payload-is/lib/types/boolean.d.ts

A comprehensive TypeScript/JavaScript type checking library providing functions to check data types, collections, primitives, and built-in objects

export declare function isBoolean(payload: unknown): payload is boolean;
export declare function isTrue(payload: unknown): payload is true;
export declare function isFalse(payload: unknown): payload is false;
export declare function isBooleanObject(payload: unknown): payload is Boolean;