How to store keys of a type argument in typescript without passing an instant?

Question

type TKeyed = { [key: string]: any };

class MyClass<T extends TKeyed> {
  private keysMap: Map<string, any>;

  constructor() {
    const keys = Object.keys({} as T); // Retrieve the keys of T
    this.keysMap = new Map<string, any>();

    for (const key of keys) {
      this.keysMap.set(key, null); // Store the keys in the Map
    }
  }

  getKeysMap(): Map<string, any> {
    return this.keysMap;
  }
}

interface MyType extends TKeyed {
  prop1: string;
  prop2: number;
}

const myInstance = new MyClass<MyType>();
const keysMap = myInstance.getKeysMap();

console.log(keysMap); // Output: Map { 'prop1' => null, 'prop2' => null }

This is what I'm trying to output: // Output: Map { 'prop1' => null, 'prop2' => null }

But, the result is: Map (0) {}

I've tried the above code using those methods to extract the keys: const keys = Reflect.ownKeys({} as T); It didn't work either.