feat: Mermaid diagram rendering (#3)#22
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- Add src/mermaid-renderer.ts — initializes mermaid with light/dark theme, finds pre code.language-mermaid blocks and replaces them with SVG - Import renderMermaidBlocks statically in content.ts; skip hljs on mermaid blocks - Add type-fest dev dependency to satisfy mermaid's type declarations - Rollup: inlineDynamicImports:true for IIFE format (mermaid has internal dynamic imports); bump targets to chrome120/firefox128 - tsconfig: remove skipLibCheck (type-fest satisfies the dependency properly) - Manifests: remove type:module (not needed with IIFE format) Lazy loading deferred to a future optimization — see issue for notes. Closes #3
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Summary
Renders
```mermaidfenced code blocks as SVG diagrams using Mermaid v11, fully offline.src/mermaid-renderer.ts— findspre code.language-mermaidblocks, callsmermaid.render(), replaces each<pre>with the resulting SVGprefers-color-scheme— initializes Mermaid withtheme: 'dark'or'default'content.tsskipshljs.highlightElement()on mermaid blockstype-festinstalled to satisfy Mermaid's type declarations (avoidsskipLibCheck)inlineDynamicImports: trueto produce a single IIFE (Mermaid has internal dynamic imports incompatible with IIFE code-splitting)chrome120/firefox128Bundle size
content.bundle.jsSize increase is expected — Mermaid is a large library. Lazy loading optimization tracked separately.
Diagram types tested
flowchart, sequenceDiagram, gitGraph, stateDiagram-v2, pie
Known limitation
gist.githubusercontent.comserves content in a sandboxed frame that blocks script execution — Mermaid (and the extension itself) cannot run there.file://andraw.githubusercontent.comwork correctly.Closes #3