1 files changed, 37 insertions, 0 deletions
diff --git a/devtools/client/debugger/src/actions/pause/fetchScopes.js b/devtools/client/debugger/src/actions/pause/fetchScopes.js
new file mode 100644
index 0000000000..1de472d1ed
--- /dev/null
+++ b/devtools/client/debugger/src/actions/pause/fetchScopes.js
@@ -0,0 +1,37 @@
+/* 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/>. */
+
+import {
+  getGeneratedFrameScope,
+  getOriginalFrameScope,
+} from "../../selectors/index";
+import { mapScopes } from "./mapScopes";
+import { generateInlinePreview } from "./inlinePreview";
+import { PROMISE } from "../utils/middleware/promise";
+
+export function fetchScopes(selectedFrame) {
+  return async function ({ dispatch, getState, client }) {
+    // See if we already fetched the scopes.
+    // We may have pause on multiple thread and re-select a paused thread
+    // for which we already fetched the scopes.
+    // Ignore pending scopes as the previous action may have been cancelled
+    // by context assertions.
+    let scopes = getGeneratedFrameScope(getState(), selectedFrame);
+    if (!scopes?.scope) {
+      scopes = dispatch({
+        type: "ADD_SCOPES",
+        selectedFrame,
+        [PROMISE]: client.getFrameScopes(selectedFrame),
+      });
+
+      scopes.then(() => {
+        dispatch(generateInlinePreview(selectedFrame));
+      });
+    }
+
+    if (!getOriginalFrameScope(getState(), selectedFrame)) {
+      await dispatch(mapScopes(selectedFrame, scopes));
+    }
+  };
+}