ManagerAPI: Fix bug with story redirection when URL has partial storyId

code/e2e-tests/navigation.spec.ts

@@ -0,0 +1,18 @@
+import { test, expect } from '@playwright/test';
+import process from 'process';
+import { SbPage } from './util';
+
+const storybookUrl = process.env.STORYBOOK_URL || 'http://localhost:8001';
+
+test.describe('navigating', () => {
+  test('a URL with a partial storyId will redirect to the first story', async ({ page }) => {
+    // this is purposefully not using the SbPage class, and the URL is a partial (it does not contain the full storyId)
+    await page.goto(`${storybookUrl}?path=/story/example-button`);
+
+    const sbPage = new SbPage(page);
+
+    await sbPage.waitUntilLoaded();
+
+    await expect(sbPage.page.url()).toContain('/docs/example-button--docs');
+  });
+});

code/lib/manager-api/src/modules/stories.ts

@@ -637,15 +637,18 @@ export const init: ModuleFn<SubAPI, SubState> = ({
           state.path === '/' || state.viewMode === 'story' || state.viewMode === 'docs';
         const stateHasSelection = state.viewMode && state.storyId;
         const stateSelectionDifferent = state.viewMode !== viewMode || state.storyId !== storyId;
+        const { type } = state.index[state.storyId] || {};
+        const isStory = !(type === 'root' || type === 'component' || type === 'group');
+
         /**
          * When storybook starts, we want to navigate to the first story.
          * But there are a few exceptions:
-         * - If the current storyId and viewMode are already set/correct.
+         * - If the current storyId and viewMode are already set/correct AND the url section is a leaf-type.
          * - If the user has navigated away already.
          * - If the user started storybook with a specific page-URL like "/settings/about"
          */
         if (isCanvasRoute) {
-          if (stateHasSelection && stateSelectionDifferent) {
+          if (stateHasSelection && stateSelectionDifferent && isStory) {
             // The manager state is correct, the preview state is lagging behind
             provider.channel.emit(SET_CURRENT_STORY, {
               storyId: state.storyId,

code/lib/manager-api/src/tests/stories.test.ts

@@ -542,31 +542,35 @@ describe('stories API', () => {
 
   describe('STORY_SPECIFIED event', () => {
     it('navigates to the story', async () => {
-      const moduleArgs = createMockModuleArgs({ initialState: { path: '/' } });
+      const moduleArgs = createMockModuleArgs({ initialState: { path: '/', index: {} } });
       initStories(moduleArgs as unknown as ModuleArgs);
       const { navigate, provider } = moduleArgs;
 
       provider.channel.emit(STORY_SPECIFIED, { storyId: 'a--1', viewMode: 'story' });
       expect(navigate).toHaveBeenCalledWith('/story/a--1');
     });
     it('DOES not navigate if the story was already selected', async () => {
-      const moduleArgs = createMockModuleArgs({ initialState: { path: '/story/a--1' } });
+      const moduleArgs = createMockModuleArgs({ initialState: { path: '/story/a--1', index: {} } });
       initStories(moduleArgs as unknown as ModuleArgs);
       const { navigate, provider } = moduleArgs;
 
       provider.channel.emit(STORY_SPECIFIED, { storyId: 'a--1', viewMode: 'story' });
       expect(navigate).not.toHaveBeenCalled();
     });
     it('DOES not navigate if a settings page was selected', async () => {
-      const moduleArgs = createMockModuleArgs({ initialState: { path: '/settings/about' } });
+      const moduleArgs = createMockModuleArgs({
+        initialState: { path: '/settings/about', index: {} },
+      });
       initStories(moduleArgs as unknown as ModuleArgs);
       const { navigate, provider } = moduleArgs;
 
       provider.channel.emit(STORY_SPECIFIED, { storyId: 'a--1', viewMode: 'story' });
       expect(navigate).not.toHaveBeenCalled();
     });
     it('DOES not navigate if a custom page was selected', async () => {
-      const moduleArgs = createMockModuleArgs({ initialState: { path: '/custom/page' } });
+      const moduleArgs = createMockModuleArgs({
+        initialState: { path: '/custom/page', index: {} },
+      });
       initStories(moduleArgs as unknown as ModuleArgs);
       const { navigate, provider } = moduleArgs;