1.type

type MyObj = {
  a: string;
  b: number;
  c: () => number;
};

2.interface

interface MyObj {
  a: string;
  b: number;
  c: () => number;
}

3. class

class MyObj  {
  a:string;
  b:number;
  c:()=>number
}

 

// Error: Property 'staticProperty' does not exist on type 'M'.