typescript interface function
interface IEmployee {
    empCode: number;
    empName: string;
    getSalary: (number) => number; // arrow function
    getManagerName(number): string; 
}
                                
                            typescript interface function
interface IEmployee {
    empCode: number;
    empName: string;
    getSalary: (number) => number; // arrow function
    getManagerName(number): string; 
}
                                
                            typescript class interface
interface IPerson {
  name: string
  age: number
  hobby?: string[]
}
class Person implements IPerson {
  name: string
  age: number
  hobby?: string[]
  constructor(name: string, age: number, hobby: string[]) {
    this.name = name
    this.age = age
    this.hobby = hobby
  }
}
const output = new Person('john doe', 23, ['swimming', 'traveling', 'badminton'])
console.log(output)
                                
                            typescript interface
// https://stackoverflow.com/a/41967120
// `I` Prefix not recommended : 
// Ref : https://stackoverflow.com/a/41967120, 
//       https://github.com/Microsoft/TypeScript/wiki/Coding-guidelines
interface SquareConfig {
  color?: string;
  width?: number;
  [propName: string]: any;
}
interface StringArray {
  [index: number]: string;
}
 
let myArray: StringArray;
myArray = ["Bob", "Fred"];
 
let myStr: string = myArray[0];
                                
                            typescript type interface
//INTERFACE	                                TYPE
interface Animal {	                        type Animal = {
    name: string;	                            name: string;
}	                                        }
interface Bear extends Animal {	            type Bear = Animal & { 
    honey: boolean;	                            honey: Boolean;
}	                                        }
const bear = getBear();	                    const bear = getBear();
bear.name;	                                bear.name;
bear.honey;	                                bear.honey;
                                
                            typescript interface
interface LabeledValue {
  label: string;
}
function printLabel(labeledObj: LabeledValue) {
  console.log(labeledObj.label);
}
let myObj = { size: 10, label: "Size 10 Object" };
printLabel(myObj);Try
                                
                            create method in interface for set TS
running: someTask, arg: test
                                
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