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Quicker bail out for type analysis in nested loops

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This commit is contained in:
Anders Hejlsberg 2016-05-02 09:21:54 -07:00
parent bc5b6dc19c
commit f183f1ab38
1 changed files with 12 additions and 11 deletions
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23
src/compiler/checker.ts
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@ -7664,17 +7664,18 @@ namespace ts {
const type = flow.kind === FlowKind.LoopLabel ?
getTypeAtFlowNodeCached(antecedent) :
getTypeAtFlowNode(antecedent);
if (type) {
// If the type at a particular antecedent path is the declared type and the
// reference is known to always be assigned (i.e. when declared and initial types
// are the same), there is no reason to process more antecedents since the only
// possible outcome is subtypes that will be removed in the final union type anyway.
if (type === declaredType && declaredType === initialType) {
return type;
}
if (!contains(antecedentTypes, type)) {
antecedentTypes.push(type);
}
if (!type) {
break;
}
// If the type at a particular antecedent path is the declared type and the
// reference is known to always be assigned (i.e. when declared and initial types
// are the same), there is no reason to process more antecedents since the only
// possible outcome is subtypes that will be removed in the final union type anyway.
if (type === declaredType && declaredType === initialType) {
return type;
}
if (!contains(antecedentTypes, type)) {
antecedentTypes.push(type);
}
}
return antecedentTypes.length === 0 ? undefined :