Build Error Resolver Skill

When to Use

• npm run build / tsc fails
• TypeScript compilation errors
• Lint errors blocking build
• Module resolution issues

Procedure

1. Capture build error output
2. Categorize error type
3. Locate affected files and lines
4. Apply appropriate fix
5. Verify build passes

Error Categories

TypeScript Errors

Error Code	Description	Common Fix
TS2304	Cannot find name	Add import or declare type
TS2339	Property does not exist	Add to interface or use optional chaining
TS2345	Argument type mismatch	Cast or fix type definition
TS2322	Type not assignable	Check type compatibility
TS7006	Parameter implicit any	Add explicit type annotation

Module Errors

Error	Common Fix
Cannot find module	Install package or fix path
Module not found	Check tsconfig paths
Circular dependency	Restructure imports

Lint Errors

Category	Action
Formatting	Run prettier --write
Unused vars	Remove or prefix with _
Missing deps	Add to dependency array

Output Format

## Build Error Resolution

### Error Summary
- Total errors: N
- Fixed: N
- Remaining: N

### Fixed Issues

1. **TS2339**: Property 'foo' does not exist
   - File: src/utils.ts:42
   - Fix: Added optional chaining `obj?.foo`

2. **TS2304**: Cannot find name 'UserType'
   - File: src/types.ts:15
   - Fix: Added import from '@/types'

### Verification
✅ `npm run build` passed
✅ `tsc --noEmit` passed

Delegation Format (for Codex)

TASK: Resolve build errors in [project path].

EXPECTED OUTCOME: All build errors fixed, build passes.

CONTEXT:
- Error output: [paste error log]
- Build command: [npm run build / tsc]
- Files affected: [list]

MUST DO:
- Fix all TypeScript errors
- Preserve existing functionality
- Run verification after each fix

MUST NOT DO:
- Add @ts-ignore unless absolutely necessary
- Change unrelated code
- Skip verification step