stringOfLength

stringOfLength

Matcher for a string with exactly the expected length.

Matchers are applied through assertObjectMatches, where they narrow the corresponding property type.

Type information that already exists in the calling scope is incorporated.

Usage

import { assertObjectMatches, stringOfLength } from "@kensio/smartass";

const value: unknown = {
  id: "user_123",
};

assertObjectMatches(value, {
  id: stringOfLength(8),
});

// value is now narrowed to an object with an 8-character id
// {
//   id: string & { length: 8; 0: string; ...; 7: string };
// }

Source

Source file: src/assert/string-length/string-length.match.ts