Mermaid.js and GraphViz Diagram Renderers

Module

Web

Status

VERIFIED

Description

Reusable diagram rendering components - Mermaid.js renderer for flowcharts/sequence diagrams with theme support, and GraphViz DOT renderer using WASM (@viz-js/viz) for graph visualizations with multiple engine support (dot, neato, fdp, etc.).

Implementation Details

Feature directory: src/Web/StellaOps.Web/src/app/shared/components/visualization/
Components:
- graphviz-renderer (src/Web/StellaOps.Web/src/app/shared/components/visualization/graphviz-renderer.component.ts)
- mermaid-renderer (src/Web/StellaOps.Web/src/app/shared/components/visualization/mermaid-renderer.component.ts)
Source: Feature matrix scan

E2E Test Plan

Setup:
- Log in with a user that has appropriate permissions
- Navigate to the relevant page/section where this feature appears
- Ensure test data exists (scanned artifacts, SBOM data, or seed data as needed)
Core verification:
- Verify the visualization renders correctly with sample data
- Verify interactive elements (hover tooltips, click-to-drill-down) work
- Verify the visualization handles empty/minimal data gracefully
Edge cases:
- Verify graceful handling when backend API is unavailable (error state)
- Verify responsive layout at different viewport sizes
- Verify accessibility (keyboard navigation, screen reader labels, ARIA attributes)

Verification

Run: docs/qa/feature-checks/runs/web/mermaid-js-and-graphviz-diagram-renderers/run-001/
Tier 0 (source): pass ( ier0-source-check.json)
Tier 1 (build/tests): pass ( ier1-build-check.json)
Tier 2 (behavior): pass ( ier2-e2e-check.json)
Verified on (UTC): 2026-02-11T08:09:51Z

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