1 files changed, 25 insertions, 0 deletions
diff --git a/devtools/client/responsive/utils/key.js b/devtools/client/responsive/utils/key.js
new file mode 100644
index 0000000000..22c7278b2f
--- /dev/null
+++ b/devtools/client/responsive/utils/key.js
@@ -0,0 +1,25 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+const { KeyCodes } = require("resource://devtools/client/shared/keycodes.js");
+
+/**
+ * Helper to check if the provided key matches one of the expected keys.
+ * Keys will be prefixed with DOM_VK_ and should match a key in KeyCodes.
+ *
+ * @param {String} key
+ *        the key to check (can be a keyCode).
+ * @param {...String} keys
+ *        list of possible keys allowed.
+ * @return {Boolean} true if the key matches one of the keys.
+ */
+function isKeyIn(key, ...keys) {
+  return keys.some(expectedKey => {
+    return key === KeyCodes["DOM_VK_" + expectedKey];
+  });
+}
+
+exports.isKeyIn = isKeyIn;