnkkb0G6si8HJurOoOEgC8B/O0uXLHlaey/65KRv6cuWBNhBgHKAROVpc7QyYqE5gFng==",
+            "license": "MIT",
+            "engines": {
+                "node": ">=20"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
+            }
+        },
         "node_modules/test-exclude": {
             "version": "8.0.0",
             "resolved": "https://registry.npmjs.org/test-exclude/-/test-exclude-8.0.0.tgz",
@@ -4713,6 +4720,21 @@
             "license": "0BSD",
             "optional": true
         },
+        "node_modules/type-fest": {
+            "version": "5.9.0",
+            "resolved": "https://registry.npmjs.org/type-fest/-/type-fest-5.9.0.tgz",
+            "integrity": "sha512-yANm3Jr3GiJ1qgJlxGAVxTOIcEOk1rhQHamlXtnrCK7EHP4HeM9OGxtMg/W7HFdrVzw/ZWJKGVIJusVH85sLtw==",
+            "license": "(MIT OR CC0-1.0)",
+            "dependencies": {
+                "tagged-tag": "^1.0.0"
+            },
+            "engines": {
+                "node": ">=20"
+            },
+            "funding": {
+                "url": "https://github.com/sponsors/sindresorhus"
+            }
+        },
         "node_modules/typescript": {
             "version": "7.0.2",
             "resolved": "https://registry.npmjs.org/typescript/-/typescript-7.0.2.tgz",

package.json

@@ -1,6 +1,6 @@
 {
     "name": "tiny-pattern-ts",
-    "version": "0.1.6",
+    "version": "0.1.8",
     "description": "Pattern matching for TypeScript/ESM environments (F#-style, not regex)",
     "keywords": [
         "adt",
@@ -53,7 +53,7 @@
         "create:release": "./scripts/release.sh",
         "maintain": "npm run maintain:knip; npm run maintain:outdated",
         "maintain:knip": "knip --include dependencies,exports,files",
-        "maintain:outdated": "check-outdated --ignore-pre-releases",
+        "maintain:outdated": "check-outdated --ignore-pre-releases --ignore-packages @types/node",
         "test": "npm run check:tsc && node --test --strip-types \"src/**/*.test.ts\"",
         "test:ci": "c8 --reporter=text --reporter=lcov --reporter=html node --test --strip-types \"src/**/*.test.ts\"",
         "test:unit": "node --test --strip-types \"src/**/*.test.ts\"",
@@ -65,15 +65,18 @@
         "setup": "npm run setup:git-commit-message",
         "setup:git-commit-message": "git config commit.template commit-message-template"
     },
+    "dependencies": {
+        "type-fest": "^5.9.0"
+    },
     "devDependencies": {
         "@arethetypeswrong/cli": "^0.18.5",
         "@runwisp/pubv": "^1.5.1",
         "@tsconfig/node26": "^26.0.1",
         "@tsconfig/strictest": "^2.0.8",
-        "@types/node": "^26.4.1",
+        "@types/node": "^26.6.1",
         "c8": "^12.0.0",
         "check-outdated": "^3.0.0",
-        "cspell": "^10.2.2",
+        "cspell": "^10.3.2",
         "expect-type": "1.4.0",
         "knip": "^6.34.0",
         "lefthook": "^2.1.12",

scripts/branch.sh

@@ -86,12 +86,14 @@ if [ -n "${UPSTREAM}" ]; then
         echo "       refusing to branch on a possibly stale '${BASE}'." >&2
         exit 1
     }
+    # Only *behind* is a problem. `create:finish` deliberately leaves the local
+    # merge on '${BASE}' until `create:release` pushes it, so being ahead is the
+    # normal state between a merge and the release that ships it; branching from
+    # those commits is intended. Missing remote commits is not.
     BEHIND=$(git rev-list --count "${BASE}..${UPSTREAM}")
-    AHEAD=$(git rev-list --count "${UPSTREAM}..${BASE}")
+    if [ "${BEHIND}" -ne 0 ]; then
-    if [ "${BEHIND}" -ne 0 ] || [ "${AHEAD}" -ne 0 ]; then
+        echo "error: '${BASE}' is behind '${UPSTREAM}' (by ${BEHIND})." >&2
-        echo "error: '${BASE}' has diverged from '${UPSTREAM}' (ahead ${AHEAD}, behind ${BEHIND})." >&2
+        echo "       update it: git switch ${BASE} && git pull --ff-only" >&2
-        [ "${AHEAD}" -ne 0 ] && echo "       not yet pushed commits on '${BASE}': push them, or rebase this work onto them." >&2
-        [ "${BEHIND}" -ne 0 ] && echo "       update it: git switch ${BASE} && git pull --ff-only" >&2
         exit 1
     fi
 else

