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Only add unique inferences to candidate arrays

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This commit is contained in:
Anders Hejlsberg 2018-09-26 06:54:37 -07:00
parent 272157185f
commit f59229bf22
1 changed files with 2 additions and 5 deletions
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7
src/compiler/checker.ts
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@ -1,6 +1,3 @@
/* @internal */
namespace ts {
const ambientModuleSymbolRegex = /^".+"$/;
@ -13553,10 +13550,10 @@ namespace ts {
// We make contravariant inferences only if we are in a pure contravariant position,
// i.e. only if we have not descended into a bivariant position.
if (contravariant && !bivariant) {
inference.contraCandidates = append(inference.contraCandidates, candidate);
inference.contraCandidates = appendIfUnique(inference.contraCandidates, candidate);
}
else {
inference.candidates = append(inference.candidates, candidate);
inference.candidates = appendIfUnique(inference.candidates, candidate);
}
}
if (!(priority & InferencePriority.ReturnType) && target.flags & TypeFlags.TypeParameter && !isTypeParameterAtTopLevel(originalTarget, <TypeParameter>target)) {