Add stylex metadata to new plugins field

And display it separately in DevTools, as read-only (for now)

packages/react-devtools-shared/src/backend/StyleX/__tests__/utils-test.js

@@ -8,7 +8,7 @@
  */
 
 describe('Stylex plugin utils', () => {
-  let getStyleXValues;
+  let getStyleXData;
   let styleElements;
 
   function defineStyles(style) {
@@ -22,7 +22,7 @@ describe('Stylex plugin utils', () => {
   }
 
   beforeEach(() => {
-    getStyleXValues = require('../utils').getStyleXValues;
+    getStyleXData = require('../utils').getStyleXData;
 
     styleElements = [];
   });
@@ -47,16 +47,25 @@ describe('Stylex plugin utils', () => {
     `);
 
     expect(
-      getStyleXValues({
+      getStyleXData({
+        // The source/module styles are defined in
+        Example__style: 'Example__style',
+
+        // Map of CSS style to StyleX class name, booleans, or nested structures
         display: 'foo',
         flexDirection: 'baz',
         alignItems: 'bar',
       }),
     ).toMatchInlineSnapshot(`
       Object {
-        "alignItems": "center",
-        "display": "flex",
-        "flexDirection": "center",
+        "resolvedStyles": Object {
+          "alignItems": "center",
+          "display": "flex",
+          "flexDirection": "center",
+        },
+        "sources": Array [
+          "Example__style",
+        ],
       }
     `);
   });
@@ -75,15 +84,25 @@ describe('Stylex plugin utils', () => {
     `);
 
     expect(
-      getStyleXValues([
-        {display: 'foo'},
-        {flexDirection: 'baz', alignItems: 'bar'},
+      getStyleXData([
+        {Example1__style: 'Example1__style', display: 'foo'},
+        {
+          Example2__style: 'Example2__style',
+          flexDirection: 'baz',
+          alignItems: 'bar',
+        },
       ]),
     ).toMatchInlineSnapshot(`
       Object {
-        "alignItems": "center",
-        "display": "flex",
-        "flexDirection": "center",
+        "resolvedStyles": Object {
+          "alignItems": "center",
+          "display": "flex",
+          "flexDirection": "center",
+        },
+        "sources": Array [
+          "Example1__style",
+          "Example2__style",
+        ],
       }
     `);
   });
@@ -102,19 +121,29 @@ describe('Stylex plugin utils', () => {
     `);
 
     expect(
-      getStyleXValues([
+      getStyleXData([
         false,
-        {display: 'foo'},
+        {Example1__style: 'Example1__style', display: 'foo'},
         false,
         false,
-        {flexDirection: 'baz', alignItems: 'bar'},
+        {
+          Example2__style: 'Example2__style',
+          flexDirection: 'baz',
+          alignItems: 'bar',
+        },
         false,
       ]),
     ).toMatchInlineSnapshot(`
       Object {
-        "alignItems": "center",
-        "display": "flex",
-        "flexDirection": "center",
+        "resolvedStyles": Object {
+          "alignItems": "center",
+          "display": "flex",
+          "flexDirection": "center",
+        },
+        "sources": Array [
+          "Example1__style",
+          "Example2__style",
+        ],
       }
     `);
   });
@@ -133,7 +162,11 @@ describe('Stylex plugin utils', () => {
     `);
 
     expect(
-      getStyleXValues({
+      getStyleXData({
+        // The source/module styles are defined in
+        Example__style: 'Example__style',
+
+        // Map of CSS style to StyleX class name, booleans, or nested structures
         color: 'foo',
         ':hover': {
           color: 'bar',
@@ -142,11 +175,16 @@ describe('Stylex plugin utils', () => {
       }),
     ).toMatchInlineSnapshot(`
       Object {
-        ":hover": Object {
-          "color": "blue",
-          "textDecoration": "none",
+        "resolvedStyles": Object {
+          ":hover": Object {
+            "color": "blue",
+            "textDecoration": "none",
+          },
+          "color": "black",
         },
-        "color": "black",
+        "sources": Array [
+          "Example__style",
+        ],
       }
     `);
   });
@@ -165,17 +203,28 @@ describe('Stylex plugin utils', () => {
     `);
 
     expect(
-      getStyleXValues([
-        {display: 'foo'},
+      getStyleXData([
+        {Example1__style: 'Example1__style', display: 'foo'},
         false,
-        [false, {flexDirection: 'baz'}, {alignItems: 'bar'}],
+        [
+          false,
+          {Example2__style: 'Example2__style', flexDirection: 'baz'},
+          {Example3__style: 'Example3__style', alignItems: 'bar'},
+        ],
         false,
       ]),
     ).toMatchInlineSnapshot(`
       Object {
-        "alignItems": "center",
-        "display": "flex",
-        "flexDirection": "center",
+        "resolvedStyles": Object {
+          "alignItems": "center",
+          "display": "flex",
+          "flexDirection": "center",
+        },
+        "sources": Array [
+          "Example1__style",
+          "Example2__style",
+          "Example3__style",
+        ],
       }
     `);
   });

packages/react-devtools-shared/src/backend/StyleX/utils.js

@@ -7,34 +7,66 @@
  * @flow
  */
 
+export type StyleXData = {|
+  sources: Array<string>,
+  resolvedStyles: Object,
+|};
+
 const cachedStyleNameToValueMap: Map<string, string> = new Map();
 
