Destructured parameter properties do not introduce properties into their respective class

[DanielRosenwasser]

class C {
    constructor(public [x, y, z]: string[]) {
    }
}

var c = new C([]);
c.x === c.y;

which gives us

error TS2339: Property 'x' does not exist on type 'C'
error TS2339: Property 'y' does not exist on type 'C'

The question is should we be adding properties when destructuring in the face of a visibility modifier?

[DanielRosenwasser]

@jonathandturner and I spoke offline and decided that the binding parameters should introduce properties of the appropriate visibility.

[DanielRosenwasser]

@ahejlsberg and I spoke offline and decided that binding parameters should not introduce properties of the appropriate visibility.

[mhegazy]

Reopening to update the spec.

[DanielRosenwasser]

This is Fixed as far as the work goes; the spec work needs to be done.

[danquirk]

Let's create new bugs for spec work, that way you can close this with the fixed label. Otherwise we should remove the fixed label from this one, which then makes confusing the fact that it does represent dev work that fixed an issue.

[DanielRosenwasser]

Agreed; I've opened up #1691 instead.