tsickle should emit goog.reflect.objectProperty for property names passed to __rest tslib helper

[mitchellwills]

rest destructuring assignments are not safe for closure compiler because tsc/tsickle emits property names as quoted strings. It looks like it should be pretty simple to apply goog.reflect.objectProperty here

Example Input:

const input = {x: 1, y: 2, z: 3};
const {x, ...rest} = input;

Current Emit:

const input = { x: 1, y: 2, z: 3 };
const { x } = input, rest = __rest(input, ["x"]);

Proposed Emit:

const input = { x: 1, y: 2, z: 3 };
const { x } = input, rest = __rest(input, [goog.reflect.objectProperty("x", input)]);

Related: #241
This probably applies to other emit too

[evmar]

To hook this, I think we'd need to postprocess the JS output to look for calls to __rest (really tslib's rest).

[jplaisted]

Alternatively can tsickle just emit the same code? Why is it lowering the language level?

[brad4d]

Internal issue created http://b/171341422