ts extend interface code example

Example 1: typescript interface function

interface IEmployee {
    empCode: number;
    empName: string;
    getSalary: (number) => number; // arrow function
    getManagerName(number): string; 
}

Example 2: typescript extend interface

//declare interface to be extended
interface Vehicle {
  brand: string;
  plateNumber: number;
}

interface Car extends Vehicle {}

Example 3: typescript interface

interface NumberOrStringDictionary {
  [index: string]: number | string;
  length: number; // ok, length is a number
  name: string; // ok, name is a string
}Try

Example 4: create method in interface for set TS

running: someTask, arg: test