How to customize properties in TypeScript

Question

How do I get TypeScript to emit property definitions such as:

Object.defineProperties(this, {
    view: {
        value: view,
        enumerable: false,
                


        

Answer 1

I was looking for exactly the same thing when I stumbled upon TypeScript Handbook: Decorators. In "Method Decorators" paragraph they define @enumerable decorator factory, which looks like this (I'm simply copy-pasting from there):

function enumerable(value: boolean) {
    return function (target: any, propertyKey: string, descriptor: PropertyDescriptor) {
        descriptor.enumerable = value;
    };
}

and they use it like this:

class Greeter {
    greeting: string;
    constructor(message: string) {
        this.greeting = message;
    }

    @enumerable(false)
    greet() {
        return "Hello, " + this.greeting;
    }
}

So another way of addressing it, is through usage of decorators.

PS: This feature requires experimentalDecorators flag to be passed to tscor set in tsconfig.json.