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added a clarifying comment

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This commit is contained in:
Arthur Ozga 2015-08-07 11:07:06 -07:00
parent cbb159770f
commit 410e4e4df7
1 changed files with 8 additions and 3 deletions
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11
src/compiler/checker.ts
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@ -3474,8 +3474,10 @@ namespace ts {
return emptyArray;
}
// Return the signatures of the given kind in the given type. Creates synthetic union signatures when necessary and
// maps primitive types and type parameters are to their apparent types.
/**
* Return the signatures of the given kind in the given type. Creates synthetic union signatures when necessary and
* maps primitive types and type parameters are to their apparent types.
*/
function getSignaturesOfType(type: Type, kind: SignatureKind): Signature[] {
return getSignaturesOfStructuredType(getApparentType(type), kind);
}
@ -5098,8 +5100,11 @@ namespace ts {
// Because the "abstractness" of a class is the same across all construct signatures
// (internally we are checking the corresponding declaration), it is enough to perform
// the check and report an error once over all pairs of source and target construct signatures.
let sourceSig = sourceSignatures[0];
//
// sourceSig and targetSig are (possibly) undefined.
//
// Note that in an extends-clause, targetSignatures is stripped, so the check never proceeds.
let sourceSig = sourceSignatures[0];
let targetSig = targetSignatures[0];
result &= abstractSignatureRelatedTo(source, sourceSig, target, targetSig);