src/index.test.ts

@@ -7,44 +7,59 @@ import { expectTypeOf } from "expect-type";
 import { type Matcher, P, match } from "./index.ts";
 
 test("match returns a builder", () => {
+    // Act
     const builder = match("x");
+
+    // Assert
     expectTypeOf(builder).toHaveProperty("with");
     expectTypeOf(builder).toHaveProperty("exhaustive");
     expectTypeOf(builder).toHaveProperty("otherwise");
 });
 
 test("P.literal narrows to its literal type", () => {
+    // Act
     const matcher = P.literal("yes");
-    expectTypeOf(matcher).toMatchTypeOf<Matcher<"yes">>();
+
+    // Assert
+    expectTypeOf(matcher).toExtend<Matcher<"yes">>();
     assert.equal(matcher.matches("yes"), true);
     assert.equal(matcher.matches("no"), false);
 });
 
 test("P.type narrows to the typeof target", () => {
+    // Act
     const matcher = P.type<string>("string");
-    expectTypeOf(matcher).toMatchTypeOf<Matcher<string>>();
+
+    // Assert
+    expectTypeOf(matcher).toExtend<Matcher<string>>();
     assert.equal(matcher.matches("hi"), true);
     assert.equal(matcher.matches(42), false);
 });
 
 test("exhaustive() returns the union of handler return types", () => {
+    // Act
     const result = match<"a" | "b">("a")
         .with(P.literal("a"), () => 1 as const)
         .with(P.literal("b"), () => "two" as const)
         .exhaustive();
 
+    // Assert
     expectTypeOf(result).toEqualTypeOf<1 | "two">();
     assert.equal(result, 1);
 });
 
 test("otherwise() falls back when no case matches", () => {
+    // Act
     const result = match<"x" | "y" | "z">("z")
         .with(P.literal("x"), (v): string => `got ${v}`)
         .otherwise((v): string => `fallback ${v}`);
+
+    // Assert
     assert.equal(result, "fallback z");
 });
 
 test("exhaustive throws when no case matches", () => {
+    // Assert
     assert.throws(
         () =>
             match<"a" | "b" | "c">("c")

