Fix: checkAliasSymbol crash when checking for @deprecated #42971
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It's possible that we shouldn't be creating symbol with no declarations from non-homomorphic mapped types, but for 4.2, the right fix is to make the @deprecated-check in checkAliasSymbol ensure that target.declarations is defined.
typescript-bot
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For Milestone Bug
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@RyanCavanaugh @DanielRosenwasser you are probably interested in this too. |
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We've been creating symbols this way since at least 3.0. The right thing to do is to put |
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| error(node, Diagnostics.Re_exporting_a_type_when_the_isolatedModules_flag_is_provided_requires_using_export_type); | |||
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| if (isImportSpecifier(node) && every(target.declarations, d => !!(getCombinedNodeFlags(d) & NodeFlags.Deprecated))) { | |||
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Our every helper doesn't handle undefined? Most of our other array helpers treat undefined as an empty array input. Maybe we should change the helper?
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It does handle undefined, but every(undefined, _) ==> true, and then addDeprecatedSuggestion crashes on the next line.
This fix is shorter than target.declarations && every(target.declarations, ... and uses the standard utility, so I think it's better.
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@typescript-bot cherry-pick this to 4.2 |
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Heya @sandersn, I couldn't find the branch '4.2' on Microsoft/TypeScript. You may need to make it and try again. |
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@typescript-bot cherry-pick this to release-4.2 |
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Component commits: 9f9825a Fix: checkAliasSymbol crash when checking for @deprecated It's possible that we shouldn't be creating symbol with no declarations from non-homomorphic mapped types, but for 4.2, the right fix is to make the @deprecated-check in checkAliasSymbol ensure that target.declarations is defined. 75449de Add bug number and accept baselines
Component commits: 9f9825a Fix: checkAliasSymbol crash when checking for @deprecated It's possible that we shouldn't be creating symbol with no declarations from non-homomorphic mapped types, but for 4.2, the right fix is to make the @deprecated-check in checkAliasSymbol ensure that target.declarations is defined. 75449de Add bug number and accept baselines Co-authored-by: Nathan Shively-Sanders <nathansa@microsoft.com>
It's possible that we shouldn't be creating symbol with no declarations from non-homomorphic mapped types, but for 4.2, the right fix is to make the @deprecated-check in checkAliasSymbol ensure that target.declarations is defined.
Fixes #42957, test case based on
@types/http-errors