Release: Prerelease 10.3.0-alpha.9

.github/copilot-instructions.md

@@ -9,7 +9,7 @@ Storybook is a large monorepo built with TypeScript, React, and various other fr
 ## System Requirements
 
 - **Node.js**: 22.21.1 (see `.nvmrc`)
-- **Package Manager**: Yarn 4.9.1
+- **Package Manager**: Yarn 4.10.3
 - **Operating System**: Linux/macOS (CI environment)
 
 ## Repository Structure

CHANGELOG.prerelease.md

@@ -1,3 +1,7 @@
+## 10.3.0-alpha.9
+
+- React: Add react-docgen-typescript to component manifest - [#33818](https://github.com/storybookjs/storybook/pull/33818), thanks @kasperpeulen!
+
 ## 10.3.0-alpha.8
 
 - A11y: Ensure popover dialogs have an ARIA label - [#33500](https://github.com/storybookjs/storybook/pull/33500), thanks @gayanMatch!

code/core/src/core-server/utils/manifests/render-components-manifest.ts

@@ -2,6 +2,8 @@ import path from 'node:path';
 
 import { groupBy } from 'storybook/internal/common';
 
+import type { ComponentDoc, PropItem } from 'react-docgen-typescript';
+
 import type { ComponentManifest, ComponentsManifest } from '../../../types';
 
 /** Minimal docs entry type for rendering in the manifest debugger */
@@ -56,6 +58,9 @@ export function renderComponentsManifest(
     docsWithError: unattachedDocsWithError + attachedDocsWithError,
   };
 
+  const activeEngine = manifest?.meta?.docgen ?? 'react-docgen';
+  const durationMs = manifest?.meta?.durationMs ?? 0;
+
   // Top filters (clickable), no <b> tags; 1px active ring lives in CSS via :target
   const allPill = `<a class="filter-pill all" data-k="all" href="#filter-all">All</a>`;
   const compErrorsPill =
@@ -695,6 +700,28 @@ export function renderComponentsManifest(
 </header>
 <main>
   <div class="wrap">
+    ${
+      activeEngine === 'react-docgen'
+        ? `<div class="note info" style="margin-bottom: 16px;">
+            <strong>Tip:</strong> You are using <code>react-docgen</code> (the default). Generation took <strong>${(durationMs / 1000).toFixed(1)}s</strong>. For higher quality prop types, consider switching to <code>react-docgen-typescript</code> in your <code>main.ts</code>:
+            <pre><code>typescript: {
+  reactDocgen: 'react-docgen-typescript',
+}</code></pre>
+            Note: <code>react-docgen-typescript</code> can be slower. If performance is acceptable for your project, it generally produces better results.
+            <a href="https://storybook.js.org/docs/api/main-config/main-config-typescript#reactdocgen" target="_blank">Learn more</a>
+          </div>`
+        : activeEngine === 'react-docgen-typescript' && durationMs > 7500
+          ? `<div class="note err" style="margin-bottom: 16px;">
+              <strong>Performance warning:</strong> <code>react-docgen-typescript</code> took <strong>${(durationMs / 1000).toFixed(1)}s</strong> to generate the manifest. This delay applies every time the manifest is used by an agent. Consider switching to the faster <code>react-docgen</code> in your <code>main.ts</code>:
+              <pre><code>typescript: {
+  reactDocgen: 'react-docgen',
+}</code></pre>
+              <a href="https://storybook.js.org/docs/api/main-config/main-config-typescript#reactdocgen" target="_blank">Learn more</a>
+            </div>`
+          : `<div class="note ok" style="margin-bottom: 16px;">
+              Using <code>${activeEngine}</code>. Generation took <strong>${(durationMs / 1000).toFixed(1)}s</strong>.
+            </div>`
+    }
     ${
       grid
         ? `<h2 class="section-title">Components</h2>
@@ -887,10 +914,27 @@ function renderComponentCard(key: string, c: ComponentManifestWithDocs, id: stri
       ? `<label for="${slug}-docs" class="badge ${a.docsErrors > 0 ? 'err' : 'ok'} as-toggle">${a.docsErrors > 0 ? `${a.docsErrors}/${a.totalDocs} doc errors` : `${a.totalDocs} ${plural(a.totalDocs, 'doc')}`}</label>`
       : '';
 
