feat[react-devtools]: display forget badge for components in profiling session (#29014)

# Summary
- `compiledWithForget` field for nodes is now propagated from the
backend to frontend profiler stores
- Corresponding node with such field will have a `✨` prefix displayed
before its displayName
<img width="1728" alt="Screenshot 2024-05-07 at 15 05 37"
src="https://github.com/facebook/react/assets/28902667/fe044d40-52cb-4169-867d-5a2d72e3275b">

- Badges are now displayed on the right panel when some fiber is
selected in a specific commit
<img width="1728" alt="Screenshot 2024-05-07 at 15 05 50"
src="https://github.com/facebook/react/assets/28902667/297ba5ca-404d-4172-b9bf-bfed7978afe5">

- Badges are also displayed when user hovers over some node in the tree
<img width="1728" alt="Screenshot 2024-05-07 at 15 25 22"
src="https://github.com/facebook/react/assets/28902667/bee47884-61d1-46b6-a483-717fc148893a">

Author: hoxyq

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

@@ -124,8 +124,8 @@ describe('profiling charts', () => {
               "actualDuration": 0,
               "didRender": true,
               "id": 5,
-              "label": "Memo(Child) key="third" (<0.1ms of <0.1ms)",
-              "name": "Memo(Child)",
+              "label": "Child (Memo) key="third" (<0.1ms of <0.1ms)",
+              "name": "Child",
               "offset": 15,
               "selfDuration": 0,
               "treeBaseDuration": 0,
@@ -134,8 +134,8 @@ describe('profiling charts', () => {
               "actualDuration": 2,
               "didRender": true,
               "id": 4,
-              "label": "Memo(Child) key="second" (2ms of 2ms)",
-              "name": "Memo(Child)",
+              "label": "Child (Memo) key="second" (2ms of 2ms)",
+              "name": "Child",
               "offset": 13,
               "selfDuration": 2,
               "treeBaseDuration": 2,
@@ -144,8 +144,8 @@ describe('profiling charts', () => {
               "actualDuration": 3,
               "didRender": true,
               "id": 3,
-              "label": "Memo(Child) key="first" (3ms of 3ms)",
-              "name": "Memo(Child)",
+              "label": "Child (Memo) key="first" (3ms of 3ms)",
+              "name": "Child",
               "offset": 10,
               "selfDuration": 3,
               "treeBaseDuration": 3,
@@ -175,8 +175,8 @@ describe('profiling charts', () => {
               "actualDuration": 0,
               "didRender": false,
               "id": 5,
-              "label": "Memo(Child) key="third"",
-              "name": "Memo(Child)",
+              "label": "Child (Memo) key="third"",
+              "name": "Child",
               "offset": 15,
               "selfDuration": 0,
               "treeBaseDuration": 0,
@@ -185,8 +185,8 @@ describe('profiling charts', () => {
               "actualDuration": 0,
               "didRender": false,
               "id": 4,
-              "label": "Memo(Child) key="second"",
-              "name": "Memo(Child)",
+              "label": "Child (Memo) key="second"",
+              "name": "Child",
               "offset": 13,
               "selfDuration": 0,
               "treeBaseDuration": 2,
@@ -195,8 +195,8 @@ describe('profiling charts', () => {
               "actualDuration": 0,
               "didRender": false,
               "id": 3,
-              "label": "Memo(Child) key="first"",
-              "name": "Memo(Child)",
+              "label": "Child (Memo) key="first"",
+              "name": "Child",
               "offset": 10,
               "selfDuration": 0,
               "treeBaseDuration": 3,
@@ -264,20 +264,20 @@ describe('profiling charts', () => {
           },
           {
             "id": 3,
-            "label": "Memo(Child) (Memo) key="first" (3ms)",
-            "name": "Memo(Child)",
+            "label": "Child (Memo) key="first" (3ms)",
+            "name": "Child",
             "value": 3,
           },
           {
             "id": 4,
-            "label": "Memo(Child) (Memo) key="second" (2ms)",
-            "name": "Memo(Child)",
+            "label": "Child (Memo) key="second" (2ms)",
+            "name": "Child",
             "value": 2,
           },
           {
             "id": 5,
-            "label": "Memo(Child) (Memo) key="third" (<0.1ms)",
-            "name": "Memo(Child)",
+            "label": "Child (Memo) key="third" (<0.1ms)",
+            "name": "Child",
             "value": 0,
           },
         ]

