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Snow Lee (Sungwon)andGitHub
951c6b9de2
The viewer decided what to preview from a filename regex, so every extensionless file an agent writes — Dockerfile, LICENSE, .bdriveignore — and every unlisted extension (main.tf, schema.graphql) hit a dead "No preview for this file type." card. That bites hardest in the core use case: an agent writes an artifact, a teammate opens the hub to read it, and the hub refuses. The unmatched path now fetches once and decides on the bytes. The logic already existed for the history diff — 1 MB cap, Content-Length cheap-out, 8 KB NUL scan, fatal UTF-8 decode — so the pure half moves to lib/sniff.ts (importable by node --test, no React Query) and both DiffView and FileView call it. Exactly one sniffer, per the spec. .pdf gets the browser's own viewer in an iframe, in the wide page column (768px is unreadable for a PDF page). No sandbox attribute, deliberately: the PDF viewer is not this page's JS realm, so it cannot reach the hub API or its cookies, and sandboxing without allow-same-origin breaks Firefox's pdf.js. Files that already previewed (md/html/img/.txt) are untouched and issue no extra fetch. BEA-44