Re: [v8-google3] Re: Question - Is it possible as the embedder of V8 engine to call an async function directly and await the result?

[Andreas Haas]

+v8-users 

On Tue, Jan 12, 2021 at 2:23 PM Andreas Haas <ah...@google.com> wrote:

Hi All,

We were able to minimize the issue further. The problem is that the result of the script is a promise. Already the script

new Promise((res, rej) => {});

hangs (thanks Camillo). The problem could be a missing MicroTasksScope, but we still have to verify that.

Cheers, Andreas

On Tue, Jan 12, 2021 at 8:25 AM Marja Hölttä <ma...@google.com> wrote:

Hi,

Top-level await only works for modules; assuming your scripts are not modules, so that's not applicable for you.

Didn't ahaas@ implement an API for checking whether there's a pending task, so that you could spin the event loop while there's one?

On Mon, Jan 11, 2021 at 5:30 PM Maitri Shastri <maitri...@google.com> wrote:

+V8 Google3 

On Mon, Jan 11, 2021 at 9:59 PM Maitri Shastri <maitri...@google.com> wrote:

Hi All,

Apps Script (script.google.com) uses Chrome V8 execution engine. Recently we encountered a bug (http://b/176740430) where the user called an async function directly and the script timed out. Is it possible as the embedder to call an async function and await the result?

Executed it in chrome browser - and the linked snippet didnt time out there. +Andreas Haas pointed me to a public documentation.

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[Ben Noordhuis]

On Tue, Jan 12, 2021 at 2:25 PM 'Andreas Haas' via v8-users
<v8-u...@googlegroups.com> wrote:
>
> +v8-users
>
> On Tue, Jan 12, 2021 at 2:23 PM Andreas Haas <ah...@google.com> wrote:
>>
>> Hi All,
>>
>> We were able to minimize the issue further. The problem is that the result of the script is a promise. Already the script
>>
>> new Promise((res, rej) => {});
>>
>> hangs (thanks Camillo). The problem could be a missing MicroTasksScope, but we still have to verify that.
>>
>> Cheers, Andreas
>>
>>
>> On Tue, Jan 12, 2021 at 8:25 AM Marja Hölttä <ma...@google.com> wrote:
>>>
>>> Hi,
>>>
>>> Top-level await only works for modules; assuming your scripts are not modules, so that's not applicable for you.
>>>
>>> Didn't ahaas@ implement an API for checking whether there's a pending task, so that you could spin the event loop while there's one?
>>>
>>>
>>> On Mon, Jan 11, 2021 at 5:30 PM Maitri Shastri <maitri...@google.com> wrote:
>>>>
>>>> +V8 Google3
>>>>
>>>> On Mon, Jan 11, 2021 at 9:59 PM Maitri Shastri <maitri...@google.com> wrote:
>>>>>
>>>>> Hi All,
>>>>> Apps Script (script.google.com) uses Chrome V8 execution engine. Recently we encountered a bug (http://b/176740430) where the user called an async function directly and the script timed out. Is it possible as the embedder to call an async function and await the result?
>>>>> Executed it in chrome browser - and the linked snippet didnt time out there. +Andreas Haas pointed me to a public documentation.

new Promise((res, rej) => {}) won't ever resolve. It's not that you
can't await it (there are several ways of doing that) but it's never
going to complete.