isBoolean

Problem

You need a type guard for boolean values — for example discriminating between boolean flags and other primitives in a generic input.

Solution

Use isBoolean(value) to narrow the type to boolean.

import { isBoolean } from '@vielzeug/arsenal';

isBoolean(true); // true
isBoolean(false); // true
isBoolean(1); // false
isBoolean('true'); // false

Related

• isPrimitive
• isDefined