-export function getStyleXValues(data: any, mappedStyles: Object = {}) {
+export function getStyleXData(data: any): StyleXData {
+  const sources = new Set();
+  const resolvedStyles = {};
+
+  crawlData(data, sources, resolvedStyles);
+
+  return {
+    sources: Array.from(sources).sort(),
+    resolvedStyles,
+  };
+}
+
+export function crawlData(
+  data: any,
+  sources: Set<string>,
+  resolvedStyles: Object,
+): void {
   if (Array.isArray(data)) {
     data.forEach(entry => {
       if (Array.isArray(entry)) {
-        getStyleXValues(entry, mappedStyles);
+        crawlData(entry, sources, resolvedStyles);
       } else {
-        crawlObjectProperties(entry, mappedStyles);
+        crawlObjectProperties(entry, sources, resolvedStyles);
       }
     });
   } else {
-    crawlObjectProperties(data, mappedStyles);
+    crawlObjectProperties(data, sources, resolvedStyles);
   }
 
-  return Object.fromEntries<string, any>(Object.entries(mappedStyles).sort());
+  resolvedStyles = Object.fromEntries<string, any>(
+    Object.entries(resolvedStyles).sort(),
+  );
 }
 
-function crawlObjectProperties(entry: Object, mappedStyles: Object) {
+function crawlObjectProperties(
+  entry: Object,
+  sources: Set<string>,
+  resolvedStyles: Object,
+): void {
   const keys = Object.keys(entry);
   keys.forEach(key => {
     const value = entry[key];
     if (typeof value === 'string') {
-      mappedStyles[key] = getPropertyValueForStyleName(value);
+      if (key === value) {
+        // Special case; this key is the name of the style's source/file/module.
+        sources.add(key);
+      } else {
+        resolvedStyles[key] = getPropertyValueForStyleName(value);
+      }
     } else {
       const nestedStyle = {};
-      mappedStyles[key] = nestedStyle;
-      getStyleXValues([value], nestedStyle);
+      resolvedStyles[key] = nestedStyle;
+      crawlData([value], sources, nestedStyle);
     }
   });
 }

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

@@ -838,6 +838,8 @@ export function attach(
       rootType: null,
       rendererPackageName: null,
       rendererVersion: null,
+
+      plugins: [],
     };
   }
 

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

@@ -89,7 +89,7 @@ import {
 import is from 'shared/objectIs';
 import isArray from 'shared/isArray';
 import hasOwnProperty from 'shared/hasOwnProperty';
-import {getStyleXValues} from './StyleX/utils';
+import {getStyleXData} from './StyleX/utils';
 
 import type {Fiber} from 'react-reconciler/src/ReactInternalTypes';
 import type {
@@ -102,6 +102,7 @@ import type {
   NativeType,
   PathFrame,
   PathMatch,
+  Plugin,
   ProfilingDataBackend,
   ProfilingDataForRootBackend,
   ReactRenderer,
@@ -3238,12 +3239,14 @@ export function attach(
       targetErrorBoundaryID = getNearestErrorBoundaryID(fiber);
     }
 
-    const modifiedProps = {
-      ...memoizedProps,
-    };
+    const plugins: Array<Plugin> = [];
+
     if (enableStyleXFeatures) {
-      if (modifiedProps.hasOwnProperty('xstyle')) {
-        modifiedProps.xstyle = getStyleXValues(modifiedProps.xstyle);
+      if (memoizedProps.hasOwnProperty('xstyle')) {
+        plugins.push({
+          type: 'stylex',
+          data: getStyleXData(memoizedProps.xstyle),
+        });
       }
     }
 
@@ -3292,7 +3295,7 @@ export function attach(
       // TODO Review sanitization approach for the below inspectable values.
       context,
       hooks,
-      props: modifiedProps,
+      props: memoizedProps,
       state: showState ? memoizedState : null,
       errors: Array.from(errors.entries()),
       warnings: Array.from(warnings.entries()),
@@ -3306,6 +3309,8 @@ export function attach(
       rootType,
       rendererPackageName: renderer.rendererPackageName,
       rendererVersion: renderer.version,
+
+      plugins,
     };
   }
 

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

@@ -213,6 +213,14 @@ export type OwnersList = {|
   owners: Array<SerializedElement> | null,
 |};
 
+// For now, let's only support a hard-coded set of plugins.
+type PluginType = 'stylex';
+
+export type Plugin = {
+  type: PluginType,
+  data: any,
+};
+
 export type InspectedElement = {|
   id: number,
 
@@ -265,6 +273,9 @@ export type InspectedElement = {|
   // Meta information about the renderer that created this element.
   rendererPackageName: string | null,
   rendererVersion: string | null,
+
+  // Array of UI plugins/visualizations for the inspected element.
+  plugins: Array<Plugin>,
 |};
 
 export const InspectElementErrorType = 'error';

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

@@ -208,6 +208,7 @@ export function convertInspectedElementBackendToFrontend(
     owners,
     context,
     hooks,
+    plugins,
     props,
     rendererPackageName,
     rendererVersion,
@@ -233,6 +234,7 @@ export function convertInspectedElementBackendToFrontend(
     hasLegacyContext,
     id,
     key,
+    plugins,
     rendererPackageName,
     rendererVersion,
     rootType,

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

@@ -0,0 +1,6 @@
+.Source {
+  color: var(--color-dim);
+  margin-left: 1rem;
+  overflow: auto;
+  text-overflow: ellipsis;
+}