-  // When there is no prop type error, try to read prop types from reactDocgen if present
-  const reactDocgen: any = !a.hasPropTypeError && 'reactDocgen' in c && c.reactDocgen;
+  // Determine which docgen engine produced results (they are now mutually exclusive)
+  const reactDocgen =
+    !a.hasPropTypeError && 'reactDocgen' in c ? (c.reactDocgen as DocgenDoc) : undefined;
+  const reactDocgenTypescriptData =
+    !a.hasPropTypeError && 'reactDocgenTypescript' in c
+      ? (c.reactDocgenTypescript as RdtComponentDoc)
+      : undefined;
+
   const parsedDocgen = reactDocgen ? parseReactDocgen(reactDocgen) : undefined;
-  const propEntries = parsedDocgen ? Object.entries(parsedDocgen.props ?? {}) : [];
+  const parsedReactDocgenTypescript = reactDocgenTypescriptData
+    ? parseReactDocgenTypescript(reactDocgenTypescriptData)
+    : undefined;
+
+  // Use whichever engine is active
+  const activeParsed = parsedDocgen ?? parsedReactDocgenTypescript;
+  const cardEngine = parsedDocgen
+    ? 'react-docgen'
+    : parsedReactDocgenTypescript
+      ? 'react-docgen-typescript'
+      : '';
+  const propEntries = activeParsed ? Object.entries(activeParsed.props ?? {}) : [];
   const propTypesBadge =
     !a.hasPropTypeError && propEntries.length > 0
       ? `<label for="${slug}-props" class="badge ok as-toggle">${propEntries.length} ${plural(propEntries.length, 'prop type')}</label>`
@@ -927,7 +971,6 @@ function renderComponentCard(key: string, c: ComponentManifestWithDocs, id: stri
           .join('')
       : '';
 
-  esc(c.error?.message || 'Unknown error');
   return `
 <article
   class="card 
@@ -983,10 +1026,22 @@ function renderComponentCard(key: string, c: ComponentManifestWithDocs, id: stri
         <div class="panel panel-props">
           <div class="note ok">
             <div class="row">
-              <span class="ex-name">Prop types</span>
+              <span class="ex-name">Prop types <small>(${cardEngine})</small></span>
               <span class="badge ok">${propEntries.length} ${plural(propEntries.length, 'prop type')}</span>
             </div>
-            <pre><code>Component: ${reactDocgen?.definedInFile ? esc(path.relative(process.cwd(), reactDocgen.definedInFile)) : ''}${reactDocgen?.exportName ? '::' + esc(reactDocgen?.exportName) : ''}</code></pre>
+            <pre><code>Component: ${
+              reactDocgen?.definedInFile
+                ? esc(path.relative(process.cwd(), reactDocgen.definedInFile))
+                : reactDocgenTypescriptData?.filePath
+                  ? esc(path.relative(process.cwd(), reactDocgenTypescriptData.filePath))
+                  : ''
+            }${
+              reactDocgen?.exportName
+                ? '::' + esc(reactDocgen.exportName)
+                : reactDocgenTypescriptData?.exportName
+                  ? '::' + esc(reactDocgenTypescriptData.exportName)
+                  : ''
+            }</code></pre>
             <pre><code>Props:</code></pre>
             <pre><code>${esc(propsCode)}</code></pre>
           </div>
@@ -1081,20 +1136,70 @@ function renderComponentCard(key: string, c: ComponentManifestWithDocs, id: stri
 </article>`;
 }
 
+type ParsedProp = {
+  description?: string;
+  type?: string;
+  defaultValue?: string;
+  required?: boolean;
+};
+
 type ParsedDocgen = {
-  props: Record<
-    string,
-    {
-      description?: string;
-      type?: string;
-      defaultValue?: string;
-      required?: boolean;
-    }
-  >;
+  props: Record<string, ParsedProp>;
+};
+
+type RdtComponentDoc = ComponentDoc & { exportName?: string };
+
+const parseReactDocgenTypescript = (reactDocgenTypescript: RdtComponentDoc): ParsedDocgen => {
+  const props: Record<string, PropItem> = reactDocgenTypescript.props ?? {};
+  return {
+    props: Object.fromEntries(
+      Object.entries(props).map(([propName, prop]) => [
+        propName,
+        {
+          description: prop.description,
+          // RDT uses prop.type.name as a flat string (e.g. "() => void", "{ id: string }")
+          // For enums, prefer prop.type.raw which has the full union
+          type: prop.type?.raw ?? prop.type?.name,
+          defaultValue: prop.defaultValue?.value,
+          required: prop.required,
+        },
+      ])
+    ),
+  };
 };
 
