Fix resulting issue in compiler

Author: ahejlsberg

src/services/importTracker.ts

@@ -385,7 +385,7 @@ namespace ts.FindAllReferences {
     }
 
     /** Iterates over all statements at the top level or in module declarations. Returns the first truthy result. */
-    function forEachPossibleImportOrExportStatement<T>(sourceFileLike: SourceFileLike, action: (statement: Statement) => T): T | undefined {
+    function forEachPossibleImportOrExportStatement<T>(sourceFileLike: SourceFileLike, action: (statement: Statement) => T) {
         return forEach(sourceFileLike.kind === SyntaxKind.SourceFile ? sourceFileLike.statements : sourceFileLike.body!.statements, statement => // TODO: GH#18217
             action(statement) || (isAmbientModuleDeclaration(statement) && forEach(statement.body && statement.body.statements, action)));
     }