[DevTools] Show Owner Stacks in "rendered by" View (#34130)

This shows the stack trace of the JSX at each level so now you can also
jump to the code location for the JSX callsite. The visual is similar to
the owner stacks with `createTask` except when you click the `<...>` you
jump to the Instance in the Components panel.

<img width="593" height="450" alt="Screenshot 2025-08-08 at 12 19 21 AM"
src="https://github.com/user-attachments/assets/dac35faf-9d99-46ce-8b41-7c6fe24625d2"
/>

I'm not sure it's really necessary to have all the JSX stacks of every
owner. We could just have it for the current component and then the rest
of the owners you could get to if you just click that owner instance.

As a bonus, I also use the JSX callsite as the fallback for the "View
Source" button. This is primarily useful for built-ins like `<div>` and
`<Suspense>` that don't have any implementation to jump to anyway. It's
useful to be able to jump to where a boundary was defined.

Author: sebmarkbage

packages/react-devtools-inline/__tests__/__e2e__/devtools-utils.js

@@ -64,11 +64,22 @@ async function selectElement(
           createTestNameSelector('InspectedElementView-Owners'),
         ])[0];
 
+        if (!ownersList) {
+          return false;
+        }
+
+        const owners = findAllNodes(ownersList, [
+          createTestNameSelector('OwnerView'),
+        ]);
+
         return (
           title &&
           title.innerText.includes(titleText) &&
-          ownersList &&
-          ownersList.innerText.includes(ownersListText)
+          owners &&
+          owners
+            .map(node => node.innerText)
+            .join('\n')
+            .includes(ownersListText)
         );
       },
       {titleText: displayName, ownersListText: waitForOwnersText}

packages/react-devtools-shared/src/__tests__/profilingCache-test.js

@@ -949,6 +949,7 @@ describe('ProfilingCache', () => {
               "hocDisplayNames": null,
               "id": 1,
               "key": null,
+              "stack": null,
               "type": 11,
             },
           ],

packages/react-devtools-shared/src/backend/fiber/renderer.js

@@ -4991,6 +4991,10 @@ export function attach(
         id: instance.id,
         key: fiber.key,
         env: null,
+        stack:
+          fiber._debugOwner == null || fiber._debugStack == null
+            ? null
+            : parseStackTrace(fiber._debugStack, 1),
         type: getElementTypeForFiber(fiber),
       };
     } else {
@@ -5000,6 +5004,10 @@ export function attach(
         id: instance.id,
         key: componentInfo.key == null ? null : componentInfo.key,
         env: componentInfo.env == null ? null : componentInfo.env,
+        stack:
+          componentInfo.owner == null || componentInfo.debugStack == null
+            ? null
+            : parseStackTrace(componentInfo.debugStack, 1),
         type: ElementTypeVirtual,
       };
     }
@@ -5598,6 +5606,11 @@ export function attach(
 
       source,
 
+      stack:
+        fiber._debugOwner == null || fiber._debugStack == null
+          ? null
+          : parseStackTrace(fiber._debugStack, 1),
+
       // Does the component have legacy context attached to it.
       hasLegacyContext,
 
@@ -5698,6 +5711,11 @@ export function attach(
 
       source,
 
+      stack:
+        componentInfo.owner == null || componentInfo.debugStack == null
+          ? null
+          : parseStackTrace(componentInfo.debugStack, 1),
+
       // Does the component have legacy context attached to it.
       hasLegacyContext: false,
 

packages/react-devtools-shared/src/backend/legacy/renderer.js

@@ -796,6 +796,7 @@ export function attach(
             id: getID(owner),
             key: element.key,
             env: null,
+            stack: null,
             type: getElementType(owner),
           });
           if (owner._currentElement) {
@@ -837,6 +838,8 @@ export function attach(
 
       source: null,
 
+      stack: null,
+
       // Only legacy context exists in legacy versions.
       hasLegacyContext: true,
 

packages/react-devtools-shared/src/backend/types.js

@@ -257,6 +257,7 @@ export type SerializedElement = {
   id: number,
   key: number | string | null,
   env: null | string,
+  stack: null | ReactStackTrace,
   type: ElementType,
 };
 
@@ -308,6 +309,9 @@ export type InspectedElement = {
 
   source: ReactFunctionLocation | null,
 
+  // The location of the JSX creation.
+  stack: ReactStackTrace | null,
+
   type: ElementType,
 
   // Meta information about the root this element belongs to.

packages/react-devtools-shared/src/backendAPI.js

@@ -257,6 +257,7 @@ export function convertInspectedElementBackendToFrontend(
     owners,
     env,
     source,
+    stack,
     context,
     hooks,
     plugins,
@@ -295,6 +296,7 @@ export function convertInspectedElementBackendToFrontend(
     // Previous backend implementations (<= 6.1.5) have a different interface for Source.
     // This gates the source features for only compatible backends: >= 6.1.6
     source: Array.isArray(source) ? source : null,
+    stack: stack,
     type,
     owners:
       owners === null

packages/react-devtools-shared/src/devtools/views/Components/InspectedElement.js

@@ -51,12 +51,19 @@ export default function InspectedElementWrapper(_: Props): React.Node {
 
   const fetchFileWithCaching = useContext(FetchFileWithCachingContext);
 
