1 files changed, 27 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/utils/memoizeLast.js b/devtools/client/debugger/src/utils/memoizeLast.js
new file mode 100644
index 0000000000..b3c46cab57
--- /dev/null
+++ b/devtools/client/debugger/src/utils/memoizeLast.js
@@ -0,0 +1,27 @@
+/* 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/>. */
+
+export function memoizeLast(fn) {
+  let lastArgs;
+  let lastResult;
+
+  const memoized = (...args) => {
+    if (
+      lastArgs &&
+      args.length === lastArgs.length &&
+      args.every((arg, i) => arg === lastArgs[i])
+    ) {
+      return lastResult;
+    }
+
+    lastArgs = args;
+    lastResult = fn(...args);
+
+    return lastResult;
+  };
+
+  return memoized;
+}
+
+export default memoizeLast;