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Limit getLiteralTypeFromPropertyName to only return string-like types

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This commit is contained in:
Anders Hejlsberg
2018-04-06 09:52:00 -07:00
parent 39bb93fb1a
commit fc85ba9e6a
1 changed files with 9 additions and 3 deletions
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src/compiler/checker.ts
+9 -3
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@@ -8108,10 +8108,16 @@ namespace ts {
}
function getLiteralTypeFromPropertyName(prop: Symbol) {
if (getDeclarationModifierFlagsFromSymbol(prop) & ModifierFlags.NonPublicAccessibilityModifier || isKnownSymbol(prop)) {
return neverType;
if (!(getDeclarationModifierFlagsFromSymbol(prop) & ModifierFlags.NonPublicAccessibilityModifier)) {
const nameType = getLateBoundSymbol(prop).nameType;
if (nameType) {
return nameType.flags & TypeFlags.StringLiteral ? nameType : neverType;
}
if (!isKnownSymbol(prop)) {
return getLiteralType(symbolName(prop));
}
}
return getLateBoundSymbol(prop).nameType || getLiteralType(symbolName(prop));
return neverType;
}
function getLiteralTypeFromPropertyNames(type: Type) {