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

@@ -214,6 +214,7 @@ export default class ProfilerStore extends EventEmitter<{
         hocDisplayNames: element.hocDisplayNames,
         key: element.key,
         type: element.type,
+        compiledWithForget: element.compiledWithForget,
       };
       profilingSnapshots.set(elementID, snapshotNode);
 

packages/react-devtools-shared/src/devtools/views/Components/InspectedElementBadges.css

@@ -1,5 +1,4 @@
 .Root {
-  padding: 0.25rem;
   user-select: none;
   display: inline-flex;
 }

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

@@ -7,8 +7,6 @@
  * @flow
  */
 
-import type {Element} from 'react-devtools-shared/src/frontend/types';
-
 import * as React from 'react';
 
 import Badge from './Badge';
@@ -17,11 +15,20 @@ import ForgetBadge from './ForgetBadge';
 import styles from './InspectedElementBadges.css';
 
 type Props = {
-  element: Element,
+  hocDisplayNames: null | Array<string>,
+  compiledWithForget: boolean,
 };
 
-export default function InspectedElementBadges({element}: Props): React.Node {
-  const {hocDisplayNames, compiledWithForget} = element;
+export default function InspectedElementBadges({
+  hocDisplayNames,
+  compiledWithForget,
+}: Props): React.Node {
+  if (
+    !compiledWithForget &&
+    (hocDisplayNames == null || hocDisplayNames.length === 0)
+  ) {
+    return null;
+  }
 
   return (
     <div className={styles.Root}>

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

@@ -25,6 +25,10 @@
   line-height: var(--line-height-data);
 }
 
+.InspectedElementBadgesContainer {
+  padding: 0.25rem;
+}
+
 .Owner {
   border-radius: 0.25rem;
   padding: 0.125rem 0.25rem;

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

@@ -85,7 +85,12 @@ export default function InspectedElementView({
   return (
     <Fragment>
       <div className={styles.InspectedElement}>
-        <InspectedElementBadges element={element} />
+        <div className={styles.InspectedElementBadgesContainer}>
+          <InspectedElementBadges
+            hocDisplayNames={element.hocDisplayNames}
+            compiledWithForget={element.compiledWithForget}
+          />
+        </div>
 
         <InspectedElementPropsTree
           bridge={bridge}

packages/react-devtools-shared/src/devtools/views/Profiler/CommitTreeBuilder.js

@@ -17,7 +17,10 @@ import {
   TREE_OPERATION_UPDATE_TREE_BASE_DURATION,
   TREE_OPERATION_UPDATE_ERRORS_OR_WARNINGS,
 } from 'react-devtools-shared/src/constants';
-import {utfDecodeStringWithRanges} from 'react-devtools-shared/src/utils';
+import {
+  parseElementDisplayNameFromBackend,
+  utfDecodeStringWithRanges,
+} from 'react-devtools-shared/src/utils';
 import {ElementTypeRoot} from 'react-devtools-shared/src/frontend/types';
 import ProfilerStore from 'react-devtools-shared/src/devtools/ProfilerStore';
 
@@ -133,6 +136,7 @@ function recursivelyInitializeTree(
         id,
       ): any): number),
       type: node.type,
+      compiledWithForget: node.compiledWithForget,
     });
 
     node.children.forEach(childID =>
@@ -214,6 +218,7 @@ function updateTree(
             parentID: 0,
             treeBaseDuration: 0, // This will be updated by a subsequent operation
             type,
+            compiledWithForget: false,
           };
 
           nodes.set(id, node);
@@ -241,15 +246,19 @@ function updateTree(
           const parentNode = getClonedNode(parentID);
           parentNode.children = parentNode.children.concat(id);
 
+          const {formattedDisplayName, hocDisplayNames, compiledWithForget} =
+            parseElementDisplayNameFromBackend(displayName, type);
+
           const node: CommitTreeNode = {
             children: [],
-            displayName,
-            hocDisplayNames: null,
+            displayName: formattedDisplayName,
+            hocDisplayNames: hocDisplayNames,
             id,
             key,
             parentID,
             treeBaseDuration: 0, // This will be updated by a subsequent operation
             type,
+            compiledWithForget,
           };
 
           nodes.set(id, node);

packages/react-devtools-shared/src/devtools/views/Profiler/FlamegraphChartBuilder.js

@@ -75,8 +75,14 @@ export function getChartData({
       throw Error(`Could not find node with id "${id}" in commit tree`);
     }
 
