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pptxgenjs is gone, and with it 269 lines of hand-rolled markdown parsing. It stretched every image. Reading the slide XML it emitted shows why: it writes the target box verbatim with <a:stretch/> and a no-op srcRect, so a 200x800 image handed an 11.8x3.9 box came out 1:4 squashed to 3:1. It could not do better — it never measures an image, and its own getSizeFromImage is commented out and marked "currently unused", reaching for a package called sizeof that does not exist. pandoc measures them: a 300x175 source renders at aspect 1.714 and a 160x360 at 0.445, verified by rendering the deck to PDF and looking at it. Tables, ordered and unordered lists, bold, italic and subscripts all come out natively, and the fonts, palette and slide layouts come from assets/learning/slides-reference.pptx. Design now lives in that file: restyling the decks means editing it in PowerPoint, not editing this route. Only images the requester owns can reach a deck. pandoc resolves an image link against the filesystem, so a markdown link naming any local path would read that file into the presentation. Images are fetched by id through the ownership check, written into a per-request temporary directory under names we choose, and every image link that did not resolve is removed rather than passed through. The directory is removed in a finally block, and the conversion has a 60s timeout so it cannot hang a request. pandoc is in the image rather than a sidecar, because an export must not fail for reasons outside this container. It costs 197MB (307 -> 504). Removing pptxgenjs also removed image-size, and with it both high-severity advisories — GHSA-w3rx-r6r6-pgpr and GHSA-5p2g-fcmc-qvqq, ICNS/JXL/HEIF parser denial of service, ranged <=2.0.2 with no fixed release to upgrade to. npm audit goes from 2 high and 2 moderate to 2 moderate. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01Dv6sqaY6Vq3ChZHMem3cnU
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