export function assertInstanceOf<T extends { new (...args: unknown[]): InstanceType<T> }>( value: unknown, type: T ): InstanceType<T> { if (!(value instanceof type)) { throw new Error(`Expected value to be an instanceof ${typeof type} but got ${typeof value}`); } return value; } export function assertIsDefined<T>(value: T | null | undefined): T { if (value == null) { throw new Error(`Expected value to not be null but got ${typeof value}`); } return value; }