Merge pull request #25236 from storybookjs/shilman/kill-stories-json

API: Remove stories.json support

MIGRATION.md

@@ -12,6 +12,7 @@
     - [Icons is deprecated](#icons-is-deprecated)
     - [React-docgen component analysis by default](#react-docgen-component-analysis-by-default)
     - [Removed postinstall](#removed-postinstall)
+    - [Removed stories.json](#removed-storiesjson)
   - [Framework-specific changes](#framework-specific-changes)
     - [Angular: Drop support for Angular \< 15](#angular-drop-support-for-angular--15)
     - [Next.js: Drop support for version \< 13.5](#nextjs-drop-support-for-version--135)
@@ -473,6 +474,12 @@ For more information see: https://storybook.js.org/docs/react/api/main-config-ty
 
 We removed the `@storybook/postinstall` package, which provided some utilities for addons to programmatically modify user configuration files on install. This package was years out of date, so this should be a non-disruptive change. If your addon used the package, you can view the old source code [here](https://github.com/storybookjs/storybook/tree/release-7-5/code/lib/postinstall) and adapt it into your addon.
 
+#### Removed stories.json
+
+In addition to the built storybook, `storybook build` generates two files, `index.json` and `stories.json`, that list out the contents of the Storybook. `stories.json` is a legacy format and we included it for backwards compatibility. As of 8.0 we no longer build `stories.json` by default, and we will remove it completely in 9.0.
+
+In the meantime if you have code that relies on `stories.json`, you can find code that transforms the "v4" `index.json` to the "v3" `stories.json` format (and their respective TS types): https://github.com/storybookjs/storybook/blob/release-7-5/code/lib/core-server/src/utils/stories-json.ts#L71-L91
+
 ### Framework-specific changes
 
 #### Angular: Drop support for Angular \< 15

code/lib/core-server/src/build-static.ts

@@ -22,7 +22,7 @@ import {
   copyAllStaticFilesRelativeToMain,
 } from './utils/copy-all-static-files';
 import { getBuilders } from './utils/get-builders';
-import { convertToIndexV3, extractStoriesJson } from './utils/stories-json';
+import { extractStoriesJson } from './utils/stories-json';
 import { extractStorybookMetadata } from './utils/metadata';
 import { StoryIndexGenerator } from './utils/StoryIndexGenerator';
 import { summarizeIndex } from './utils/summarizeIndex';
@@ -172,19 +172,11 @@ export async function buildStaticStandalone(options: BuildStaticStandaloneOption
       storyIndexers: deprecatedStoryIndexers,
       indexers,
       docs: docsOptions,
-      storiesV2Compatibility: !features?.storyStoreV7,
       storyStoreV7: !!features?.storyStoreV7,
       build,
     });
 
     initializedStoryIndexGenerator = generator.initialize().then(() => generator);
-    effects.push(
-      extractStoriesJson(
-        join(options.outputDir, 'stories.json'),
-        initializedStoryIndexGenerator as Promise<StoryIndexGenerator>,
-        convertToIndexV3
-      )
-    );
     effects.push(
       extractStoriesJson(
         join(options.outputDir, 'index.json'),