# TASK-006 Changelog

## [Completed] - 2025-12-08

### Summary
Successfully upgraded TypeScript from 4.9.5 to 5.9.3 and related ESLint packages, enabling modern TypeScript features and Zod v4 compatibility.

### Changes Made

#### Dependencies Upgraded
| Package | Previous | New |
|---------|----------|-----|
| `typescript` | 4.9.5 | 5.9.3 |
| `@typescript-eslint/parser` | 5.62.0 | 7.18.0 |
| `@typescript-eslint/eslint-plugin` | 5.62.0 | 7.18.0 |

#### Files Modified

**package.json (root)**
- Upgraded TypeScript to ^5.9.3
- Upgraded @typescript-eslint/parser to ^7.18.0
- Upgraded @typescript-eslint/eslint-plugin to ^7.18.0

**packages/noodl-editor/package.json**
- Upgraded TypeScript devDependency to ^5.9.3

**packages/noodl-editor/webpackconfigs/shared/webpack.renderer.core.js**
- Removed `transpileOnly: true` workaround from ts-loader configuration
- Full type-checking now enabled during webpack builds

#### Type Error Fixes (9 errors resolved)

1. **packages/noodl-core-ui/src/components/property-panel/PropertyPanelBaseInput/PropertyPanelBaseInput.tsx** (5 errors)
   - Fixed incorrect event handler types: Changed `HTMLButtonElement` to `HTMLInputElement` for onClick, onMouseEnter, onMouseLeave, onFocus, onBlur props

2. **packages/noodl-editor/src/editor/src/utils/keyboardhandler.ts** (1 error)
   - Fixed type annotation: Changed `KeyMod` return type to `number` since the function can return 0 which isn't a valid KeyMod enum value

3. **packages/noodl-editor/src/editor/src/utils/model.ts** (2 errors)
   - Removed two unused `@ts-expect-error` directives that were no longer needed in TS5

4. **packages/noodl-editor/src/editor/src/views/EditorTopbar/ScreenSizes.ts** (1 error)
   - Removed `@ts-expect-error` directive and added proper type guard predicate to filter function

### Verification
- ✅ `npm run typecheck` passes with no errors
- ✅ All type errors from TS5's stricter checks resolved
- ✅ ESLint packages compatible with TS5

### Notes
- The Zod upgrade (mentioned in original task scope) was not needed as Zod is not currently used directly in the codebase
- The `transpileOnly: true` workaround was originally added to bypass Zod v4 type definition issues; this has been removed now that TS5 is in use
