Angular ：意外的令牌。 需要构造函数、方法、访问器或属性

Question

when I try to run my code when I declare a property with var or let keywords I get an error,

this goes fine:

export class productComponent {

    productId: any;

    constructor(){
    }

And this show the error:

export class productComponent {

    var productId: any;

    constructor(){
    }

doesn't typescript and javascript uses var and let to declare variables and angular is based on typescript. I know that someone will say productId is a field and not a variable , but isn't a field a variable ? what are the differences between field and variable in this case ?

Answer 1

When you declare a class in TypeScript for example:

 class Program{ public nombre: string; getNombre(){ return this.nombre; } setNombre(nombre:string){ this.nombre = nombre; } }

That's the correct syntax, it's incorrect to use the var/let/const keyword to declare a property inside a class or an object.