Return an object literal

Sometimes you need a function that just returns a simple object literal. However, something like

var foo = () => {
    bar: 123
};

is a parsed as a block containing a JavaScript Label by JavaScript runtimes (cause of the JavaScript specification). If that doesn't make sense, don't worry, as you get a nice compiler error from TypeScript saying "unused label" anyways. You can fix it by surrounding the object literal with ():

var foo = () => ({
    bar: 123
});