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Remove literal freshness when contextual type is a literal type

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This commit is contained in:
Anders Hejlsberg 2019-01-17 17:04:29 -08:00
parent da9feca0b0
commit bb1c91fac6
1 changed files with 3 additions and 1 deletions
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4
src/compiler/checker.ts
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@ -22962,7 +22962,9 @@ namespace ts {
context.contextualMapper = contextualMapper;
const checkMode = contextualMapper === identityMapper ? CheckMode.SkipContextSensitive :
contextualMapper ? CheckMode.Inferential : CheckMode.Contextual;
const result = checkExpression(node, checkMode);
const type = checkExpression(node, checkMode);
const result = maybeTypeOfKind(type, TypeFlags.Literal) && isLiteralOfContextualType(type, instantiateContextualType(contextualType, node)) ?
getRegularTypeOfLiteralType(type) : type;
context.contextualType = saveContextualType;
context.contextualMapper = saveContextualMapper;
return result;