Use canHaveFlowNode in checkIfExpressionRefinesParameter (#58816)

microsoft · Oct 31, 2024 · a271797 · a271797
1 parent f478257
commit a271797
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
@@ -38627,7 +38627,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
     }
 
     function checkIfExpressionRefinesParameter(func: FunctionLikeDeclaration, expr: Expression, param: ParameterDeclaration, initType: Type): Type | undefined {
-        const antecedent = (expr as Expression & { flowNode?: FlowNode; }).flowNode ||
+        const antecedent = canHaveFlowNode(expr) && expr.flowNode ||
             expr.parent.kind === SyntaxKind.ReturnStatement && (expr.parent as ReturnStatement).flowNode ||
             createFlowNode(FlowFlags.Start, /*node*/ undefined, /*antecedent*/ undefined);
         const trueCondition = createFlowNode(FlowFlags.TrueCondition, expr, antecedent);