Adds 'Awaited' type alias and updates to Promise.all/race/allSettled/any #45350
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@typescript-bot perf test |
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Heya @rbuckton, I've started to run the perf test suite on this PR at 46ce88c. You can monitor the build here. Update: The results are in! |
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The user suite test run you requested has finished and failed. I've opened a PR with the baseline diff from master. |
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Interesting outcomes from the rwc tests:
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@rbuckton Here they are:Comparison Report - main..45350
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The OOM in Prettier doesn't seem to be related to this change, as I'm seeing it in other unrelated PRs as well. |
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Notes from design meeting:
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I investigated whether having |
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andrewbranch
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Sep 9, 2021
ExE-Boss
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| T : // argument was not an object | ||
| T; // non-thenable |
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I believe that these comments are swapped.
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Apparently so. I will push up a small fix.
I did a quick search for To check usages of |
This was referenced Nov 3, 2021
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Hello everyone, Not sure if this is the correct place to bring this up but the For reference, here is what /**
* Recursively unwraps the "awaited type" of a type. Non-promise "thenables" should resolve to `never`. This emulates the behavior of `await`.
*/
type Awaited<T> =
T extends null | undefined ? T : // special case for `null | undefined` when not in `--strictNullChecks` mode
T extends object & { then(onfulfilled: infer F): any } ? // `await` only unwraps object types with a callable `then`. Non-object types are not unwrapped
F extends ((value: infer V) => any) ? // if the argument to `then` is callable, extracts the argument
Awaited<V> : // recursively unwrap the value
never : // the argument to `then` was not callable
T; // non-object or non-thenableThe problem is that we have a custom Promise class ( Our public then<TResult1 = T, TResult2 = never>(
onfulfilled?: ((value: T, abortController: AbortController) => TResult1 | PromiseLike<TResult1>) | undefined | null,
onrejected?: ((reason: any) => TResult2 | PromiseLike<TResult2>) | undefined | null
): AbortablePromise<TResult1 | TResult2>;So Hence, Would it be possible to make the type condition more flexible in |
This was referenced Mar 18, 2022
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It would be helpful to add some documentation about this on the Utility types page, not just in the 4.5 release notes that aren't part of the docs search. |
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This adds an
Awaited<T>type alias that supports the following capabilities:PromiseLike(to avoid issues with augmentation/assignability)nevernullandundefinedin non-strictNullChecks modeThis also adds overloads to
Promise.all,Promise.race,Promise.allSettled, andPromise.anyto leverageAwaited<T>.Supersedes #33707, thanks @jablko for your prior work on this.
Fixes #27711
Fixes #22469
Fixes #28427
Fixes #30390
Fixes #31722
Fixes #33559
Fixes #33562
Fixes #33752
Fixes #34924
Fixes #34937
Fixes #35136
Fixes #35258