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Fix bounds check

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This commit is contained in:
Anders Hejlsberg
2019-10-05 19:14:48 -07:00
parent 064b296559
commit 720964f729
1 changed files with 1 additions and 1 deletions
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src/compiler/checker.ts
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@@ -19106,7 +19106,7 @@ namespace ts {
const flowType = getTypeAtFlowNode(flow.antecedent);
const type = getTypeFromFlowType(flowType);
const narrowedType = predicate.type ? narrowTypeByTypePredicate(type, predicate, flow.node, /*assumeTrue*/ true) :
predicate.kind === TypePredicateKind.AssertsIdentifier && predicate.parameterIndex < flow.node.arguments.length ? narrowTypeByAssertion(type, flow.node.arguments[predicate.parameterIndex]) :
predicate.kind === TypePredicateKind.AssertsIdentifier && predicate.parameterIndex >= 0 && predicate.parameterIndex < flow.node.arguments.length ? narrowTypeByAssertion(type, flow.node.arguments[predicate.parameterIndex]) :
type;
return narrowedType === type ? flowType : createFlowType(narrowedType, isIncomplete(flowType));
}