frankenmermaid

Rust diagram engine that renders Mermaid diagrams reliably at any size

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frankenmermaid is a free, open-source, Rust-based diagram engine compatible with Mermaid syntax that renders large or malformed diagrams reliably where mermaid-js crashes, producing SVG, terminal, Canvas2D, or WASM output from one shared representation. It recovers from bad input with structured diagnostics instead of failing outright, and guarantees deterministic, byte-identical output for CI snapshot testing. It's for developers generating diagrams-as-code, especially at scale or in CI, who have hit mermaid-js's crashes on large graphs or its lack of a terminal renderer.

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