JavaScript Duck typing vs. Interfaces

javascript-duck-typing.js

// Factory
var encrypterFactory = function(config) {
    var encrypter = eval('new Encrypt' + config.algorithm.toUpperCase());
    if (typeof encrypter.encrypt !== 'function') {
        throw new Error(encrypter.constructor.name + ' must implement the `encrypt` method!');
    }
    return encrypter;
};

// Implementations
class EncryptMD5 {
    encrypt(str) { return str.toUpperCase(); }
}
class EncryptROT13 {
    // offending: not implementing encrypt() method
}

// Consumer
var str = "imma be encrypted";
encrypterFactory({ algorithm: 'md5'   }).encrypt(str);  // => Success!
encrypterFactory({ algorithm: 'rot13' }).encrypt(str);  // => TypeError: .encrypt is not a function

javascript-interfaces.js

// Factory
var encrypterFactory = function(config) {
    var encrypter = eval('new Encrypt' + config.algorithm.toUpperCase());
    if (!(encrypter instanceof Encrypt)) {
        throw new Error(encrypter.constructor.name + ' must implement `Encrypt` interface!');
    }
    return encrypter;
};

// Interface
class Encrypt {
    encrypt(str) { throw new TypeError(this.constructor.name + ' must implement the `encrypt` method!'); }
}

// Implementations
class EncryptMD5 extends Encrypt {
    encrypt(str) { return str.toUpperCase(); }
}
class EncryptROT13 { // offending: not implementing interface
    encrypt(str) { return str.split('').reverse().join(''); }
}
class EncryptSHA256 extends Encrypt {
    // offending: not implementing encrypt() method
}

// Consumer
encrypterFactory({ algorithm: 'md5'    }).encrypt("encrypt me");  // => Success!
encrypterFactory({ algorithm: 'rot13'  }).encrypt("encrypt me");  // => Error: Implement Encrypt interface!
encrypterFactory({ algorithm: 'sha256' }).encrypt("encrypt me");  // => Error: Implement encrypt() function!

Hello, can the check also be done on type of arguments to the functions/methods? So in case we want to input a new class as a parameter for encrypt function, how can we check that it's the type of that function?