1961778 - Misleading SyntaxError When Using Top-Level Await inside Parameter List in Addon Content Script

Status: NEW

(Core :: JavaScript Engine, enhancement, P3)

Description

[Gavin Morrow]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Steps to reproduce:

In an addon content script, try to call an async function with await at the top level. It must be inside some sort of parenthesis, e.g. a parameter list.

Actual results:

both of these cause an error that does not mention await. It seems to be the standard error for if any two identifiers are in a row without anything between them.

console.log(await fetch("https://example.com")); // SyntaxError: missing ) after argument list
(await fetch("https://example.com")); // SyntaxError: missing ) in parenthetical

Expected results:

The normal error for if it's outside of parenthesis:

await fetch(); // SyntaxError: await is only valid in async functions, async generators and modules

Comment 1

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'WebExtensions::Untriaged' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.