Doc Agent

import { pdf } from 'pdf-to-img'; import type { LogLevel, StreamCallback } from './types'; /** * Helper to emit log via stream callback */ function emitLog( onStream: StreamCallback | undefined, level: LogLevel, message: string, data?: Record<string, unknown> ): void { onStream?.({ type: 'log', level, message, data }); } /** * Convert PDF to PNG images (all pages) for vision models that don't support PDF * @returns Array of image buffers, or null if conversion fails */ export async function pdfToImages( filePath: string, onStream?: StreamCallback ): Promise<Buffer[] | null> { try { // Higher scale = better OCR quality (3 is good balance of quality vs size) const document = await pdf(filePath, { scale: 3 }); const pages: Buffer[] = []; for await (const page of document) { pages.push(Buffer.from(page)); } emitLog(onStream, 'debug', `PDF converted: ${pages.length} pages`, { filePath, pageCount: pages.length, }); return pages.length > 0 ? pages : null; } catch (error) { emitLog(onStream, 'error', 'PDF conversion failed', { filePath, error: String(error), }); return null; } }