remove_assertion.ts

type ClassType = new (...args: any[]) => any;

function merge(derived: ClassType, ...classRefs: ClassType[]) {
    classRefs.forEach(classRef => {
        Object.getOwnPropertyNames(classRef.prototype).forEach(name => {
            const descriptor = Object.getOwnPropertyDescriptor(classRef.prototype, name)
            // just add condition statement
            if (name !== 'constructor' && descriptor) {
                Object.defineProperty(
                    derived.prototype,
                    name,
                    descriptor
                );
            }
        });
    });

    return derived;
}