Hi,
We followed spec text
<https://tc39.es/proposal-explicit-resource-management/#sec-getdisposemethod>
to implement the feature. According to that:
GetDisposeMethod
...
a. Let method be ? GetMethod(V, @@asyncDispose).
b. If method is *undefined*, then
i. Set method to ? GetMethod(V, @@dispose).
So when the [Symbol.asyncDispose] is defined, [Symbol.dispose] will not be
used. I am not sure why the description in the Github repository is not
consistent with the spec text.
Please let me know if you have any other questions!
Bests,
Rezvan
On Wed, Apr 23, 2025 at 10:04 AM Marja Hölttä <[email protected]> wrote:
> cc rezvan
>
> On Wed, Apr 23, 2025 at 5:44 PM ClearScript Developers <
> [email protected]> wrote:
>
>> Hello!
>>
>> Consider the following:
>>
>> async function foo() {
>> await using x = { [Symbol.asyncDispose]: 0, [Symbol.dispose]: () =>
>> {} };
>> }
>> await foo();
>>
>> This throws "TypeError: Symbol(Symbol.asyncDispose) is not a function".
>>
>> Is that a bug? According to our reading of the proposal
>> <https://github.com/tc39/proposal-explicit-resource-management>, the
>> synchronous fallback should be used if [Symbol.asyncDispose] exists but
>> isn't a function. From the proposal:
>>
>> let $$dispose = x[Symbol.asyncDispose];
>> if (typeof $$dispose !== "function") {
>> $$dispose = x[Symbol.dispose];
>> }
>>
>> Thanks!
>>
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>>
>
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