code-drawing Coverage Pass

Summary

Do one small non-React pass on @platejs/code-drawing.

Real seams:

• BaseCodeDrawingPlugin
• insertCodeDrawing
• renderers

Skip /react and skip browser download plumbing unless the direct renderer tests expose a real issue.

Constraints

• fast lane only
• no /react
• no fake smoke coverage

Planned Coverage

1. BaseCodeDrawingPlugin.spec.ts

   • code drawing nodes are void elements

2. insertCodeDrawing.spec.ts

   • inserts default node shape and data
   • respects configured node type
   • merges custom data while keeping defaults

3. renderers.spec.ts

   • renderPlantUml encodes, fetches SVG, and returns a data URL
   • renderMermaid initializes once and returns a data URL
   • renderCodeDrawing returns empty string for blank content
   • renderCodeDrawing throws for unsupported drawing types

Verification

• targeted bun test on touched code-drawing specs
• bun test packages/code-drawing/src
• pnpm test:profile -- --top 20 packages/code-drawing/src
• pnpm test:slowest -- --top 20 packages/code-drawing/src
• pnpm install
• pnpm turbo build --filter=./packages/code-drawing
• pnpm turbo typecheck --filter=./packages/code-drawing
• pnpm lint:fix

Deferred

• /react
• downloadImage
• Graphviz and Flowchart renderer internals