fix: use jsdelivr's content-type header to detect binary file

[shuuji3]

🔗 Linked issue

resolve#2034

🧭 Context

#1959 introduced a new feature to detect the binary file to prevent showing binary content in the text content viewer. But the current detection method is only checking the filename, resulting in the possible false positive detection.

This switches the logic to use the content-type header from the upstream CDN response.

📚 Description

• Currently, the server API endpoint to fetch a requested file from jsdelivr CDN, only returns the CDN file content to the client, now it also returns the content-type header value from CDN.
• Update the binary detection logic on the client side to use content-type. For example, image/* will be estimated as a binary file, instead of checking if the file path ends with .png, .jpg, etc.

Example:

• wasm: https://npmxdev-git-shuuji3-fiximprove-binary-file-detectio-db2889-npmx.vercel.app/package-code/@repomix/tree-sitter-wasms/v/0.1.16/out%2Ftree-sitter-python.wasm
• font: https://npmxdev-git-shuuji3-fiximprove-binary-file-detectio-db2889-npmx.vercel.app/package-code/vitepress/v/1.6.4/dist%2Fclient%2Ftheme-default%2Ffonts%2Finter-italic-cyrillic-ext.woff2

[vercel]

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Project	Deployment	Actions	Updated (UTC)
docs.npmx.dev	Ready	Preview, Comment	Mar 14, 2026 8:37am
npmx.dev	Ready	Preview, Comment	Mar 14, 2026 8:37am

1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
npmx-lunaria	Ignored		Mar 14, 2026 8:37am

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ All tests successful. No failed tests found.

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[github-actions]

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Tracked Files

File	Note
i18n/locales/en.json	Source changed, localizations will be marked as outdated.

Warnings reference

Icon	Description
🔄️	The source for this localization has been updated since the creation of this pull request, make sure all changes in the source have been applied.

[coderabbitai]

📝 Walkthrough

Walkthrough

Refactors binary-file detection from path-extension based logic to MIME type-based checks by replacing isBinaryFilePath with isBinaryContentType. The server file fetcher now returns { content, contentType } and the API response exposes a new contentType field. The shared PackageFileContentResponse type gains an optional contentType: string | null. Frontend guards that previously excluded binary files by path were removed; UI warnings for unsupported previews now include the actual MIME content type.

Possibly related PRs

• feat: add binary file warning #1959: Introduced extension-based binary detection and related UI warning; this PR replaces that detection with MIME-based logic and threads contentType from the server.

Suggested reviewers

• 43081j

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Linked Issues check	✅ Passed	The PR addresses issue #2034 by implementing content-type-based binary detection via CDN headers instead of solely relying on file extensions.
Out of Scope Changes check	✅ Passed	All changes are scoped to resolving #2034: adding contentType to the API response, updating binary detection logic, and displaying the content type in warnings.
Description check	✅ Passed	The pull request description is directly related to the changeset, providing context about the shift from path-based to content-type-based binary file detection.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch shuuji3/fix/improve-binary-file-detection-with-content-type

📝 Coding Plan

• Generate coding plan for human review comments

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