mermaid-js/mermaid · error · Error

EventModeling config not found

Error message

EventModeling config not found

What it means

Error "EventModeling config not found" thrown in mermaid-js/mermaid.

Source

Thrown at packages/mermaid/src/diagrams/eventmodeling/renderer.ts:131

      .attr('y', swimlane.y)
      .attr('rx', '3')
      .attr('width', maxR + diagramProps.swimlanePadding)
      .attr('height', swimlane.height)
      .attr('fill', oddBackground)
      .attr('stroke', backgroundStroke);

    g.append('text')
      .attr('font-weight', diagramProps.swimlaneTextFontWeight)
      .attr('x', 30)
      .attr('y', swimlane.y + 30)
      .text(swimlane.label);
  };
}

export const draw: DrawDefinition = function (txt, id, ver, diagObj) {
  log.debug('in eventmodeling renderer', txt + '\n', 'id:', id, ver);
  if (!DEFAULT_EVENTMODELING_CONFIG) {
    throw new Error('EventModeling config not found');
  }
  const db = diagObj.db as EventModelingDB;
  const { themeVariables, eventmodeling: config } = getConfig();

  const diagram: Selection<BaseType, unknown, HTMLElement, any> = select(`[id="${id}"]`);

  const diagramProps = db.getDiagramProps();
  const state = db.getState();

  const arrowheadId = `em-arrowhead-${id}`;
  const arrowheadColor = themeVariables.emArrowhead ?? '#000000';

  state.sortedSwimlanesArray.forEach(
    renderD3Swimlane(diagram, state.maxR, diagramProps, themeVariables)
  );
  state.boxes.forEach(renderD3Box(diagram, diagramProps));
  state.relations.forEach(renderD3Relation(diagram, diagramProps, arrowheadId, themeVariables));

View on GitHub (pinned to d93e9c88c0)

When it happens

Trigger: Thrown at packages/mermaid/src/diagrams/eventmodeling/renderer.ts:131 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of mermaid-js/mermaid@d93e9c88c0 (2026-08-12). Data as JSON: /api/errors/02062be49d480b28. Report an issue: GitHub.