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Optimize the clearing of inferredTypes

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Jason Freeman 2015-03-13 17:03:13 -07:00
parent df6f856ad5
commit 495caf0f67
1 changed files with 5 additions and 1 deletions
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6
src/compiler/checker.ts
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@ -6344,7 +6344,11 @@ module ts {
// Clear out all the inference results from the last time inferTypeArguments was called on this context
for (let i = 0; i < typeParameters.length; i++) {
context.inferredTypes[i] = undefined;
// As an optimization, we don't have to clear (and later recompute) inferred types
// for type parameters that have already been fixed on the previous call to inferTypeArguments
if (!context.inferences[i].isFixed) {
context.inferredTypes[i] = undefined;
}
}
// We perform two passes over the arguments. In the first pass we infer from all arguments, but use