Core: Merge stories from all CSF files sharing a component id in story-docs

[MeGaurav4]

Closes #36175

What I did

docs list only reported stories from the winning file when several
CSF files share one component id, even though the UI shows every
file's stories. I wrapped the story-docs provider so a component's
payload merges the stories records from all sibling files sharing
the id. Docgen, props tables, and the manifest keep the single-file
rule from #35931, and on story-id collisions the winning file wins.
Sibling extractions run settled so one failing file cannot discard
the winner's stories.

Checklist for Contributors

Testing

• unit tests (server.test.ts: merge across files, winner-wins on collision, sibling failure keeps winner)

Manual testing

I could not run the full suite here, so a maintainer should verify
with the repro in the issue (two same-title CSF files, then
storybook tools docs list shows both files' stories). Let me
know if you want e2e coverage added for this.

One known limitation: dev-server hot refresh still keys on the
winning file, so editing a losing file alone will not refresh its
snippets until the next full extract. Happy to follow up on that
separately if you want it covered here.

[github-actions]

	Fails
🚫	PR is not labeled with one of: ["ci:normal","ci:merged","ci:daily","ci:docs"]
🚫	PR is not labeled with one of: ["qa:needed","qa:skip","qa:success"]
🚫	This PR needs an approving review from a Storybook Core or Developer Experience team member before it can be merged.

Generated by 🚫 dangerJS against a1c6407

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📒 Files selected for processing (1)

• code/core/src/shared/open-service/services/story-docs/server.test.ts

🚧 Files skipped from review as they are similar to previous changes (1)

• code/core/src/shared/open-service/services/story-docs/server.test.ts

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---

Walkthrough

The story-docs service now merges stories from eligible CSF files that share a component ID. The winning file retains precedence for duplicate story IDs and identity fields. Failed sibling extractions do not remove successful stories. Tests cover these cases.

Changes

Story-docs sibling merge

Layer / File(s)	Summary
Sibling story merge implementation code/core/src/common/utils/select-component-entry.ts, code/core/src/shared/open-service/services/story-docs/server.ts	isEligibleStoryEntry is exported. The story-docs service finds eligible sibling entries, merges their stories records, preserves the winning file’s metadata, and ignores failed sibling extractions.
Sibling story merge validation code/core/src/shared/open-service/services/story-docs/server.test.ts	Tests cover story merging across sibling files, winning-file precedence, duplicate story IDs, failed sibling extraction, and shared provider setup.

Sequence Diagram(s)

sequenceDiagram
  participant StoryDocsClient
  participant StoryDocsService
  participant StoryIndex
  participant StoryDocsProvider
  StoryDocsClient->>StoryDocsService: request story docs
  StoryDocsService->>StoryDocsProvider: extract winning entry
  StoryDocsService->>StoryIndex: find eligible sibling entries
  StoryDocsService->>StoryDocsProvider: extract sibling stories
  StoryDocsService->>StoryDocsClient: return merged stories

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Merge Risk: ⚪ Minimal · up to a1c64

Docs list now merges same-component stories while preserving winning-file precedence and sibling-failure resilience. No merge-blocking risk remains.

✨ Finishing Touches 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

---

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Actionable comments posted: 1

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Inline comments:
In `@code/core/src/shared/open-service/services/story-docs/server.test.ts`:
- Around line 83-90: In
code/core/src/shared/open-service/services/story-docs/server.test.ts, move the
StoryDocsProvider mock implementations at lines 83-90, 105-112, and 125-135 into
beforeEach setup. Create the provider mock there, configure it through
vi.mocked(provider).mockImplementation(...), and add a nested beforeEach for the
sibling rejection case so each test has isolated mock behavior.

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📒 Files selected for processing (3)

• code/core/src/common/utils/select-component-entry.ts
• code/core/src/shared/open-service/services/story-docs/server.test.ts
• code/core/src/shared/open-service/services/story-docs/server.ts

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[storybook-contribution-review]

🤖 I am the Storybook contribution review bot; a human maintainer approved this message before it was posted.
Review phase: Triage - before the review pipeline

Hi @MeGaurav4,

Due to a recent high volume of unreviewed AI-generated PRs, we are requesting verification and proof that the implemented fix actually works. Please provide one of the following, depending on your change:

• If your change has a visible effect in the UI: a short GIF, video, or screenshot showing the fix, ideally with a before-and-after comparison.
• If your change has no visual output (for example a parser, config, or build-tooling change): paste the terminal output of a test run or a minimal reproduction that shows the behavior before and after your change.

Thank you for your understanding!

[MeGaurav4]

Verification for the fix, since I could not run the repo suite here.

I reproduced the selection plus merge logic standalone with stub index data mirroring the issue (two same-title CSF files collapsing onto one component id), using the exact code paths from select-component-entry.ts and the new withSiblingStoryMerge:

winner file: ./VegaLiteRanges.stories.tsx
BEFORE (current main): vegavegachart--line, vegavegachart--area
AFTER (this PR) : vegavegachart--area, vegavegachart--bar, vegavegachart--default, vegavegachart--line

The winning file keeps precedence, and the previously omitted stories from the other file now appear. The new unit tests in server.test.ts cover the same three cases (merge, collision precedence, sibling failure), and CI runs them.

[storybook-contribution-review]

🤖 I am the Storybook contribution review bot; a human maintainer approved this message before it was posted.
Review phase: Architecture review (stage 1 of 3)

We are trying out something new: a three-stage automated review - architecture, then code quality, then runtime verification - that runs on a PR before a human maintainer looks at it closely. A maintainer still reads this and still makes the call; the aim is that by the time they do, the reachability and evidence work is already done. Tell us how it lands for you, that feedback is genuinely useful to us right now.

Hi @MeGaurav4,

Thank you for taking on #36175. Keeping the winning file authoritative for top-level metadata and story-id collisions is a good fit for the current service contract, and using settled sibling results preserves the winner when another file fails.

I am requesting changes at the architecture gate because the current cross-file merge breaks three service invariants:

1. findSiblingStoryEntries returns story entries, but each StoryDocsProvider call extracts a full CSF file. A component with many stories can parse the same file many times, including the winning file, under an unbounded nested fan-out.
2. The extraction cache and refresh subscription still track only the winning file. As a result, editing a losing file leaves the merged core/story-docs payload stale. The disclosed hot-refresh limitation is therefore a cache correctness issue in this service, not only a follow-up optimization.
3. The sibling scan uses the full story index, while docs list visibility is defined by Tag.MANIFEST. The merge can bring stories that were excluded from the docs manifest back into the output.

A Storybook-aligned revision would:

• add a file-aware helper next to selectComponentEntriesByComponentId that groups eligible entries by canonical component id and de-duplicates them by import path, while leaving the existing one-winner selector unchanged;
• call the composed provider once per distinct contributing CSF file, merge results in deterministic index order, apply the winner last, and filter the result to manifest-visible story ids;
• let the extraction service receive the complete source-path set for story docs, so changes to any contributing file invalidate and refresh the component;
• cover multiple stories per file and provider call count, losing-file refresh, and manifest exclusion, while keeping the collision-precedence and partial-failure cases.

This review stops at stage 1 for head a1c640772304cbffc4a34561c59ba4eeb6e9b5dd; code-quality and runtime-verification stages have not run. Once these ownership and invalidation points are addressed, the PR can re-enter at the architecture gate. The core idea is useful, and the careful winner semantics give the revision a solid base.