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Explicitly encode keyof behaviors for never and unknown into getIndexType (#30753)

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* Explicitly encode keyof behaviors for never and unknown into getIndexType

* Merge similar cases
This commit is contained in:
Wesley Wigham
2019-04-15 17:52:13 -07:00
committed by GitHub
parent 3dc78b6f3b
commit d405662eb6
11 changed files with 1723 additions and 1307 deletions
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3
src/compiler/checker.ts
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@@ -9841,7 +9841,8 @@ namespace ts {
maybeTypeOfKind(type, TypeFlags.InstantiableNonPrimitive) ? getIndexTypeForGenericType(<InstantiableType | UnionOrIntersectionType>type, stringsOnly) :
getObjectFlags(type) & ObjectFlags.Mapped ? filterType(getConstraintTypeFromMappedType(<MappedType>type), t => !(noIndexSignatures && t.flags & (TypeFlags.Any | TypeFlags.String | TypeFlags.Number))) :
type === wildcardType ? wildcardType :
type.flags & TypeFlags.Any ? keyofConstraintType :
type.flags & TypeFlags.Unknown ? neverType :
type.flags & (TypeFlags.Any | TypeFlags.Never) ? keyofConstraintType :
stringsOnly ? !noIndexSignatures && getIndexInfoOfType(type, IndexKind.String) ? stringType : getLiteralTypeFromProperties(type, TypeFlags.StringLiteral) :
!noIndexSignatures && getIndexInfoOfType(type, IndexKind.String) ? getUnionType([stringType, numberType, getLiteralTypeFromProperties(type, TypeFlags.UniqueESSymbol)]) :
!noIndexSignatures && getNonEnumNumberIndexInfo(type) ? getUnionType([numberType, getLiteralTypeFromProperties(type, TypeFlags.StringLiteral | TypeFlags.UniqueESSymbol)]) :