@triplef/pdf

Single-owner pdfjs integration for the tripleF (3F) apps — the one and only place that depends on pdfjs-dist.

• PdfService.extractText(buffer) → per-page text layer (string[], aligned 1:1 with pages; '' for pages without a text layer, e.g. scanned pages).
• PdfService.renderPages(buffer, scale?) → per-page PNG buffers ({ buffer, mimeType: 'image/png', pageNumber }), white background, rendered via pdfjs' built-in NodeCanvasFactory on top of @napi-rs/canvas (a runtime dependency of this package).

Usage

import { PdfModule } from '@triplef/pdf';

@Module({
  imports: [PdfModule.registerAsync({ global: true })],
})
export class AppModule {}

Then inject PdfService wherever it is needed.

Notes

• Uses the pdfjs legacy Node build (pdfjs-dist/legacy/build/pdf.mjs) with standard fonts and CMaps resolved from the installed pdfjs-dist package, so CJK documents extract and render correctly.
• No isEvalSupported option: pdfjs ≥5.7 removed it together with the PostScript eval path (CVE-2024-4367 surface).
• Post-processing (e.g. JPEG re-encode for token efficiency) is intentionally left to the consuming app.