@js-types-runtime/string

Lightweight string type checker. Zero dependencies.

Installation

npm install @js-types-runtime/string

Usage

import { string } from '@js-types-runtime/string';

string('hello'); // true
string(''); // true

string(42); // false
string(null); // false

API

string(value)

Checks if a value is a string.

• value: unknown
• returns: boolean

TypeScript

This package includes type definitions with a type predicate:

const string: (v: unknown) => v is string;

So you get type narrowing:

const x: unknown = 'hello';

if (string(x)) {
  x.toUpperCase(); // ✅ x is string
}

License

MIT