IvsonEmidio

class clients {

  public function sendEmail (emailType: string){
    if (emailType === 'html'){
      let email = parseHtml(this.email);
    } else if (emailType === 'plainText'){
      let email = parsePlainText(this.email);
    } else if (emailType === 'numeric') {
      let email = parseNumeric(this.email);
    }

IvsonEmidio

import ICar from "./ICar";

class Diablo implements ICar {
  readonly brand = "Lamborghini";
  readonly color = "black";

  public getMarketPrice(): Promise<number> {
    return new Promise((resolve, reject) => {
      let result = 200;

IvsonEmidio

export default interface ICar {
  readonly brand: string;
  readonly color: string;

  getMarketPrice(): Promise<number>;
}

IvsonEmidio

//First generic class
class Diablo {
  private readonly brand = "Lamborghini";
  private readonly color = "black";
}

//Second generic class
class Soul {
  readonly brand = "Kia";
  readonly color = "Red";