+  const source =
+    inspectedElement == null
+      ? null
+      : inspectedElement.source != null
+        ? inspectedElement.source
+        : inspectedElement.stack != null && inspectedElement.stack.length > 0
+          ? inspectedElement.stack[0]
+          : null;
+
   const symbolicatedSourcePromise: null | Promise<ReactFunctionLocation | null> =
     React.useMemo(() => {
-      if (inspectedElement == null) return null;
       if (fetchFileWithCaching == null) return Promise.resolve(null);
 
-      const {source} = inspectedElement;
       if (source == null) return Promise.resolve(null);
 
       const [, sourceURL, line, column] = source;
@@ -66,7 +73,7 @@ export default function InspectedElementWrapper(_: Props): React.Node {
         line,
         column,
       );
-    }, [inspectedElement]);
+    }, [source]);
 
   const element =
     inspectedElementID !== null
@@ -223,13 +230,12 @@ export default function InspectedElementWrapper(_: Props): React.Node {
 
         {!alwaysOpenInEditor &&
           !!editorURL &&
-          inspectedElement != null &&
-          inspectedElement.source != null &&
+          source != null &&
           symbolicatedSourcePromise != null && (
             <React.Suspense fallback={<Skeleton height={16} width={24} />}>
               <OpenInEditorButton
                 editorURL={editorURL}
-                source={inspectedElement.source}
+                source={source}
                 symbolicatedSourcePromise={symbolicatedSourcePromise}
               />
             </React.Suspense>
@@ -276,7 +282,7 @@ export default function InspectedElementWrapper(_: Props): React.Node {
 
         {!hideViewSourceAction && (
           <InspectedElementViewSourceButton
-            source={inspectedElement ? inspectedElement.source : null}
+            source={source}
             symbolicatedSourcePromise={symbolicatedSourcePromise}
           />
         )}

packages/react-devtools-shared/src/devtools/views/Components/InspectedElementView.js

@@ -22,6 +22,7 @@ import InspectedElementSuspendedBy from './InspectedElementSuspendedBy';
 import NativeStyleEditor from './NativeStyleEditor';
 import {enableStyleXFeatures} from 'react-devtools-feature-flags';
 import InspectedElementSourcePanel from './InspectedElementSourcePanel';
+import StackTraceView from './StackTraceView';
 import OwnerView from './OwnerView';
 
 import styles from './InspectedElementView.css';
@@ -52,6 +53,7 @@ export default function InspectedElementView({
   symbolicatedSourcePromise,
 }: Props): React.Node {
   const {
+    stack,
     owners,
     rendererPackageName,
     rendererVersion,
@@ -68,8 +70,9 @@ export default function InspectedElementView({
       ? `${rendererPackageName}@${rendererVersion}`
       : null;
   const showOwnersList = owners !== null && owners.length > 0;
+  const showStack = stack != null && stack.length > 0;
   const showRenderedBy =
-    showOwnersList || rendererLabel !== null || rootType !== null;
+    showStack || showOwnersList || rendererLabel !== null || rootType !== null;
 
   return (
     <Fragment>
@@ -168,20 +171,26 @@ export default function InspectedElementView({
             data-testname="InspectedElementView-Owners">
             <div className={styles.OwnersHeader}>rendered by</div>
 
+            {showStack ? <StackTraceView stack={stack} /> : null}
             {showOwnersList &&
               owners?.map(owner => (
-                <OwnerView
-                  key={owner.id}
-                  displayName={owner.displayName || 'Anonymous'}
-                  hocDisplayNames={owner.hocDisplayNames}
-                  environmentName={
-                    inspectedElement.env === owner.env ? null : owner.env
-                  }
-                  compiledWithForget={owner.compiledWithForget}
-                  id={owner.id}
-                  isInStore={store.containsElement(owner.id)}
-                  type={owner.type}
-                />
+                <>
+                  <OwnerView
+                    key={owner.id}
+                    displayName={owner.displayName || 'Anonymous'}
+                    hocDisplayNames={owner.hocDisplayNames}
+                    environmentName={
+                      inspectedElement.env === owner.env ? null : owner.env
+                    }
+                    compiledWithForget={owner.compiledWithForget}
+                    id={owner.id}
+                    isInStore={store.containsElement(owner.id)}
+                    type={owner.type}
+                  />
+                  {owner.stack != null && owner.stack.length > 0 ? (
+                    <StackTraceView stack={owner.stack} />
+                  ) : null}
+                </>
               ))}
 
             {rootType !== null && (

packages/react-devtools-shared/src/devtools/views/Components/OwnerView.js

@@ -60,7 +60,8 @@ export default function OwnerView({
       <span className={styles.OwnerContent}>
         <span
           className={`${styles.Owner} ${isInStore ? '' : styles.NotInStore}`}
-          title={displayName}>
+          title={displayName}
+          data-testname="OwnerView">
           {'<' + displayName + '>'}
         </span>
 

packages/react-devtools-shared/src/frontend/types.js

@@ -216,6 +216,7 @@ export type SerializedElement = {
   id: number,
   key: number | string | null,
   env: null | string,
+  stack: null | ReactStackTrace,
   hocDisplayNames: Array<string> | null,
   compiledWithForget: boolean,
   type: ElementType,
@@ -279,6 +280,9 @@ export type InspectedElement = {
   // Location of component in source code.
   source: ReactFunctionLocation | null,
 
+  // The location of the JSX creation.
+  stack: ReactStackTrace | null,
+
   type: ElementType,
 
   // Meta information about the root this element belongs to.