Abstract getter/setter

[dungdm93]

TypeScript Version: 2.0.3

Code

abstract class Abstract {
    abstract set foo(value: string);
    abstract get bar(): string;
    abstract biz: number;
}

class Concrete extends Abstract {
    biz: number;
    constructor(public foo: string, public bar: string) {
        super();
        this.biz = 20;
    }

    toString(): string {
        return `${this.foo} ${this.bar}`;
    }
}

let i: Abstract = new Concrete("Hello", "World");
console.log(i.toString()); // undefined undefined

Expected behavior:
print Hello world

Actual behavior:
print undefined undefined

So look at Abstract class in JavaScript. foo & bar implementations are generated even they declared as abstract.

var Abstract = (function () {
    function Abstract() {
    }
    Object.defineProperty(Abstract.prototype, "foo", {
        set: function (value) { },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(Abstract.prototype, "bar", {
        get: function () { },
        enumerable: true,
        configurable: true
    });
    return Abstract;
}());

[dungdm93]

#11596

[rbuckton]

@dungdm93: This has already been addressed in master with our new emitter. You should be able to test these changes using our nightly builds. If you are using NodeJS, you can install the latest nightly build via npm install typescript@next.

[dungdm93]

@rbuckton thanks. :)