feat(markdown): add isMarkdownAstEqual

[ocavuebot]

This PR adds isMarkdownAstEqual(a, b), which walks two Markdown AST trees breadth-first and compares each pair of nodes field by field. It does not compare position.

A host that compares two trees with JSON.stringify depends on the order in which fields were set, and it must strip every position first.

Summary by CodeRabbit

• New Features

  • Added isMarkdownAstEqual to compare Markdown ASTs while ignoring position information. Optional fields that are missing or set to undefined are treated as equal.
  • Documented the comparison behavior.

• Tests

  • Added coverage for matching and differing trees, including node fields, children, frontmatter, and serialized documents.

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1 Skipped Deployment

Project	Deployment	Actions	Updated
meowdown	Ignored		Oct 4, 2026 8:33am UTC

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• Configuration used: defaults
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• Run ID: 204caed5-89f1-4fb1-a0c6-ae1ef3e8e38a

📥 Commits

Reviewing files that changed from the base of the PR and between 7eb8d75 and 067d7ee.

📒 Files selected for processing (5)

• .changeset/markdown-ast-equal.md
• packages/markdown/README.md
• packages/markdown/src/ast/equal.test.ts
• packages/markdown/src/ast/equal.ts
• packages/markdown/src/index.ts

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commit: 067d7ee

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Coverage Report

Status	Category	Percentage	Covered / Total
🔵	Lines	94.52%	5785 / 6120
🔵	Statements	92.33%	6539 / 7082
🔵	Functions	92.56%	1420 / 1534
🔵	Branches	88.7%	4498 / 5071

File Coverage

File	Stmts	Branches	Functions	Lines	Uncovered Lines
Changed Files
packages/markdown/src/index.ts	0%	0%	0%	0%
packages/markdown/src/ast/equal.ts	92.1%	84.84%	85.71%	90.32%	35-39, 93

Generated in workflow #2645 for commit 067d7ee by the Vitest Coverage Report Action