tmu
08384bbc82
Introduce the core builder and pattern constructors:
- match(value): chain .with(pattern, handler) and terminate with
.exhaustive() (throws on no match) or .otherwise(handler).
- P.literal, P.type, P.when, P.any, P.shape for pattern construction.
- Each pattern is a Matcher<T> whose matches acts as a type guard, so
handler parameters are narrowed to the matched type.
The MatchBuilder accumulates handlers and returns a new builder per
.with() call (immutable chaining); finalization runs the cases in order
and returns the first match's handler result.
TypeScript configuration relaxed in .oxlintrc.json:
- Disable eslint/no-undefined (we use undefined as the no-match sentinel)
- Disable eslint/sort-keys (handler order matters; alphabetical would
be wrong)
- Disable eslint/id-length (T/R/U/V generics are standard TS convention)
- Disable import/no-named-export (false positive for library entry points)
Verified:
- tsc --noEmit passes with strict + noUncheckedIndexedAccess
- tsc -p tsconfig.build.json emits dist/*.js + .d.ts + sourcemaps
- node -e "import('./dist/index.js')" loads and exposes { match, P }
tiny-pattern-ts
Pattern matching for TypeScript/ESM environments (F#-style, not regex).
Development
- Build:
npm run build - Test:
npm run test,npm run test:ci - Checks:
npm run check,npm run fix - Format/Fix:
npm run fix:oxfmt,npm run fix:oxlint
Tooling
- TypeScript 7 — type checker and build (
tsc). - node --test +
--experimental-strip-types— test runner (Node 22.6+, flag dropped on Node 24). - c8 — code coverage for
test:ci. - oxlint — Rust-based linter.
- oxfmt — Rust-based formatter (Prettier-compatible).
- cspell — spell checking.
- sort-package-json — keep
package.jsonkeys alphabetized. - lefthook — git pre-commit hooks.
Requirements
- Node.js >= 22.6 (>= 24 recommended;
--experimental-strip-typesis unflagged on 24).
VSCode integration
- Recommended extensions: see
.vscode/extensions.json(oxc, cspell). - TypeScript 7 is used via
typescript.tsdkpointing atnode_modules/typescript/lib. - oxc extension provides oxlint squiggles and oxfmt format-on-save.
Workflows
- Version updates via
npm version. - Publishing via GitHub Actions on tagged commits (see
.github/workflows/ci.yml). - Changesets is available as a devDependency for changelog automation if desired.
Contribution guidelines
- Commit signing (GPG).
- Set up commit message template:
npm run use:git-commit-message. - See
commit-message-template. - Type-only tests use
expect-type'sexpectTypeOf(...)insidenode --testcases.