1 files changed, 37 insertions, 0 deletions
diff --git a/packages/idb-bridge/src/util/fakeDOMStringList.ts b/packages/idb-bridge/src/util/fakeDOMStringList.ts
new file mode 100644
index 000000000..5add17588
--- /dev/null
+++ b/packages/idb-bridge/src/util/fakeDOMStringList.ts
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2017 Jeremy Scheff
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing
+ * permissions and limitations under the License.
+ */
+
+import { FakeDOMStringList } from "./types";
+
+// Would be nicer to sublcass Array, but I'd have to sacrifice Node 4 support to do that.
+
+const fakeDOMStringList = (arr: string[]): FakeDOMStringList => {
+  const arr2 = arr.slice();
+
+  Object.defineProperty(arr2, "contains", {
+    // tslint:disable-next-line object-literal-shorthand
+    value: (value: string) => arr2.indexOf(value) >= 0,
+  });
+
+  Object.defineProperty(arr2, "item", {
+    // tslint:disable-next-line object-literal-shorthand
+    value: (i: number) => arr2[i],
+  });
+
+  return arr2 as FakeDOMStringList;
+};
+
+export default fakeDOMStringList;