1 files changed, 46 insertions, 0 deletions
diff --git a/devtools/server/actors/resources/last-private-context-exit.js b/devtools/server/actors/resources/last-private-context-exit.js
new file mode 100644
index 0000000000..ec9ee6b91d
--- /dev/null
+++ b/devtools/server/actors/resources/last-private-context-exit.js
@@ -0,0 +1,46 @@
+/* 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 {
+  TYPES: { LAST_PRIVATE_CONTEXT_EXIT },
+} = require("resource://devtools/server/actors/resources/index.js");
+
+class LastPrivateContextExitWatcher {
+  #onAvailable;
+
+  /**
+   * Start watching for all times where we close a private browsing top level window.
+   * Meaning we should clear the console for all logs generated from these private browsing contexts.
+   *
+   * @param WatcherActor watcherActor
+   *        The watcher actor in the parent process from which we should
+   *        observe these events.
+   * @param Object options
+   *        Dictionary object with following attributes:
+   *        - onAvailable: mandatory function
+   *          This will be called for each resource.
+   */
+  async watch(watcherActor, { onAvailable }) {
+    this.#onAvailable = onAvailable;
+    Services.obs.addObserver(this, "last-pb-context-exited");
+  }
+
+  observe(subject, topic) {
+    if (topic === "last-pb-context-exited") {
+      this.#onAvailable([
+        {
+          resourceType: LAST_PRIVATE_CONTEXT_EXIT,
+        },
+      ]);
+    }
+  }
+
+  destroy() {
+    Services.obs.removeObserver(this, "last-pb-context-exited");
+  }
+}
+
+module.exports = LastPrivateContextExitWatcher;