src/primitive.test.ts

@@ -0,0 +1,357 @@
+/* oxlint-disable typescript/no-floating-promises -- expectTypeOf() is a sync type-assertion library that the type-aware linter misidentifies as a promise */
+import { strict as assert } from "node:assert";
+import { test } from "node:test";
+
+import { expectTypeOf } from "expect-type";
+
+import {
+    getPrimitiveUnionMatcher,
+    getPrimitiveUnionMatcherPartial,
+    getPrimitiveUnionMatcherPartialW,
+    getPrimitiveUnionMatcherW,
+} from "./primitive.ts";
+
+// ============================================================================
+// API: getPrimitiveUnionMatcherW — ✔️ Exhaustive / ❌ ReturnsStrict
+// ============================================================================
+
+test("getPrimitiveUnionMatcherW requires every literal key", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherW<"a" | "b">();
+
+    // Act
+    const matcher = factory({
+        a: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return 1 as const;
+        },
+        b: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"b">();
+            return "two" as const;
+        },
+    });
+
+    // Assert
+    // ❌ ReturnsStrict: mixed handler returns widen to their union.
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b") => 1 | "two">();
+    // A pattern missing a key must not satisfy the parameter type.
+    expectTypeOf<{
+        a: () => number;
+    }>().not.toExtend<Parameters<typeof factory>[0]>();
+    assert.equal(matcher("a"), 1);
+    assert.equal(matcher("b"), "two");
+});
+
+test("getPrimitiveUnionMatcherW dispatches on numeric literal keys", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherW<1 | 2>();
+
+    // Act
+    const matcher = factory({
+        1: (n) => {
+            expectTypeOf(n).toEqualTypeOf<1>();
+            return n + 1;
+        },
+        2: (n) => {
+            expectTypeOf(n).toEqualTypeOf<2>();
+            return n * 10;
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<(shape: 1 | 2) => number>();
+    assert.equal(matcher(1), 2);
+    assert.equal(matcher(2), 20);
+});
+
+test("getPrimitiveUnionMatcherW dispatches on mixed string and numeric keys", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherW<"a" | "b" | 1 | 2>();
+
+    // Act
+    const matcher = factory({
+        a: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return "A" as const;
+        },
+        b: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"b">();
+            return "B" as const;
+        },
+        1: (n) => {
+            expectTypeOf(n).toEqualTypeOf<1>();
+            return 10 as const;
+        },
+        2: (n) => {
+            expectTypeOf(n).toEqualTypeOf<2>();
+            return 20 as const;
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<
+        (shape: "a" | "b" | 1 | 2) => "A" | "B" | 10 | 20
+    >();
+    assert.equal(matcher("a"), "A");
+    assert.equal(matcher("b"), "B");
+    assert.equal(matcher(1), 10);
+    assert.equal(matcher(2), 20);
+});
+
+// ============================================================================
+// API: getPrimitiveUnionMatcher — ✔️ Exhaustive / ✔️ ReturnsStrict
+// ============================================================================
+
+test("getPrimitiveUnionMatcher infers a single return type shared by all handlers", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcher<"a" | "b">();
+
+    // Act
+    const matcher = factory({
+        a: (s): number => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return 1;
+        },
+        b: (s): 1 | 2 => {
+            expectTypeOf(s).toEqualTypeOf<"b">();
+            return 2;
+        },
+    });
+
+    // Assert
+    // ✔️ ReturnsStrict: R is the best common return type, not a widening union.
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b") => number>();
+    assert.equal(matcher("a"), 1);
+    assert.equal(matcher("b"), 2);
+});
+
+test("getPrimitiveUnionMatcher handlers receive the matched literal", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcher<"on" | "off">();
+
+    // Act
+    const matcher = factory({
+        on: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"on">();
+            return `handler ${s}`;
+        },
+        off: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"off">();
+            return `handler ${s}`;
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "on" | "off") => string>();
+    assert.equal(matcher("on"), "handler on");
+    assert.equal(matcher("off"), "handler off");
+});
+
+test("getPrimitiveUnionMatcher infers one return type across mixed string and numeric keys", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcher<"a" | "b" | 1 | 2>();
+
+    // Act
+    const matcher = factory({
+        a: (s): number => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return 1;
+        },
+        b: (s): 1 | 2 => {
+            expectTypeOf(s).toEqualTypeOf<"b">();
+            return 2;
+        },
+        1: (n): number => {
+            expectTypeOf(n).toEqualTypeOf<1>();
+            return 10;
+        },
+        2: (n): number => {
+            expectTypeOf(n).toEqualTypeOf<2>();
+            return 20;
+        },
+    });
+
+    // Assert
+    // ✔️ ReturnsStrict: R is the best common return type, not a widening union.
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b" | 1 | 2) => number>();
+    assert.equal(matcher("a"), 1);
+    assert.equal(matcher("b"), 2);
+    assert.equal(matcher(1), 10);
+    assert.equal(matcher(2), 20);
+});
+
+// ============================================================================
+// API: getPrimitiveUnionMatcherPartial — ❌ Exhaustive / ✔️ ReturnsStrict
