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Don’t widen literals based on bogus contextual type instantiation

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This commit is contained in:
Andrew Branch
2022-05-12 09:39:19 -07:00
parent dc325fe21c
commit b00e6b51a2
1 changed files with 3 additions and 3 deletions
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6
src/compiler/checker.ts
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@@ -21248,8 +21248,8 @@ namespace ts {
type;
}
function getWidenedLiteralLikeTypeForContextualType(type: Type, contextualType: Type | undefined) {
if (!isLiteralOfContextualType(type, contextualType)) {
function getWidenedLiteralLikeTypeForContextualType(type: Type, contextualType: Type | undefined, contextNode?: Node) {
if (!isLiteralOfContextualType(type, contextualType) && !(contextNode && isLiteralOfContextualType(type, instantiateContextualType(contextualType, contextNode)))) {
type = getWidenedUniqueESSymbolType(getWidenedLiteralType(type));
}
return type;
@@ -34495,7 +34495,7 @@ namespace ts {
const type = checkExpression(node, checkMode, forceTuple);
return isConstContext(node) || isCommonJsExportedExpression(node) ? getRegularTypeOfLiteralType(type) :
isTypeAssertion(node) ? type :
getWidenedLiteralLikeTypeForContextualType(type, instantiateContextualType(arguments.length === 2 ? getContextualType(node) : contextualType, node));
getWidenedLiteralLikeTypeForContextualType(type, arguments.length === 2 ? getContextualType(node) : contextualType, node);
}
function checkPropertyAssignment(node: PropertyAssignment, checkMode?: CheckMode): Type {