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How one developer built on-demand PNG card generation inside a Cloudflare Worker

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A developer built Commit Archive, a GitHub repo yearbook that generates custom Open Graph and contributor portrait cards as PNGs entirely within a single Cloudflare Worker. The rendering pipeline uses satori to convert layout trees into SVG and resvg-wasm to convert SVG into PNG, with warm-isolate render times averaging 56–82 milliseconds per card. Four notable issues emerged during development: WebAssembly instantiation restrictions on Workers forced a downgrade to satori 0.15.x, a native fetch binding caused illegal invocation errors in queue consumers, GitHub's contributor stats endpoint returned 202 responses for up to 15 minutes triggering retry exhaustion, and a shared free-plan request quota caused Cloudflare error 1027 after a separate Worker on the same account exceeded the 100,000 daily request limit. Each problem led to targeted fixes, including wrapping fetch in an arrow function, publishing jobs without line counts on first retry, and separating Workers across accounts.

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