What about mermaid-js? Here's a sequence diagram example: https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoic2VxdWVuY2VEaWFncmFtXG5cdEFsaWNlLT

What about mermaid-js? Here's a sequence diagram example: https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJjb2RlIjoic2VxdWVuY2VEaWFncmFtXG5cdEFsaWNlLT4-K0pvaG46IEhlbGxvIEpvaG4sIGhvdyBhcmUgeW91P1xuXHRBbGljZS0-PitKb2huOiBKb2huLCBjYW4geW91IGhlYXIgbWU_XG5cdEpvaG4tLT4-LUFsaWNlOiBIaSBBbGljZSwgSSBjYW4gaGVhciB5b3UhXG5cdEpvaG4tLT4-LUFsaWNlOiBJIGZlZWwgZ3JlYXQhXG5cdFx0XHRcdFx0IiwibWVybWFpZCI6eyJ0aGVtZSI6ImRlZmF1bHQifSwidXBkYXRlRWRpdG9yIjp0cnVlfQ https://mermaid-js.github.io/mermaid-live-editor/#/edit/eyJj...