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ts-refinement

v0.2.0

Published

JavaScript-predicate refinement types for TypeScript

Downloads

369

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Links

Maintainers

trvswgnrtrvswgnr

Keywords

refinement-typestypescriptvalidation

Readme

ts-refinement

The type-level API for JavaScript-predicate refinement types in TypeScript.

npm install ts-refinement
import type { Refined } from "ts-refinement";

type Positive = Refined<number, "n > 0">;

ts-refinement is declaration-only: it has no runtime entry point or dependencies. Bare TypeScript carries its brands but cannot prove predicate implication.

Use tspc with @ts-refinement/typescript-plugin for TypeScript 5.7 through 6.x checking, or ttsc with @ts-refinement/ttsc for TypeScript 7 and newer. @ts-refinement/cli provides publish verification, and a supported @ts-refinement/unplugin adapter inserts runtime checks for unknown assertion sites on the legacy compiler path.

See the repository README for setup, behavior, and predicate rules.