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No contextual types from circular mapped type properties

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This commit is contained in:
Anders Hejlsberg
2020-05-18 19:46:35 -07:00
parent 6ba8c2725b
commit 97cb8188f0
1 changed files with 5 additions and 1 deletions
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src/compiler/checker.ts
+5 -1
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@@ -22469,6 +22469,10 @@ namespace ts {
}
}
function isCircularMappedProperty(symbol: Symbol) {
return !!(getCheckFlags(symbol) & CheckFlags.Mapped && !(<MappedSymbol>symbol).type && findResolutionCycleStartIndex(symbol, TypeSystemPropertyName.Type) >= 0);
}
function getTypeOfPropertyOfContextualType(type: Type, name: __String) {
return mapType(type, t => {
if (isGenericMappedType(t)) {
@@ -22482,7 +22486,7 @@ namespace ts {
else if (t.flags & TypeFlags.StructuredType) {
const prop = getPropertyOfType(t, name);
if (prop) {
return getTypeOfSymbol(prop);
return isCircularMappedProperty(prop) ? undefined : getTypeOfSymbol(prop);
}
if (isTupleType(t)) {
const restType = getRestTypeOfTupleType(t);