Always substitute indexed generic mapped type when getting constraint from indexed access #53066
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… from indexed access
typescript-bot
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For Milestone Bug
Andarist
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Mar 2, 2023
| @@ -13512,7 +13512,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker { | |||
| } | |||
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| function getConstraintFromIndexedAccess(type: IndexedAccessType) { | |||
| if (isMappedTypeGenericIndexedAccess(type)) { | |||
| if (isMappedTypeGenericIndexedAccess(type) || isGenericMappedType(type.objectType)) { | |||
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If the indexed access is allowed - then I think it's always safe to substitute as when the indexType is invalid then the error is reported elsewhere anyway.
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@typescript-bot test this |
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Heya @weswigham, I've started to run the extended test suite on this PR at 20c9d3a. You can monitor the build here. |
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Heya @weswigham, I've started to run the parallelized Definitely Typed test suite on this PR at 20c9d3a. You can monitor the build here. Update: The results are in! |
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Heya @weswigham, I've started to run the perf test suite on this PR at 20c9d3a. You can monitor the build here. Update: The results are in! |
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Heya @weswigham, I've started to run the diff-based top-repos suite on this PR at 20c9d3a. You can monitor the build here. Update: The results are in! |
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Hey @weswigham, the results of running the DT tests are ready. |
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@weswigham Here are the results of running the top-repos suite comparing Everything looks good! |
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@weswigham Here they are:
CompilerComparison Report - main..53066
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TSServerComparison Report - main..53066
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StartupComparison Report - main..53066
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Developer Information: |
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Andarist
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fix/generic-mapped-type-substitution-indexed-access
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@Andarist @weswigham Stumbled on this PR that I hadn't seen before. Something is not right here: type Remap<K extends string> = {
[P in K as `_${P}`]: P;
};
type Key = "foo" | "bar" | "baz";
function qq1<K extends string>(obj: Remap<K>, key: keyof Remap<K>) {
let s: `_${string}` = obj[key]; // Error expected here
}
function qq2(obj: Remap<Key>, key: keyof Remap<Key>) {
let s: `_${string}` = obj[key]; // Error (as expected)
}I think your comment here is really only true when the name type isn't a remapping. |
Andarist
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Jan 28, 2024
…nstraint from indexed access (microsoft#53066)" This reverts commit abb4052.
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fixes #50030