skewer-eval-defun doesn't recognize async javascript functions

[formido]

Evaluating the following:

async function test_await() {
  response = await fetch('./api');
  json = await response.json();
  console.log(json);
}

...gives:

SyntaxError: await is only valid in async function

SyntaxError: await is only valid in async function
    at Array.eval (<anonymous>)
[...]

Expression:

function test_await() {
  response = await fetch('./api');
  json = await response.json();
  console.log(json);
}

[ghost]

Same issue

[UwUnyaa]

Looks like an issue as to what skewer considers an expression.

This could be the culprit: https://github.com/skeeto/skewer-mode/blob/master/skewer-mode.el#L451

I might take a look at this later and try to tackle it, but it might require a bump to required version of js2-mode.

[UwUnyaa]

I haven't figured out a way to use js2-mode's API to check whether current function is async or not, or any other approach that could potentially work. It seems like code related to that is used while parsing, and can't be easily used to check whether point is at an async function. It's also worth noting that there's no node type for async token or anything like that. It might be worth asking the developer of js2-mode whether there's any way to do this for code using this mode's code.