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ts-tagged

v1.0.0

Published

Base generic type for weak nominal typing in Typescript

Downloads

76

Vulnerabilities

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  • 0Medium
  • 0Low

Links

Git

Maintainers

demurgosdemurgos

Keywords

typescripttaggednamednominal

Readme

ts-tagged

Defines the Tagged<T, N> generic type letting you created tagged types with base type T and name N. Two variables of a tagged type can only be assigned to each other if they have the same base type and name.

This implements a weak form of nominal typing suitable for types shared across multiple packages.

Installation

npm install -S ts-tagged

Example

import { Tagged } from "ts-tagged";

type Email = Tagged<string, "Email">;
type DisplayName = Tagged<string, "DisplayName">;

const email: Email = "[email protected]";
const displayName: DisplayName = "Foo Bar";

function sendEmail(recipient: Email) {
  // ...
}

sendEmail(email); // OK
sendEmail(displayName); // Compilation error: the names don't match
sendEmail("[email protected]"); // OK: Unnamed, but the base type matches
sendEmail(42); // Compilation error: The base type does not match

License

MIT License