ae7ffb6fa26898276c0a3129500a2e23bd5cb1ed
Rewrite development/library.md around the new shape: the fallback is a second argument (so it can receive the remainder), `R` needs an inference site in the handler map, `Exact` restores the excess-property check, and the overload order is load-bearing. Record this branch's rejected alternatives (single-object `_`, currying, `this`/HKT, variance/`const`/`NoInfer`/brands) and the redundant- fallback known issue. Add the changelog note and check off the backlog task.
tiny-pattern-ts
Pattern matching for TypeScript/ESM environments (F#-style, not regex).
Description
tiny-pattern-ts brings F#-style pattern matching to TypeScript. Patterns are
ordinary objects whose matches method is a TypeScript type guard, so narrowing
composes the way any other guard does. It is deliberately not a regex engine and
not a macro: there is no transpiler and no DSL to learn, and the type-level
contract is the feature — see development/library.md
for the design decisions and the known limitations.
Requirements
- Node.js >= 26 (
enginesfield; pinned via.node-version). - TypeScript >= 5.0 to consume the published declarations. The emitted
.d.tsuseconsttype parameters (TS 5.0) and keep their relative.tsspecifiers; both resolve on TS >= 5.0 innode10/node16/nodenext/bundler. - The package is ESM-only (no CommonJS shim).
API
Yet to be implemented
License
MIT © 2025 tmu. See LICENSE.
Contributing
Contributions are documented in CONTRIBUTING.md; the reasons behind the project's decisions, rejected alternatives, and known issues live in development/. AI coding agents start at AGENTS.md.