TypeScript Talk Examples

parade.d.ts

interface IParadeParticipant {
    position: number
}

interface IParadeFloat extends IParadeParticipant {
    sponsor: string
    performers: string[]    
}

interface IParadeBaloon extends IParadeParticipant {
    character: string
    numberOfHandlers: number
    animated: boolean
}

interface IParadeMarchingBand extends IParadeParticipant {
    performers: Performer[]
}

type ParadeElement = IParadeFloat | IParadeBaloon | IParadeMarchingBand

interface IParade = {
    participants: ParadeElement[]
}

type ParadePerformers = Extract<ParadeElement, any[]>

Parade.ts

import { IParade, ParadeElement } from "./parade.d"

class Parade implements IParade {
  participants: ParadeElement[] = [];

  public addParticipant(participant: ParadeElement) {
    participant.position = this.participants.length;
    this.participants.push(participant);
  }
}

export default Parade;