Mermaid to ASCII: Diagram to Pseudographics Converter

The mermaid-ascii tool converts Mermaid diagram syntax into ASCII and Unicode pseudographics, running entirely in the browser thanks to a Go library compiled to WebAssembly. It supports flowcharts with labeled edges, subgraphs, and color definitions, as well as sequence diagrams with notes and control flow fragments. Users can customize indentation and output options. The author initially built their own tool based on Rust code from Grok Build but later discovered an older, more feature-rich Go library, AlexanderGrooff/mermaid-ascii, and compiled it to WebAssembly using Claude Fable 5 to compare results. Unlike the first version, the second supports colors.