The Mermaid 11 lexer reads the first ] as the node closer and bails on the trailing ]. Wrapping the whole content in "…" and preserving the inner […] text fixes the parse — quoted node labels accept [ and ] as literal text.
Idempotent: labels that are already quoted or that have no nested [ are returned unchanged. Runs before quoteFlowchartNodeLabels so that pipeline does not see the malformed bracket nesting.
Quote flowchart / graph node labels that contain an inner
[inside the outer bracketed payload — e.g.The Mermaid 11 lexer reads the first
]as the node closer and bails on the trailing]. Wrapping the whole content in"…"and preserving the inner[…]text fixes the parse — quoted node labels accept[and]as literal text.Idempotent: labels that are already quoted or that have no nested
[are returned unchanged. Runs beforequoteFlowchartNodeLabelsso that pipeline does not see the malformed bracket nesting.