+// ============================================================================
+
+test("getPrimitiveUnionMatcherPartial routes shapes without a handler to _", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherPartial<"a" | "b" | "c">();
+    // Two keys, so `{ a }` lacks only the `_` fallback, nothing else.
+    const sparseFactory = getPrimitiveUnionMatcherPartial<"a" | "b">();
+
+    // Act
+    const matcher = factory({
+        a: (s): 1 | 2 => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return 1;
+        },
+        _: (s): 1 | 2 => {
+            // The fallback sees the whole union, not a single literal.
+            expectTypeOf(s).toEqualTypeOf<"a" | "b" | "c">();
+            return 2;
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b" | "c") => 1 | 2>();
+    // ❌ Exhaustive: gaps are allowed, but only with a `_` fallback.
+    expectTypeOf<{
+        a: () => number;
+    }>().not.toExtend<Parameters<typeof sparseFactory>[0]>();
+    assert.equal(matcher("a"), 1);
+    assert.equal(matcher("b"), 2);
+    assert.equal(matcher("c"), 2);
+});
+
+test("getPrimitiveUnionMatcherPartial also accepts an exhaustive pattern", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherPartial<"a" | "b">();
+
+    // Act
+    const matcher = factory({
+        a: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return "A";
+        },
+        b: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"b">();
+            return "B";
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b") => string>();
+    assert.equal(matcher("a"), "A");
+    assert.equal(matcher("b"), "B");
+});
+
+test("getPrimitiveUnionMatcherPartial routes mixed string and numeric keys, gaps go to _", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherPartial<"a" | "b" | 1 | 2>();
+
+    // Act
+    const matcher = factory({
+        a: (s): string => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return "A";
+        },
+        1: (n): string => {
+            expectTypeOf(n).toEqualTypeOf<1>();
+            return "one";
+        },
+        _: (s): string => {
+            // The fallback sees the whole union, not a single literal.
+            expectTypeOf(s).toEqualTypeOf<"a" | "b" | 1 | 2>();
+            return "fallback";
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "a" | "b" | 1 | 2) => string>();
+    assert.equal(matcher("a"), "A");
+    assert.equal(matcher("b"), "fallback");
+    assert.equal(matcher(1), "one");
+    assert.equal(matcher(2), "fallback");
+});
+
+// ============================================================================
+// API: getPrimitiveUnionMatcherPartialW — ❌ Exhaustive / ❌ ReturnsStrict
+// ============================================================================
+
+test("getPrimitiveUnionMatcherPartialW allows gaps and widens to the union of handler returns", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherPartialW<"x" | "y" | "z">();
+    // Two keys, so `{ x }` lacks only the `_` fallback, nothing else.
+    const sparseFactory = getPrimitiveUnionMatcherPartialW<"x" | "y">();
+
+    // Act
+    const matcher = factory({
+        x: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"x">();
+            return 1 as const;
+        },
+        _: (s) => {
+            // The fallback sees the whole union, not a single literal.
+            expectTypeOf(s).toEqualTypeOf<"x" | "y" | "z">();
+            return "fallback" as const;
+        },
+    });
+
+    // Assert
+    expectTypeOf(matcher).toEqualTypeOf<
+        (shape: "x" | "y" | "z") => 1 | "fallback"
+    >();
+    // ❌ Exhaustive: gaps are allowed, but only with a `_` fallback.
+    expectTypeOf<{
+        x: () => number;
+    }>().not.toExtend<Parameters<typeof sparseFactory>[0]>();
+    assert.equal(matcher("x"), 1);
+    assert.equal(matcher("y"), "fallback");
+    assert.equal(matcher("z"), "fallback");
+});
+
+test("getPrimitiveUnionMatcherPartialW widens mixed string and numeric key returns to their union", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherPartialW<"a" | "b" | 1 | 2>();
+
+    // Act
+    const matcher = factory({
+        a: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"a">();
+            return "A" as const;
+        },
+        1: (n) => {
+            expectTypeOf(n).toEqualTypeOf<1>();
+            return 10 as const;
+        },
+        _: (s) => {
+            // The fallback sees the whole union, not a single literal.
+            expectTypeOf(s).toEqualTypeOf<"a" | "b" | 1 | 2>();
+            return "fallback" as const;
+        },
+    });
+
+    // Assert
+    // ❌ ReturnsStrict: mixed handler returns widen to their union.
+    expectTypeOf(matcher).toEqualTypeOf<
+        (shape: "a" | "b" | 1 | 2) => "A" | 10 | "fallback"
+    >();
+    assert.equal(matcher("a"), "A");
+    assert.equal(matcher("b"), "fallback");
+    assert.equal(matcher(1), 10);
+    assert.equal(matcher(2), "fallback");
+});
+
+test("getPrimitiveUnionMatcherPartialW also accepts an exhaustive pattern", () => {
+    // Arrange
+    const factory = getPrimitiveUnionMatcherPartialW<"x" | "y">();
+
+    // Act
+    const matcher = factory({
+        x: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"x">();
+            return 1 as const;
+        },
+        y: (s) => {
+            expectTypeOf(s).toEqualTypeOf<"y">();
+            return "two" as const;
+        },
+    });
+
+    // Assert
+    // ❌ ReturnsStrict: mixed handler returns widen to their union.
+    expectTypeOf(matcher).toEqualTypeOf<(shape: "x" | "y") => 1 | "two">();
+    assert.equal(matcher("x"), 1);
+    assert.equal(matcher("y"), "two");
+});

