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This is a read-only mining codemod. It emits JSSG metrics and does not edit source files. ## Scope The core detection logic applies to any React or TSX codebase. It looks for reads that cross process, thread, or subsystem boundaries inside render scopes — the kind of work that can cause jank when it runs on every paint. This package includes a few repo-specific hooks for tldraw repo as a demonstration of how you can tailor a codemod to your own conventions. Those extensions are optional patterns you can copy, rename, or remove when adapting the codemod elsewhere. ## What it detects ### General React render scopes - Function components that return JSX - React class `render()` methods that return JSX - Render wrappers and callbacks such as `memo`, `forwardRef`, `useMemo`, and `useCallback` - One-hop derived helper functions called directly from a render scope ### tldraw-specific extensions (demonstration) These patterns are included to show how a codemod can be customized for a particular repo: - `ShapeUtil.component()` and `ShapeUtil.toSvg()` methods on classes named `*ShapeUtil` - tldraw reactive wrappers and callbacks such as `track`, `useValue`, `useStateTracking`, `useQuickReactor`, `useReactor`, `computed`, and `react` To adapt this codemod for another project, edit `scripts/codemod.ts`: add your own render-scope classifiers, receiver names, and hook sets alongside or instead of the tldraw-specific ones. ### Cross-boundary reads Inside those scopes it emits metrics for likely cross-boundary reads, including: - Namespace reads such as `wasm.*`, `Module.*`, `worker.*`, `engine.*`, `canvas.*`, `scene.*`, `runtime.*`, and `bridge.*` - Repository-style reads such as `store.get*()`, `model.get*()`, `doc.get*()`, `editor.get*()`, `editor.store.*`, and `app.get*()` - Hot render paths such as JSX expressions, component bodies, collection callbacks, loops, and derived render helpers - Serialization or cloning around the read, such as `JSON.stringify`, `Array.from`, `.toJSON()`, `.serialize()`, and `.clone()` - Lower severity for memoized, cached, batched, or snapshot-style reads ## Metrics Each finding increments `render-boundary-read` with dimensions for severity, file, line, scope, boundary, operation, hot path, serialization, caching, and reasons. 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