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Make T[K] yield never when T is never

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This commit is contained in:
Anders Hejlsberg
2018-08-09 16:31:54 -04:00
parent f6af618ab9
commit 8ff8008fc0
2 changed files with 3 additions and 1 deletions
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2
src/compiler/checker.ts
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@@ -9140,7 +9140,7 @@ namespace ts {
}
}
if (!(indexType.flags & TypeFlags.Nullable) && isTypeAssignableToKind(indexType, TypeFlags.StringLike | TypeFlags.NumberLike | TypeFlags.ESSymbolLike)) {
if (isTypeAny(objectType)) {
if (objectType.flags & (TypeFlags.Any | TypeFlags.Never)) {
return objectType;
}
const indexInfo = isTypeAssignableToKind(indexType, TypeFlags.NumberLike) && getIndexInfoOfType(objectType, IndexKind.Number) ||