diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 747166f94eb65..007ac2542099c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -21203,7 +21203,7 @@ namespace ts {
                         let notNullOrUndefinedFilter = false;  // the aim of this filter is type has 'undefined',filter it out from result.
                         const isExpressionContainOptionalChain = isAccessExpressionContainOptionalChain(typeOfExpr.expression);
                         // ~undefined means other values except undefiend. boolean, bigint....
-                        if ((assumeTrue && literal.text !== "undefined")||(!assumeTrue && literal.text === "undefined")) {
+                        if ((assumeTrue && literal.text !== "undefined") || (!assumeTrue && literal.text === "undefined")) {
                             // !== undefined
                             // === ~undefined
                             // use full expression to narrow
@@ -21211,7 +21211,7 @@ namespace ts {
                             notNullOrUndefinedFilter = true;
                         }
                         else {
-                            // !== ~undefined, === undefined, !==undefined
+                            // !== ~undefined, === undefined
                             // use non-OptionalChain part to narrow
                             propertyTypeArray = narrowUnionTypeWithPropertyPathAndExpression(<UnionType>type, typeOfExpr.expression,/* optionalChainSlice */ true);
                             if (isExpressionContainOptionalChain) {