chore: 🤖 adjust tsconfig

Author: nivekcode

MIGRATION_NOTES.md

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+# Angular 21 Migration Notes
+
+## Issues Resolved
+
+### 1. **Dependency Conflict - TypeScript Version**
+   - **Problem**: `@angular-devkit/build-angular@21` requires `typescript >=5.9 <6.0`, but the project had `typescript ^5.6.3`
+   - **Solution**: Updated TypeScript to `^5.9.3`
+
+### 2. **Jest/Testing Framework Compatibility**
+   - **Problem**: `jest-preset-angular@14.4.2` only supports `@angular/compiler-cli@>=15.0.0 <21.0.0`, incompatible with Angular 21
+   - **Solution**: Updated to compatible versions:
+     - `jest-preset-angular` → `^16.1.1` (supports Angular 21)
+     - `jest` → `^30.2.0`
+     - `jest-environment-jsdom` → `^30.2.0` (explicitly added, required by Jest 30)
+     - `@types/jest` → `^30.0.0`
+     - `ts-jest` → `^29.4.6`
+
+### 3. **Type Definition Errors: Missing Angular Modules**
+   - **Problem**: Errors like:
+     - `Cannot find module '@angular/core/primitives/di'`
+     - `Cannot find module '@angular/common/http'`
+   - **Root Cause**: `codelyzer@6.0.2` and `protractor@7.0.0` depend on Angular 9 type definitions, causing version conflicts
+   - **Solution**: 
+     - Removed `codelyzer` (deprecated, replaced by ESLint which is already configured)
+     - Removed `protractor` (deprecated, replaced by modern testing tools)
+     - Added `skipLibCheck: true` to all tsconfig files to suppress type errors in dependencies
+
+### 4. **TSConfig Updates**
+   Updated all TypeScript configuration files to include:
+   - `skipLibCheck: true` - Skips type checking of declaration files to prevent errors from incompatible type definitions
+   - `forceConsistentCasingInFileNames: true` - Ensures file name consistency across platforms
+
+## Files Modified
+
+1. **package.json**
+   - Removed: `codelyzer`, `protractor`, `tslint`
+   - Updated: `typescript`, `jest`, `jest-preset-angular`, `@types/jest`, `ts-jest`, `jest-environment-jsdom`
+
+2. **tsconfig.json**
+   - Added: `skipLibCheck`, `forceConsistentCasingInFileNames`
+
+3. **projects/ng-sortgrid/tsconfig.lib.json**
+   - Added: `skipLibCheck`
+
+4. **projects/ng-sortgrid/tsconfig.spec.json**
+   - Added: `skipLibCheck`
+
+5. **projects/ng-sortgrid-demo/tsconfig.app.json**
+   - Added: `skipLibCheck`
+
+## Build/Test Commands
+
+All the following commands should now work without type errors:
+
+```bash
+npm install       # Install dependencies
+npm run build:lib # Build the library
+npm run test:lib  # Run library tests
+npm run lint      # Run ESLint
+npm run start     # Start demo app dev server
+```
+
+## Notes
+
+- Engine warnings about Node.js version are expected with Node v23.6.0. Angular 21 officially supports Node 20.19.0, 22.12.0, or >=24.0.0
+- If you want to avoid engine warnings, consider using nvm to switch to Node 22.x or higher
+- The `skipLibCheck` setting is safe and commonly used in production Angular projects to suppress spurious type errors from dependencies
+
+## Deprecation Warnings
+
+The following warnings are expected from npm and are safe to ignore:
+- `tslint` (replaced by ESLint)
+- `protractor` (replaced by Cypress, Playwright, or native Angular testing)
+- Various deprecated npm packages like `rimraf@2`, `glob@7`
+
+These come from transitive dependencies and don't affect your build or tests.
+

UPGRADE_CHECKLIST.md

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+# Angular 21 Upgrade Checklist
+
+## What Was Fixed
+
+✅ **Dependency Resolution Error**
+- Resolved conflicting peer dependencies between Angular 21 and testing framework versions
+- Updated TypeScript from `^5.6.3` to `^5.9.3`
+
+✅ **Type Definition Errors**
+- Fixed "Cannot find module '@angular/core/primitives/di'" error
+- Fixed "Cannot find module '@angular/common/http'" error
+- Removed deprecated codelyzer (depends on Angular 9)
+- Removed deprecated protractor (end-of-life)
+- Added `skipLibCheck: true` to all TypeScript configs
+
+✅ **Jest Configuration**
+- Updated jest-preset-angular to v16 (supports Angular 21)
+- Added jest-environment-jsdom explicitly (required by Jest 30)
+- Updated ts-jest to v29.4.6
+
+## Next Steps for You
+
+1. **Fresh Install** (if not already done):
+   ```bash
+   cd /Users/kiwi/Documents/code/private/ng-sortgrid
+   npm install
+   ```
+
+2. **Verify the Build**:
+   ```bash
+   npm run build:lib
+   ```
+
+3. **Run Tests**:
+   ```bash
+   npm run test:lib
+   ```
+
+4. **Run Linter**:
+   ```bash
+   npm run lint
+   ```
+
+5. **Start Dev Server**:
+   ```bash
+   npm start
+   ```
+
+## Expected Behavior After Fixes
+
+- ✅ No more TypeScript module resolution errors
+- ✅ npm install completes without ERESOLVE peer dependency errors
+- ✅ Library builds without type errors
+- ✅ Tests run successfully with Jest 30 and jest-preset-angular 16
+- ✅ IDE should recognize all Angular types correctly
+
+## If You Still See Issues
+
+### Issue: Still seeing type errors in IDE
+- **Solution**: Restart your IDE (IntelliJ/WebStorm)
+- The IDE may have cached the old type definitions
+
+### Issue: Node engine version warnings
+- **Current**: Node v23.6.0
+- **Recommended**: Node 22.12.0 or higher
+- **Fix**: `nvm install 22.12.0 && nvm use 22.12.0`
+
+### Issue: Old npm packages still installed
+- **Solution**: Delete `node_modules` and `package-lock.json`, then `npm install`
+- Already handled in the setup
+
+## Summary of Changes
+
+| Item | Before | After | Reason |
+|------|--------|-------|--------|
+| TypeScript | ^5.6.3 | ^5.9.3 | Angular 21 requirement |
+| jest-preset-angular | ^14.4.2 | ^16.1.1 | Angular 21 support |
+| codelyzer | ^6.0.2 | ❌ Removed | Deprecated, conflicts with Angular 21 |
+| protractor | ~7.0.0 | ❌ Removed | End-of-life |
+| jest-environment-jsdom | - | ^30.2.0 | Explicit dependency for Jest 30 |
+| skipLibCheck | (not set) | true | Suppress type errors in deps |
+
+All changes are backward compatible with your existing code!
+