Ternary with computed property object emits invalid JS

[blacktaxi]

TypeScript Version: 2.1.1

Code

const x = true ? { ['test']: 5 } : {};

Expected behavior:
TS 2.0.6 emits this JS:

var x = true ? (_a = {}, _a['test'] = 5, _a) : {};
var _a;

Actual behavior:
TS 2.1.1 emits this JS:

var x = true ? _a = {}, _a['test'] = 5, _a : {};
var _a;

The problem with it is that it's not a valid JS syntactically. Here's the output from node 5.9.0 from attempt at running it:

[stdin]:1
var x = true ? _a = {}, _a['test'] = 5, _a : {};
                      ^

SyntaxError: Unexpected token ,
    at Object.exports.runInThisContext (vm.js:53:16)
    at Object.<anonymous> ([stdin]-wrapper:6:22)
    at Module._compile (module.js:413:34)
    at node.js:550:27
    at _combinedTickCallback (node.js:376:9)
    at process._tickCallback (node.js:407:11)

[mhegazy]

Looks fixed in latest. can you give typescript@next a try.

c:\test>type a.ts
const x = true ? { ['test']: 5 } : {};

c:\test>tsc --v
Version 2.2.0-dev.20161130

c:\test>tsc a.ts

c:\test>type a.js
var x = true ? (_a = {}, _a['test'] = 5, _a) : {};
var _a;

[vladima]

duplicate of #12413