# TASK-003: Runtime React 18.3.1 Upgrade - CHECKLIST

## Status: ✅ COMPLETE

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## Code Migration

- [x] **Main entry point** - Update `noodl-viewer-react.js`
  - [x] Replace `ReactDOM.render()` with `createRoot().render()`
  - [x] Replace `ReactDOM.hydrate()` with `hydrateRoot()`
  - [x] Add root management (`currentRoot` variable)
  - [x] Add `unmount()` method

- [x] **React component node** - Update `react-component-node.js`
  - [x] Remove `ReactDOM.findDOMNode()` usage
  - [x] Add DOM element storage via ref callback
  - [x] Update `getDOMElement()` to use stored reference
  - [x] Remove unused `ReactDOM` import

- [x] **Group component** - Update `Group.tsx`
  - [x] Convert `UNSAFE_componentWillReceiveProps` to `componentDidUpdate`

- [x] **Drag component** - Update `Drag.tsx`
  - [x] Convert `UNSAFE_componentWillReceiveProps` to `componentDidUpdate`

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## UMD Bundles

- [x] **Download React 18.3.1 bundles** to `static/shared/`
  - [x] `react.production.min.js` (10.7KB)
  - [x] `react-dom.production.min.js` (128KB)

> Note: React 19 removed UMD builds. React 18.3.1 is the latest with UMD support.

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## SSR Configuration

- [x] **Update SSR package.json** - `static/ssr/package.json`
  - [x] Update `react` to `^18.3.1`
  - [x] Update `react-dom` to `^18.3.1`

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## Build Verification

- [x] **Run viewer build** - `npm run ci:build:viewer`
  - [x] Webpack compiles without errors
  - [x] React externals properly configured

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## Documentation

- [x] **Create CHANGELOG.md** - Document all changes
- [x] **Create CHECKLIST.md** - This file
- [x] **Create LEARNINGS-RUNTIME.md** - Runtime architecture docs in `dev-docs/reference/`

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## Testing (Manual)

- [ ] **Test in editor** - Open project and verify preview works
- [ ] **Test deployed project** - Verify published projects render correctly
- [ ] **Test SSR** - Verify server-side rendering works (if applicable)

> Note: Manual testing requires running the editor. Build verification passed.

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## Summary

| Category | Items | Completed |
|----------|-------|-----------|
| Code Migration | 4 files | ✅ 4/4 |
| UMD Bundles | 2 files | ✅ 2/2 |
| SSR Config | 1 file | ✅ 1/1 |
| Build | 1 verification | ✅ 1/1 |
| Documentation | 3 files | ✅ 3/3 |
| Manual Testing | 3 items | ⏳ Pending |

**Overall: 11/14 items complete (79%)**

Manual testing deferred to integration testing phase.
