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Use union type when binding element has initializer

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This commit is contained in:
Anders Hejlsberg 2016-08-27 09:40:49 -07:00
parent 598ca48c94
commit a25104e152
1 changed files with 3 additions and 1 deletions
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4
src/compiler/checker.ts
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@ -2974,7 +2974,9 @@ namespace ts {
if (strictNullChecks && declaration.initializer && !(getFalsyFlags(checkExpressionCached(declaration.initializer)) & TypeFlags.Undefined)) {
type = getTypeWithFacts(type, TypeFacts.NEUndefined);
}
return type;
return declaration.initializer ?
getUnionType([type, checkExpressionCached(declaration.initializer)], /*subtypeReduction*/ true) :
type;
}
function getTypeForVariableLikeDeclarationFromJSDocComment(declaration: VariableLikeDeclaration) {