Using the release-2.1 branch, with target: "es6", this code:
const init = {a: 10, b: true};
let newObj = {...init, c: null};Generates the below emit, which contains the unnecessary helper __assign, as Object.assign is part of ES6 (see http://www.ecma-international.org/ecma-262/6.0/#sec-object.assign ).
var __assign = (this && this.__assign) || Object.assign || function(t) {
for (var s, i = 1, n = arguments.length; i < n; i++) {
s = arguments[i];
for (var p in s) if (Object.prototype.hasOwnProperty.call(s, p))
t[p] = s[p];
}
return t;
};
const init = { a: 10, b: true };
let newObj = __assign({}, init, { c: null });
Using the
release-2.1branch, withtarget: "es6", this code:Generates the below emit, which contains the unnecessary helper
__assign, asObject.assignis part of ES6 (see http://www.ecma-international.org/ecma-262/6.0/#sec-object.assign ).