smart-types-ts/src/string/string.ts

A collection of _Smart Types_ and _Smart Constructors_ which enable you to be more strict when defining your application's important types/interfaces.

import * as e from "fp-ts/lib/Either";

const isString = (val: unknown): val is string => typeof val === "string";

export const string = e.fromPredicate(isString, () => "Not a string");