IsBoolean.md

typelab / assertions / IsBoolean

type IsBoolean<T> = _IsTrue<IfBoolean<T, true, false>>;

Checks if a given type T is a boolean.

Type Parameters

Type Parameter	Description
T	The type to be checked.

Returns

true if T is a boolean, false otherwise.

Example

type Valid = IsBoolean<boolean>; // true
type Invalid = IsBoolean<string>; // false