One SearchInput to rule them all

ts/util/getClassNamesFor.ts

@@ -0,0 +1,17 @@
+// Copyright 2021 Signal Messenger, LLC
+// SPDX-License-Identifier: AGPL-3.0-only
+
+import classNames from 'classnames';
+
+export function getClassNamesFor(
+  ...modules: Array<string | undefined>
+): (modifier?: string) => string {
+  return modifier => {
+    const cx = modules.map(parentModule =>
+      parentModule && modifier !== undefined
+        ? `${parentModule}${modifier}`
+        : undefined
+    );
+    return classNames(cx);
+  };
+}