Skill: Type Fix

Objective

Fix TypeScript compilation errors related to types in 1-3 files: add explicit type annotations, fix return types and argument types. Adapted for this repo: Astro, Svelte, TypeScript; follow AGENTS.md and existing type patterns in src/lib/types.ts.

Non-Goals

• Does NOT refactor logic or add features
• Does NOT change runtime behavior
• Does NOT modify more than 3 files
• Does NOT introduce new type files without agreement

Tier Classification

Tier: 1 - Light/Cheap

Reasoning: Mechanical type fixes in small scope; low risk; pattern-following (existing types in lib/).

Inputs

Required Parameters

• $FILES: File(s) with type errors (or "current file" / leave empty to use compiler output)
• $ERRORS: Optional — specific error messages or astro check output

Optional Parameters

• $CONTEXT: Related type definitions to reuse (e.g., from src/lib/types.ts)

Prerequisites

Before running this skill, ensure:

• Type errors are from TypeScript compiler or IDE (not runtime)
• No uncommitted changes or working on a dedicated branch

Steps

Step 1: Identify Errors

• Run pnpm run astro:check or read IDE errors for the target files
• List missing types, incompatible signatures

Step 2: Apply Type Fixes

• Add explicit parameter and return types
• Use types from src/lib/types.ts or Astro's built-in types
• Use import type for type-only imports
• Fix generic parameters if needed
• Do not change logic

Step 3: Validate

pnpm run astro:check
pnpm run biome:check

Output Format

Success Output

## ✅ Type Fix Complete

### Files
- `{file1}`: {what was fixed}
- `{file2}`: {what was fixed}

### Validation
- TypeScript: ✅ No errors
- pnpm run astro:check: ✅
- pnpm run biome:check: ✅

### Commit Message
fix: resolve TypeScript types in {files}

Escalation

## ❌ Type Fix Not Enough

### Reason
{Errors require new type definitions / many files / architectural types}

### Recommendation
Escalate to Tier 2 or architect for type design.

Guardrails

Scope Limits

• Maximum files: 3
• Maximum LOC changed: 100
• Allowed: Annotations, using existing types from lib/types.ts

Stop Conditions

Stop and escalate if:

• New shared types needed
• More than 3 files affected
• Changes affect component API surface

Definition of Done

• No TypeScript errors in target files
• pnpm run astro:check passes
• pnpm run biome:check passes

Common Astro Types

// Built-in Astro types
import type { APIRoute } from 'astro';
import type { CollectionEntry } from 'astro:content';

// Content Collection types
type MethodologyDoc = CollectionEntry<'methodology'>;
type KitEntry = CollectionEntry<'kit'>;

// Component props
interface Props {
  title: string;
  description?: string;
}

Related

• fix-lint - Biome/style fixes
• quick-fix - Small bug fixes
• reviewer - Review type quality