ES6 spread syntax does not properly compile when targeting ES3/ES5

[aaronlahey]

TypeScript Version: 2.1.0-dev.20161102

Code

Source

export class Foo {
  public foo(...strings: string[]): this {
    return this;
  }
}

const instance = new Foo();

instance
  .foo(...[])
  .foo(...[])

Compiled Code

"use strict";
var Foo = (function () {
    function Foo() {
    }
    Foo.prototype.foo = function () {
        var strings = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            strings[_i - 0] = arguments[_i];
        }
        return this;
    };
    return Foo;
}());
exports.Foo = Foo;
var instance = new Foo();
(_a = instance
    .foo(...[])).foo.apply(_a, []);
var _a;

Expected behavior:

The compiled code should not contain ....

Actual behavior:

(_a = instance
    .foo(...[])).foo.apply(_a, []);