src/primitive.ts

@@ -0,0 +1,71 @@
+import type { Simplify, ValueOf } from "type-fest";
+
+type UnaryFn<T, R> = (shape: T) => R;
+
+// ============================================================================
+// ✔️ Exhaustive
+// ❌ ReturnsStrict
+// ============================================================================
+type PatternPrimitiveUnion<R, T extends string | number> = {
+    [K in T]: UnaryFn<K, R>;
+};
+
+type PatternReturns<
+    P extends Record<string | number, UnaryFn<never, unknown>>,
+> = ReturnType<ValueOf<P>>;
+
+export const getPrimitiveUnionMatcherW: <T extends string | number>() => <
+    P extends PatternPrimitiveUnion<unknown, T>,
+>(
+    pattern: Simplify<P>,
+) => UnaryFn<T, PatternReturns<P>> = () => (pattern) => (shape) =>
+    // Rewrite not to use any is possible, was evaluated and solutions were
+    // more complex than the current solution.
+
+    // oxlint-disable-next-line typescript/no-explicit-any typescript/no-unsafe-type-assertion
+    (pattern[shape] as any)(shape);
+
+// ============================================================================
+// ✔️ Exhaustive
+// ✔️ ReturnsStrict
+// ============================================================================
+export const getPrimitiveUnionMatcher: <T extends string | number>() => <R>(
+    pattern: Simplify<PatternPrimitiveUnion<R, T>>,
+) => UnaryFn<T, R> = getPrimitiveUnionMatcherW;
+
+// ============================================================================
+// ❌ Exhaustive
+// ✔️ ReturnsStrict
+// ============================================================================
+type PatternPrimitiveUnionPartial<R, T extends string | number> =
+    | PatternPrimitiveUnion<R, T>
+    | (Partial<PatternPrimitiveUnion<R, T>> & {
+          _: UnaryFn<T, R>;
+      });
+
+export const getPrimitiveUnionMatcherPartial: <T extends string | number>() => <
+    R,
+>(
+    pattern: Simplify<PatternPrimitiveUnionPartial<R, T>>,
+) => UnaryFn<T, R> = () => (pattern) => (shape) =>
+    // Rewrite not to use any is possible, was evaluated and solutions were
+    // more complex than the current solution.
+
+    // oxlint-disable-next-line typescript/no-explicit-any typescript/no-unsafe-type-assertion
+    (pattern[shape] ?? (pattern as any)["_"])(shape);
+
+// ============================================================================
+// ❌ Exhaustive
+// ❌ ReturnsStrict
+// ============================================================================
+export const getPrimitiveUnionMatcherPartialW: <
+    T extends string | number,
+>() => <P extends PatternPrimitiveUnionPartial<unknown, T>>(
+    // `Simplify<P>` is the inference hook: callers infer `P` from the argument.
+    // the second half pins the impl parameter's `R` to `PatternReturns<P>`.
+    // that makes the `= getPrimitiveUnionMatcherPartial` assignment type-check.
+    // neither half works alone.
+    // without the witness the union's `_` arm demands `_ ∈ keyof P`.
+    // without `Simplify<P>` the parameter types do not compare.
+    pattern: Simplify<P> & PatternPrimitiveUnionPartial<PatternReturns<P>, T>,
+) => UnaryFn<T, PatternReturns<P>> = getPrimitiveUnionMatcherPartial;