1 files changed, 45 insertions, 0 deletions
diff --git a/devtools/shared/debounce.js b/devtools/shared/debounce.js
new file mode 100644
index 0000000000..4357a44453
--- /dev/null
+++ b/devtools/shared/debounce.js
@@ -0,0 +1,45 @@
+/* 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";
+
+/**
+ * Create a debouncing function wrapper to only call the target function after a certain
+ * amount of time has passed without it being called.
+ *
+ * @param {Function} func
+ *         The function to debounce
+ * @param {number} wait
+ *         The wait period
+ * @param {Object} scope
+ *         The scope to use for func
+ * @return {Function} The debounced function, which has a `cancel` method that the
+ *                    consumer can call to cancel any pending setTimeout callback.
+ */
+exports.debounce = function(func, wait, scope) {
+  let timer = null;
+
+  function clearTimer(resetTimer = false) {
+    if (timer) {
+      clearTimeout(timer);
+    }
+    if (resetTimer) {
+      timer = null;
+    }
+  }
+
+  const debouncedFunction = function() {
+    clearTimer();
+
+    const args = arguments;
+    timer = setTimeout(function() {
+      timer = null;
+      func.apply(scope, args);
+    }, wait);
+  };
+
+  debouncedFunction.cancel = clearTimer.bind(null, true);
+
+  return debouncedFunction;
+};