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fix-types

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[Implementation] Fix type errors

QUICK START

How to use this skill

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Source SKILL.md: https://github.com/majiayu000/claude-skill-registry/blob/HEAD/skills/development/fix-types/SKILL.md

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[IMPORTANT] Use TaskCreate to break ALL work into small tasks BEFORE starting — including tasks for each file read. This prevents context loss from long files. For simple tasks, AI MUST ask user whether to skip.

Prerequisites: MUST READ .claude/skills/shared/understand-code-first-protocol.md AND .claude/skills/shared/evidence-based-reasoning-protocol.md before executing.

  • docs/project-reference/domain-entities-reference.md — Domain entity catalog, relationships, cross-service sync (read when task involves business entities/models)

Skill Variant: Variant of /fix — TypeScript/type error resolution.

Quick Summary

Goal: Fix TypeScript compilation errors and type mismatches across the codebase.

Workflow:

  1. Collect — Run tsc --noEmit or nx build to gather type errors
  2. Analyze — Classify errors (missing types, wrong signatures, import issues)
  3. Fix — Apply type-safe fixes without any casts where possible

Key Rules:

  • Debug Mindset: every claim needs file:line evidence
  • Prefer proper typing over any or type assertions
  • Fix root cause (wrong interface, missing export) not symptoms

Run bun run typecheck or tsc or npx tsc and fix all type errors.

Debug Mindset (NON-NEGOTIABLE)

Be skeptical. Apply critical thinking, sequential thinking. Every claim needs traced proof, confidence percentages (Idea should be more than 80%).

  • Do NOT assume the first hypothesis is correct — verify with actual code traces
  • Every root cause claim must include file:line evidence
  • If you cannot prove a root cause with a code trace, state "hypothesis, not confirmed"
  • Question assumptions: "Is this really the cause?" → trace the actual execution path
  • Challenge completeness: "Are there other contributing factors?" → check related code paths
  • No "should fix it" without proof — verify the fix addresses the traced root cause

⚠️ MANDATORY: Confidence & Evidence Gate

MANDATORY IMPORTANT MUST declare Confidence: X% with evidence list + file:line proof for EVERY claim. 95%+ recommend freely | 80-94% with caveats | 60-79% list unknowns | <60% STOP — gather more evidence.

Rules

  • Fix all of type errors and repeat the process until there are no more type errors.
  • Do not use any just to pass the type check.

IMPORTANT Task Planning Notes (MUST FOLLOW)

  • Always plan and break work into many small todo tasks
  • Always add a final review todo task to verify work quality and identify fixes/enhancements
  • After fixing, MUST run /prove-fix — build code proof traces per change with confidence scores. Never skip.