diff --git a/src/compiler/parser.ts b/src/compiler/parser.ts
index dc53215263b..d7558c12385 100644
--- a/src/compiler/parser.ts
+++ b/src/compiler/parser.ts
@@ -97,8 +97,9 @@ namespace ts {
 
     type ForEachChildFunction = <T>(node: any, cbNode: (node: Node) => T | undefined, cbNodes?: (nodes: NodeArray<Node>) => T | undefined) => T | undefined;
 
-    const forEachChildTable: Array<ForEachChildFunction | undefined> = [];
-    for (let i = 0; i < SyntaxKind.Count; i++) forEachChildTable.push(undefined);
+    const forEachChildTable: (ForEachChildFunction | undefined)[] = [];
+    const forEachChildNoOpFn: ForEachChildFunction = (_node, _cbNode, _cbNodes) => undefined;
+    for (let i = 0; i < SyntaxKind.Count; i++) forEachChildTable.push(forEachChildNoOpFn);
     forEachChildTable[SyntaxKind.QualifiedName] = forEachQualifiedName;
     forEachChildTable[SyntaxKind.TypeParameter] = forEachTypeParameter;
     forEachChildTable[SyntaxKind.ShorthandPropertyAssignment] = forEachShorthandPropertyAssignment;