Object being recognized as null or undefined

Question

I'm trying to assign housePrototype as the prototype of House object, and followed up with this error

Object.assign(House.prototype, this.housePrototype); ^ TypeError: Cannot convert undefined or null to object

What am I doing wrong?

const House = {
    name: 'houseObject',
     readLocation: (location)=>{
      console.log(`house is located at ${location}`)
    }
  }

  const housePrototype = {
    readLocation: (location) => {
    console.log(`house prototype is located at ${location}`)
    }
  }

  Object.assign(House.prototype, housePrototype)
  
  House.readLocation('Malabe');
  console.log(House);

Answer 1

All credit goes to @JaromandaX. He explained the issue in the comments of the question.

Even though functions are Objects in JavaScript they are NOT identical. To access the prototype of a function function() {}.prototype can be used. But in the question, it is trying to access the prototype of a regular object, not a function object, which is undefined, thus the error.

Object.assign(House.__proto__, housePrototype); 

With this it is possible to assign desired object to the prototype (It is not recommended to assign any variables to proto and it si not at all a common pra)

The solution code would be

const House = {
    name: 'houseObject',
     readLocation: (location)=>{
      console.log(`house is located at ${location}`)
    }
  }

  const housePrototype = {
    readLocation: (location) => {
    console.log(`house prototype is located at ${location}`)
    }
  }

  Object.assign(House.__proto__, housePrototype)
  
  House.readLocation('Malabe');

I found a complete description in following StackOverflow thread __proto__ VS. prototype in JavaScript