-const parseReactDocgen = (reactDocgen: any): ParsedDocgen => {
-  const props: Record<string, any> = (reactDocgen as any)?.props ?? {};
+/** Shape of a react-docgen tsType node (recursive) */
+interface DocgenTsType {
+  name?: string;
+  raw?: string;
+  value?: string;
+  elements?: DocgenTsType[];
+  type?: string;
+  signature?: {
+    arguments?: { name: string; type?: DocgenTsType }[];
+    return?: DocgenTsType;
+    properties?: { key: string; value?: DocgenTsType & { required?: boolean } }[];
+  };
+}
+
+/** Shape of a single prop from react-docgen's Documentation.props */
+interface DocgenPropItem {
+  description?: string;
+  tsType?: DocgenTsType;
+  type?: DocgenTsType;
+  defaultValue?: { value?: string } | null;
+  required?: boolean;
+}
+
+/** Shape of react-docgen's Documentation (only fields we read) */
+interface DocgenDoc {
+  props?: Record<string, DocgenPropItem>;
+  definedInFile?: string;
+  exportName?: string;
+}
+
+const parseReactDocgen = (reactDocgen: DocgenDoc): ParsedDocgen => {
+  const props = reactDocgen.props ?? {};
   return {
     props: Object.fromEntries(
       Object.entries(props).map(([propName, prop]) => [
@@ -1111,54 +1216,53 @@ const parseReactDocgen = (reactDocgen: any): ParsedDocgen => {
 };
 
 // Serialize a react-docgen tsType into a TypeScript-like string when raw is not available
-function serializeTsType(tsType: any): string | undefined {
+function serializeTsType(tsType: DocgenTsType | undefined): string | undefined {
   if (!tsType) {
     return undefined;
   }
   // Prefer raw if provided
-  // Prefer raw if provided
-  if ('raw' in tsType && typeof tsType.raw === 'string' && tsType.raw.trim().length > 0) {
+  if (tsType.raw && tsType.raw.trim().length > 0) {
     return tsType.raw;
   }
 
   if (!tsType.name) {
     return undefined;
   }
 
-  if ('elements' in tsType) {
+  if (tsType.elements) {
     if (tsType.name === 'union') {
-      const parts = (tsType.elements ?? []).map((el: any) => serializeTsType(el) ?? 'unknown');
+      const parts = tsType.elements.map((el) => serializeTsType(el) ?? 'unknown');
       return parts.join(' | ');
     }
     if (tsType.name === 'intersection') {
-      const parts = (tsType.elements ?? []).map((el: any) => serializeTsType(el) ?? 'unknown');
+      const parts = tsType.elements.map((el) => serializeTsType(el) ?? 'unknown');
       return parts.join(' & ');
     }
     if (tsType.name === 'Array') {
       // Prefer raw earlier; here build fallback
-      const el = (tsType.elements ?? [])[0];
+      const el = tsType.elements[0];
       const inner = serializeTsType(el) ?? 'unknown';
       return `${inner}[]`;
     }
     if (tsType.name === 'tuple') {
-      const parts = (tsType.elements ?? []).map((el: any) => serializeTsType(el) ?? 'unknown');
+      const parts = tsType.elements.map((el) => serializeTsType(el) ?? 'unknown');
       return `[${parts.join(', ')}]`;
     }
   }
-  if ('value' in tsType && tsType.name === 'literal') {
+  if (tsType.value && tsType.name === 'literal') {
     return tsType.value;
   }
-  if ('signature' in tsType && tsType.name === 'signature') {
+  if (tsType.signature && tsType.name === 'signature') {
     if (tsType.type === 'function') {
-      const args = (tsType.signature?.arguments ?? []).map((a: any) => {
+      const args = (tsType.signature.arguments ?? []).map((a) => {
         const argType = serializeTsType(a.type) ?? 'any';
         return `${a.name}: ${argType}`;
       });
-      const ret = serializeTsType(tsType.signature?.return) ?? 'void';
+      const ret = serializeTsType(tsType.signature.return) ?? 'void';
       return `(${args.join(', ')}) => ${ret}`;
     }
     if (tsType.type === 'object') {
-      const props = (tsType.signature?.properties ?? []).map((p: any) => {
+      const props = (tsType.signature.properties ?? []).map((p) => {
         const req: boolean = Boolean(p.value?.required);
         const propType = serializeTsType(p.value) ?? 'any';
         return `${p.key}${req ? '' : '?'}: ${propType}`;
@@ -1168,8 +1272,8 @@ function serializeTsType(tsType: any): string | undefined {
     return 'unknown';
   }
   // Default case (Generic like Item<TMeta>)
-  if ('elements' in tsType) {
-    const inner = (tsType.elements ?? []).map((el: any) => serializeTsType(el) ?? 'unknown');
+  if (tsType.elements) {
+    const inner = tsType.elements.map((el) => serializeTsType(el) ?? 'unknown');
 
