fix(mistral): convert messages with PDF file parts from Uint8Array to base64 #10155
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- Add test case for PDF documents with base64 data (Uint8Array) - Extract duplicated URL/base64 handling logic into formatFileUrl helper function - Improve code maintainability by reducing duplication between image and PDF handling refactor(mistral): enhance formatFileUrl function for improved readability - Refactor the formatFileUrl function to use destructured parameters for better clarity. - Update the function calls within convertToMistralChatMessages to maintain consistent formatting. This change aims to improve code readability and maintainability.
davidsonsns
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Nov 14, 2025
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Background
Mistral's API requires PDF documents to be formatted as either HTTPS URLs or data URIs with the format
data:application/pdf;base64,<encoded-data>. When attempting to send PDF files as base64 directly from API endpoints (common use case: file upload → Mistral), the existing implementation handled this correctly but lacked test coverage to validate the format. This left uncertainty about whether PDFs could be sent directly without uploading to cloud storage first.Summary
data:application/pdf;base64, prefixManual Verification
Simulated real-world API flow where PDF is received and sent directly to Mistral:
This eliminates the need to upload PDFs to cloud storage before sending to Mistral.
Checklist
pnpm changesetin the project root)Future Work
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Related Issues
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