Return statements followed by an operand or a bracket get transpiled into invalid JavaScript

[JochCool]

When you transpile code that contains a return statement that returns an object (such as {a: a, b: b}), the result is invalid JavaScript. When running it, you get: SyntaxError: Unexpected token ':' (referring to the second colon).

How to reproduce

1. Transpile the following code:

var a = 1, b = 2;
function test() {
	return { a: a, b: b };
};
console.log(test());

2. Run the original code. The output is { a: 1, b: 2 }.
3. Run the transpiled code. There is a syntax error.

[JochCool]

I think I found the cause: it's the return statement. JavaScript is probably trying to put a semicolon behind it because it can, and therefore the rest becomes a syntax error. If you move the curly bracket in the transpiled code to just behind the return statement, it works.