Node.js

13.5    Interfaces

TypeScript interfaces are structures that don’t have method implementations and can’t be instantiated. However, like classes, they represent separate types you can use for variables and function signatures. Listing 13.25 shows an example of using such an interface.

class Movie {  constructor(    public id: number,     public title: string,     public year: number  ) {}} interface WithTitle {  title: string;} function show(movie: WithTitle) {  console.log('Now showing: ', movie.title);} const infinityWar = new Movie(3, 'Avengers: Infinity War', 2018); show(infinityWar); // Output: Now showing: Avengers: Infinity War 

Listing 13.25     Inline Interfaces with TypeScript

As you can see here, you can use the interface at any point where you ...