خطای Object literal may only specify known properties در تایپ اسکریپت

interface Point {
  x: number;
  y?: number;
}
function computeDistance(point: Point) { /*...*/ }

computeDistance({ x: 1, y: 2, z: 3 });
//   Object literal may only specify known properties, and 'z' does not exist in type 'Point'.(2345)

const obj = { x: 1, z: 3 };
computeDistance(obj); // OK

interface Person {
  first: string;
  middle?: string;
  last: string;
}
function computeFullName(person: Person) { /*...*/ }

computeFullName({first: 'Jane', mdidle: 'Cecily', last: 'Doe'});
// @ts-ignore: Argument of type '{ first: string; mdidle: string; last: string; }' is not assignable to parameter of type 'Person'.
//   Object literal may only specify known properties, but 'mdidle' does not exist in type 'Person'. Did you mean to write 'middle'?

const obj = { x: 1, y: 2, z: 3 };
computeDistance1(obj);

computeDistance1({ x: 1, y: 2, z: 3 } as Point); // OK

function computeDistance2<P extends Point>(point: P) { /*...*/ }
computeDistance2({ x: 1, y: 2, z: 3 }); // OK

interface Person {
  first: string;
  middle?: string;
  last: string;
  // Index signature
  [propName: string]: any;
}

interface Incrementor {
  inc(): void
}
 
function createIncrementor(start = 0): Incrementor {
  return {
    // @ts-ignore: Type '{ counter: number; inc(): void; }' is not assignable to type 'Incrementor'.
    //   Object literal may only specify known properties, and 'counter' does not exist in type 'Incrementor'.(2322)
    counter: start,
    inc() {
      // @ts-ignore: Property 'counter' does not exist on type 'Incrementor'.(2339)
      this.counter++;
    },
  };
}

function createIncrementor2(start = 0): Incrementor {
  return {
    counter: start,
    inc() {
      // @ts-ignore: Property 'counter' does not exist on type 'Incrementor'.(2339)
      this.counter++;
    },
  } as Incrementor;
}

function createIncrementor3(start = 0): Incrementor {
  const incrementor = {
    counter: start,
    inc() {
      this.counter++;
    },
  };
  return incrementor;
}

interface Incrementor {
  inc(): void;
  [propName: string]: any;
}