ts class

class Greeter {  
  greeting: string;
  
  constructor(message: string) {
    this.greeting = message;  
  }
  
  greet() {    
    return "Hello, " + this.greeting;
  }}

let greeter = new Greeter("world");Try

export class Ingredient{
  //This is a shortcut to what is written below 
  constructor(public name:String, public amount:String){}
}

// On top is the same as below 
//
// export class Ingredient{
//     public name: String;
//     public amount: Number;
    
//     constructor(name:String , amount:Number) {
//         this.name = name;
//         this.amount = amount;
//     }
// }