1 files changed, 41 insertions, 0 deletions
diff --git a/devtools/client/webconsole/enhancers/message-cache-clearing.js b/devtools/client/webconsole/enhancers/message-cache-clearing.js
new file mode 100644
index 0000000000..f2f4b90eab
--- /dev/null
+++ b/devtools/client/webconsole/enhancers/message-cache-clearing.js
@@ -0,0 +1,41 @@
+/* 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 {
+  MESSAGES_CLEAR,
+} = require("resource://devtools/client/webconsole/constants.js");
+
+/**
+ * This enhancer is responsible for clearing the messages caches using the
+ * webconsoleFront when the user clear the messages (either by direct UI action, or via
+ * `console.clear()`).
+ */
+function enableMessagesCacheClearing(webConsoleUI) {
+  return next => (reducer, initialState, enhancer) => {
+    function messagesCacheClearingEnhancer(state, action) {
+      const storeHadMessages =
+        state?.messages?.mutableMessagesById &&
+        state.messages.mutableMessagesById.size > 0;
+      state = reducer(state, action);
+
+      if (storeHadMessages && webConsoleUI && action.type === MESSAGES_CLEAR) {
+        webConsoleUI.clearMessagesCache();
+
+        // cleans up all the network data provider internal state
+        webConsoleUI.networkDataProvider?.destroy();
+
+        if (webConsoleUI.hud?.toolbox) {
+          webConsoleUI.hud.toolbox.setErrorCount(0);
+        }
+      }
+      return state;
+    }
+
+    return next(messagesCacheClearingEnhancer, initialState, enhancer);
+  };
+}
+
+module.exports = enableMessagesCacheClearing;