1 files changed, 31 insertions, 0 deletions
diff --git a/devtools/client/shared/redux/middleware/log.js b/devtools/client/shared/redux/middleware/log.js
new file mode 100644
index 0000000000..4ea09491ca
--- /dev/null
+++ b/devtools/client/shared/redux/middleware/log.js
@@ -0,0 +1,31 @@
+/* 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";
+
+/**
+ * A middleware that logs all actions coming through the system
+ * to the console.
+ */
+function log({ dispatch, getState }) {
+  return next => action => {
+    try {
+      // Only print the action type, rather than printing the whole object
+      console.log("[DISPATCH] action type:", action.type);
+      /*
+       * USE WITH CAUTION!! This will output everything from an action object,
+       * and these can be quite large. Printing out large objects will slow
+       * down tests and cause test failures
+       *
+       * console.log("[DISPATCH]", JSON.stringify(action, null, 2));
+       */
+    } catch (e) {
+      // this occurs if JSON.stringify throws.
+      console.warn(e);
+      console.log("[DISPATCH]", action);
+    }
+    next(action);
+  };
+}
+
+exports.log = log;