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diff --git a/devtools/client/responsive.html/actions/index.js b/devtools/client/responsive.html/actions/index.js
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+/* 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";
+
+// This file lists all of the actions available in responsive design.  This
+// central list of constants makes it easy to see all possible action names at
+// a glance.  Please add a comment with each new action type.
+
+const { createEnum } = require("../utils/enum");
+
+createEnum([
+
+  // Add a new device.
+  "ADD_DEVICE",
+
+  // Add a new device type.
+  "ADD_DEVICE_TYPE",
+
+  // Add an additional viewport to display the document.
+  "ADD_VIEWPORT",
+
+  // Change the device displayed in the viewport.
+  "CHANGE_DEVICE",
+
+  // Change the location of the page.  This may be triggered by the user
+  // directly entering a new URL, navigating with links, etc.
+  "CHANGE_LOCATION",
+
+  // The pixel ratio of the display has changed. This may be triggered by the user
+  // when changing the monitor resolution, or when the window is dragged to a different
+  // display with a different pixel ratio.
+  "CHANGE_DISPLAY_PIXEL_RATIO",
+
+  // Change the network throttling profile.
+  "CHANGE_NETWORK_THROTTLING",
+
+  // The pixel ratio of the viewport has changed. This may be triggered by the user
+  // when changing the device displayed in the viewport, or when a pixel ratio is
+  // selected from the DPR dropdown.
+  "CHANGE_PIXEL_RATIO",
+
+  // Change the touch simulation state.
+  "CHANGE_TOUCH_SIMULATION",
+
+  // Indicates that the device list is being loaded
+  "LOAD_DEVICE_LIST_START",
+
+  // Indicates that the device list loading action threw an error
+  "LOAD_DEVICE_LIST_ERROR",
+
+  // Indicates that the device list has been loaded successfully
+  "LOAD_DEVICE_LIST_END",
+
+  // Remove the viewport's device assocation.
+  "REMOVE_DEVICE",
+
+  // Resize the viewport.
+  "RESIZE_VIEWPORT",
+
+  // Rotate the viewport.
+  "ROTATE_VIEWPORT",
+
+  // Take a screenshot of the viewport.
+  "TAKE_SCREENSHOT_START",
+
+  // Indicates when the screenshot action ends.
+  "TAKE_SCREENSHOT_END",
+
+  // Update the device display state in the device selector.
+  "UPDATE_DEVICE_DISPLAYED",
+
+  // Update the device modal open state.
+  "UPDATE_DEVICE_MODAL_OPEN",
+
+], module.exports);