Support for object literal property value shorthand

[maryo]

Started here: https://typescript.codeplex.com/workitem/1367

Please consider adding support for object literal property value shorthand, as per the ES6 proposal: http://wiki.ecmascript.org/doku.php?id=harmony:object_literals#object_literal_property_value_shorthand. This would allow for the following:

function foo(a: number) {
  var b = 123;
  return { a, b };  // instead of { a: a, b: b };
}

[basarat]

👍

[danquirk]

If ES6 is doing this then we'll certainly align with that. If it doesn't make it into ES6 then we'd almost assuredly have to wait for a future ES version lest we create incompatible syntax.

[mpawelski]

👍

With this feature this code:

var bigObject = {
    A: "1",
    B: "2",
    C: "3"
};

var smallObject = {
    A: bigObject.A,
    C: bigObject.C
}

could be written like this:

var bigObject = {
    A: "1",
    B: "2",
    C: "3"
};

var smallObject = {
    bigObject.A,
    bigObject.C
}

In my codebase this feature would very useful, because I'm often creating "smaller" object from "bigger" one, so for loop on "smaller" object enumerates just the properties I need.

[mhegazy]

@mpawelski I do not think this is what is proposed for ES6. the ES6 proposal is just for identifier names and not for dotted names.

[Arnavion]

Fixed by #1127 and #1346

[basarat]

In my codebase this feature would very useful, because I'm often creating "smaller" object from "bigger" one, so for loop on "smaller" object enumerates just the properties I need.

You can use destructuring with object literal property value:

var bigObject = {
    A: "1",
    B: "2",
    C: "3"
};

var {A,B} = bigObject,
    smallObject = {A,B};

🚨 untested code