Merge pull request #534 from kuhe/pagination-conditions

check for pagination stopOnSameToken option

smithy-typescript-codegen/src/main/java/software/amazon/smithy/typescript/codegen/PaginationGenerator.java

@@ -202,9 +202,9 @@ private void writePager() {
                 });
 
                 writer.write("yield page;");
+                writer.write("const prevToken = token;");
                 writer.write("token = page$L;", destructurePath(outputTokenName));
-
-                writer.write("hasNext = !!(token);");
+                writer.write("hasNext = !!(token && (!config.stopOnSameToken || token !== prevToken));");
             });
 
             writer.write("// @ts-ignore");