Rewrite into try-expressions

[arthurfiorette]

Preview

[arthurfiorette]

Should I use undefined instead of null?

[Not-Jayden]

Exciting to see this proposal progressing 👍

[DavidJCobb]

I'm not especially familiar with the nuances of parsing JavaScript code, so this could be a non-issue, but I see a possible parsing ambiguity: is try { foo: 5 } the start of a try-catch block (containing a label and a no-op expression statement), or is it a try-expression where the expression being tried is an object literal?

How does the parser tell them apart? (Presence or absence of catch? What if a syntax error obscures the catch?) How long does the parser have to wait before it knows the answer?

You could explicitly require that try-expression be the right-hand side of an assignment, but that precludes things like

let foo = {
   a: try await bar(),
   b: try await baz()
};

[arthurfiorette]

@DavidJCobb 43bb6a2