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Allow of in await using declarations in for-of loops #55558

Merged
merged 3 commits into from
Oct 31, 2023
Merged

Allow of in await using declarations in for-of loops #55558

merged 3 commits into from
Oct 31, 2023

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Andarist
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fixes #55555

@typescript-bot typescript-bot added the For Uncommitted Bug PR for untriaged, rejected, closed or missing bug label Aug 29, 2023
@Andarist Andarist force-pushed the fix/allow-of-in-await-using-in-for-of branch from 7a75c09 to 7f15218 Compare August 29, 2023 08:23
@typescript-bot typescript-bot added For Milestone Bug PRs that fix a bug with a specific milestone and removed For Uncommitted Bug PR for untriaged, rejected, closed or missing bug labels Aug 29, 2023
rbuckton
rbuckton requested changes Oct 30, 2023
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tests/baselines/reference/awaitUsingDeclarationsInForAwaitOf.2.errors.txt Outdated
Comment on lines 9 to 11
for await (await using of of of) {};
~~~~~
!!! error TS1431: 'for await' loops are only allowed at the top level of a file when that file is a module, but this file has no imports or exports. Consider adding an empty 'export {}' to make this file a module.
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Can we put this in an async context, like an async function so that we don't have this spurious error in errors.txt?

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I just pushed out the requested change. Could you take another look at this?

@rbuckton rbuckton merged commit 3e12250 into microsoft:main Oct 31, 2023
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@jakebailey
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Note that 5.3 is cut; not sure if you intended for this to be in 5.3 or not.

@rbuckton
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rbuckton commented Nov 2, 2023

I did. This was a bugfix for a grammar error.

@rbuckton rbuckton changed the title Allow of in await using declarations in for-of loops Allow of in await using declarations in for-of loops Nov 2, 2023
@jakebailey
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It was synced in after I commented, so nevermind!

@evanw
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evanw commented Nov 18, 2023

With this change, for (await using of x) ; is an error but for await (await using of x) ; is now not an error (a change in behavior from TS 5.2). In addition, the emit for for await (await using of x) ; has an extra space in it which implies to me that TypeScript's internal AST contains an empty variable declaration list, which would be invalid. Babel treats both as a syntax error (see this and this), which also leads me to believe that this is a bug in TypeScript.

Was that an intentional aspect of this change or was that a regression?

@Andarist
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@evanw thanks for this information - I'll take a look at this soon.

@Andarist Andarist mentioned this pull request Nov 19, 2023
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@rbuckton rbuckton rbuckton approved these changes

@DanielRosenwasser DanielRosenwasser DanielRosenwasser approved these changes

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Parsing error for for (await using of of of) {}
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@Andarist @jakebailey @rbuckton @evanw @DanielRosenwasser @typescript-bot