test(theme): use raw string serializer for markdown snapshots

[moshams272]

Summary

Improves Developer Experience (DX) by making generated markdown snapshots human-readable.

Details

By default, the node:test snapshot serializes strings by escaping \n. Because of this, the entire markdown output is compressed into a single line. When a snapshot test fails, the resulting line-diff is big and hard to read, looking like this:

By overriding the default serializer with (val) => val, we prevent this escaping behavior. The snapshots are now saved as raw multi-line strings. Now, when a test fails, the diff correctly highlights only the specific lines that changed, looking like this:

Summary by CodeRabbit

• Tests
  • Updated snapshot comparisons to use consistent Markdown serialization.
  • Reformatted expected documentation output for improved readability while preserving the documented content.

[vercel]

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Project	Deployment	Actions	Updated (UTC)
webpack-doc-kit	Ready	Preview	Aug 10, 2026 11:29pm

[coderabbitai]

Walkthrough

The theme snapshot test now passes an explicit identity serializer to the snapshot assertion. The expected TypeDoc output changed from an escaped single-line string to a multiline template literal. The rendered Markdown content, documented entities, annotations, examples, overloads, and types remain unchanged.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the raw string serializer change for theme Markdown snapshots.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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