feat: 添加 markdown 导出支持

[fnknzzz]

增加小程序专用 markdown 导出，在直接使用 markdown 场景下，优化约 120kb 大小

Summary by CodeRabbit

• New Features
  • Added Markdown export support to the Chat SDK. Users can now export chat conversations and content in Markdown format, providing improved flexibility for saving, sharing, and integrating chat data into other workflows.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 571247af-fb08-4a57-9380-c527d95da3e1

📥 Commits

Reviewing files that changed from the base of the PR and between 926e67b and a863525.

📒 Files selected for processing (2)

• common/changes/@coze/chat-sdk/feat-chat-sdk-add-markdown-export_2026-05-15-09-02.json
• packages/chat-sdk/package.json

📝 Walkthrough

Walkthrough

The PR adds markdown export support to the @coze/chat-sdk package by updating the package exports map and recording the change in the changelog. The new ./markdown subpath points to the markdown module entry at dist/lib-source/src/exports/markdown/index.js.

Changes

Markdown Export

Layer / File(s)	Summary
Markdown export declaration and setup common/changes/@coze/chat-sdk/feat-chat-sdk-add-markdown-export_2026-05-15-07-40.json, packages/chat-sdk/package.json	Changelog entry documents markdown export addition, and package.json exports map adds a new ./markdown subpath mapping to expose the markdown module.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~5 minutes

Possibly related PRs

• coze-dev/coze-js#253: Both PRs extend packages/chat-sdk's markdown export surface by adding/pointing to the markdown entrypoints (e.g., packages/chat-sdk/package.json exports and the src/exports/markdown/* modules).

Suggested reviewers

• jackshen310
• DingGao-Devin

Poem

🐰 A markdown path now shines so bright,
Exported clean, the SDK's delight!
The changelog sings, the config's true—
One more subpath to share with you! ✨

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat: 添加 markdown 导出支持' (Add markdown export support) directly aligns with the main changes: adding a new markdown export subpath to package.json and creating associated change records for markdown export functionality.
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.

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Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@packages/chat-sdk/package.json`:
- Line 9: The package.json exports include a public subpath "./markdown"
pointing to "./dist/lib-source/src/exports/markdown/index.js" but there is no
corresponding types mapping, so TypeScript consumers of `@coze/chat-sdk/markdown`
will lack typings; add a types entry for "./markdown" mirroring the pattern used
by "./webJs" and "./markdownJs" (e.g., map "./markdown" to the compiled d.ts
path under exports.types and/or add an entry in typesVersions pointing
"./markdown" to the appropriate source .d.ts), ensuring the symbol "./markdown"
appears in both exports.types (or exports["./markdown"].types) and typesVersions
the same way as "./webJs" and "./markdownJs".

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: d7bf4ea3-de34-41f7-8cbc-957fd9c664da

📥 Commits

Reviewing files that changed from the base of the PR and between 0037049 and 926e67b.

📒 Files selected for processing (2)

• common/changes/@coze/chat-sdk/feat-chat-sdk-add-markdown-export_2026-05-15-07-40.json
• packages/chat-sdk/package.json