-    const {children, displayName, hocDisplayNames, key, treeBaseDuration} =
-      node;
+    const {
+      children,
+      displayName,
+      hocDisplayNames,
+      key,
+      treeBaseDuration,
+      compiledWithForget,
+    } = node;
 
     const actualDuration = fiberActualDurations.get(id) || 0;
     const selfDuration = fiberSelfDurations.get(id) || 0;
@@ -86,11 +92,13 @@ export function getChartData({
     const maybeKey = key !== null ? ` key="${key}"` : '';
 
     let maybeBadge = '';
+    const maybeForgetBadge = compiledWithForget ? '✨ ' : '';
+
     if (hocDisplayNames !== null && hocDisplayNames.length > 0) {
       maybeBadge = ` (${hocDisplayNames[0]})`;
     }
 
-    let label = `${name}${maybeBadge}${maybeKey}`;
+    let label = `${maybeForgetBadge}${name}${maybeBadge}${maybeKey}`;
     if (didRender) {
       label += ` (${formatDuration(selfDuration)}ms of ${formatDuration(
         actualDuration,

packages/react-devtools-shared/src/devtools/views/Profiler/HoveredFiberInfo.css

@@ -1,9 +1,19 @@
 .Toolbar {
   padding: 0.25rem 0;
-  margin-bottom: 0.25rem;
   flex: 0 0 auto;
   display: flex;
-  align-items: center;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.BadgesContainer {
+  display: flex;
+  flex-direction: column;
+  gap: 0.25rem;
+}
+
+.BadgesContainer:not(:empty) {
+  padding-bottom: 0.25rem;
   border-bottom: 1px solid var(--color-border);
 }
 
@@ -20,10 +30,11 @@
   white-space: nowrap;
   overflow-x: hidden;
   text-overflow: ellipsis;
+  padding-bottom: 0.25rem;
+  border-bottom: 1px solid var(--color-border);
 }
 
 .CurrentCommit {
-  margin: 0.25rem 0;
   display: block;
   width: 100%;
   text-align: left;

packages/react-devtools-shared/src/devtools/views/Profiler/HoveredFiberInfo.js

@@ -9,6 +9,8 @@
 
 import * as React from 'react';
 import {Fragment, useContext} from 'react';
+
+import InspectedElementBadges from '../Components/InspectedElementBadges';
 import {ProfilerContext} from './ProfilerContext';
 import {formatDuration} from './utils';
 import WhatChanged from './WhatChanged';
@@ -34,11 +36,21 @@ export default function HoveredFiberInfo({fiberData}: Props): React.Node {
   const {id, name} = fiberData;
   const {profilingCache} = profilerStore;
 
+  if (rootID === null || selectedCommitIndex === null) {
+    return null;
+  }
+
   const commitIndices = profilingCache.getFiberCommits({
-    fiberID: ((id: any): number),
-    rootID: ((rootID: any): number),
+    fiberID: id,
+    rootID,
   });
 
+  const {nodes} = profilingCache.getCommitTree({
+    rootID,
+    commitIndex: selectedCommitIndex,
+  });
+  const node = nodes.get(id);
+
   let renderDurationInfo = null;
   let i = 0;
   for (i = 0; i < commitIndices.length; i++) {
@@ -51,7 +63,8 @@ export default function HoveredFiberInfo({fiberData}: Props): React.Node {
 
       renderDurationInfo = (
         <div key={commitIndex} className={styles.CurrentCommit}>
-          {formatDuration(selfDuration)}ms of {formatDuration(actualDuration)}ms
+          <strong>Duration:</strong> {formatDuration(selfDuration)}ms of{' '}
+          {formatDuration(actualDuration)}ms
         </div>
       );
 
@@ -63,10 +76,27 @@ export default function HoveredFiberInfo({fiberData}: Props): React.Node {
     <Fragment>
       <div className={styles.Toolbar}>
         <div className={styles.Component}>{name}</div>
-      </div>
-      <div className={styles.Content}>
-        {renderDurationInfo || <div>Did not render.</div>}
-        <WhatChanged fiberID={((id: any): number)} />
+
+        {node != null && (
+          <div className={styles.BadgesContainer}>
+            <InspectedElementBadges
+              hocDisplayNames={node.hocDisplayNames}
+              compiledWithForget={node.compiledWithForget}
+            />
+
+            {node.compiledWithForget && (
+              <div>
+                ✨ This component has been auto-memoized by the React Compiler.
+              </div>
+            )}
+          </div>
+        )}
+
+        <div className={styles.Content}>
+          {renderDurationInfo || <div>Did not render.</div>}
+
+          <WhatChanged fiberID={id} />
+        </div>
       </div>
     </Fragment>
   );