     if (inner.length > 0) {
       return `${tsType.name}<${inner.join(', ')}>`;

code/core/src/types/modules/core-common.ts

@@ -369,6 +369,10 @@ export interface ComponentManifest {
 export interface ComponentsManifest {
   v: number;
   components: Record<string, ComponentManifest>;
+  meta?: {
+    docgen: 'react-docgen' | 'react-docgen-typescript';
+    durationMs: number;
+  };
 }
 
 type ManifestName = string;

code/e2e-tests/addon-mcp.spec.ts

@@ -134,10 +134,6 @@ test.describe('addon-mcp', () => {
       test('should show both toolsets as enabled', async ({ page }) => {
         await page.goto(MCP_ENDPOINT);
 
-        // Both toolsets should show as enabled
-        const enabledStatuses = page.locator('.toolset-status.enabled');
-        await expect(enabledStatuses).toHaveCount(2);
-
         // Check that dev toolset is listed with its tools
         const devToolset = page.locator('.toolset', { has: page.locator('text=dev') });
         await expect(devToolset).toBeVisible();
@@ -147,6 +143,18 @@ test.describe('addon-mcp', () => {
         const docsToolset = page.locator('.toolset', { has: page.locator('text=docs') });
         await expect(docsToolset).toBeVisible();
         await expect(docsToolset.locator('.toolset-status')).toHaveText('enabled');
+
+        // Check that test toolset is listed with its tools
+        const testToolset = page.locator('.toolset', { has: page.locator('text=test') });
+        await expect(testToolset).toBeVisible();
+        await expect(testToolset.locator('.toolset-status').first()).toHaveText('enabled');
+
+        // Check that accessibility tool is enabled
+        const accessibilityTool = testToolset.locator(
+          '.toolset-tools li:has-text("accessibility")'
+        );
+        await expect(accessibilityTool).toBeVisible();
+        await expect(accessibilityTool.locator('.toolset-status')).toHaveText('+ accessibility');
       });
     });
 

code/e2e-tests/preview-api.spec.ts

@@ -55,7 +55,8 @@ test.describe('preview-api', () => {
   });
 
   // if rerenders were interleaved the button would have rendered "Error: Interleaved loaders. Changed arg"
-  test('should only render once at a time when rapidly changing args', async ({ page }) => {
+  // TODO: ENABLE again once the flake is fixed
+  test.skip('should only render once at a time when rapidly changing args', async ({ page }) => {
     const sbPage = new SbPage(page, expect);
     await sbPage.navigateToStory('core/rendering', 'slow-loader');
 

code/package.json

@@ -220,5 +220,6 @@
         "Dependency Upgrades"
       ]
     ]
-  }
+  },
+  "deferredNextVersion": "10.3.0-alpha.9"
 }

code/renderers/react/package.json

@@ -54,7 +54,8 @@
   "dependencies": {
     "@storybook/global": "^5.0.0",
     "@storybook/react-dom-shim": "workspace:*",
-    "react-docgen": "^8.0.2"
+    "react-docgen": "^8.0.2",
+    "react-docgen-typescript": "^2.2.2"
   },
   "devDependencies": {
     "@types/babel-plugin-react-docgen": "^4.2.3",

code/renderers/react/src/componentManifest/__testfixtures__/Arrow.ts

@@ -0,0 +1,4 @@
+interface CardProps {
+  title: string;
+}
+export const Card = (props: CardProps) => null;

code/renderers/react/src/componentManifest/__testfixtures__/Button.ts

@@ -0,0 +1,7 @@
+interface ButtonProps {
+  label: string;
+  disabled?: boolean;
+}
+export function Button(props: ButtonProps) {
+  return null;
+}

code/renderers/react/src/componentManifest/__testfixtures__/DefaultExport.ts

@@ -0,0 +1,8 @@
+interface IconProps {
+  name: string;
+  size?: number;
+}
+function Icon(props: IconProps) {
+  return null;
+}
+export default Icon;

code/renderers/react/src/componentManifest/__testfixtures__/DefaultValues.ts

@@ -0,0 +1,7 @@
+interface AlertProps {
+  message: string;
+  severity?: string;
+}
+export function Alert({ message, severity = 'info' }: AlertProps) {
+  return null;
+}