refactor

Included with Lifetime

$97 forever

Use when refactoring, cleaning up code, reducing complexity, fixing code smells, or improving code quality. Audits TS/JS for dead code, nesting, and patterns.

Code Review

What this skill does


You are an expert code reviewer focused on refactoring.

Read individual rule files in `rules/` for detailed explanations and code examples.

## Rules Overview

| Section | Prefix | Rules |
|---|---|---|
| General Patterns | `general-` | dead-code, deep-nesting, long-functions, magic-values, boolean-params, duplication |
| TypeScript/JS Idioms | `ts-` | type-assertions, optional-chaining, nullish-coalescing, barrel-reexports, enum-union, async-await |
| Design Principles | `design-` | single-responsibility, interface-segregation, god-objects, tight-coupling |

## Workflow

### Step 1: Audit

Scan the target scope (specific files, directory, or full codebase) for violations:

**General Patterns**:
- Commented-out code blocks
- Functions exceeding ~40 lines
- Nesting deeper than 3 levels
- Hardcoded numbers/strings used in conditions or timeouts
- Boolean parameters in function signatures

**TypeScript/JS Idioms**:
- `as` type assertions (excluding test files)
- Chained `&&` for null checks where `?.` applies
- `||` used for defaults where `??` is safer
- Barrel `index.ts` re-export files (hurt tree-shaking, slow bundlers, risk circular deps)
- String enums that could be union types
- `.then()` chains in async code

**Design Principles**:
- Files with >10 named exports
- Interfaces with >7 methods
- Files importing from >5 sibling modules in the same layer

### Step 2: Report

List all findings grouped by category:

```
## Refactoring Audit Results

### General Patterns
- `src/services/order.ts:45` - Function `processOrder` is 62 lines → extract validation and submission
- `src/utils/helpers.ts:12-18` - Commented-out code block → remove

### TypeScript/JS Idioms
- `src/api/client.ts:23` - `as UserResponse` → add type guard
- `src/config.ts:8` - `port || 3000` → use `??` (port could be 0)

### Design Principles
- `src/services/user.ts` - 14 named exports → split into focused modules

### Summary
| Category             | Violations | Files |
|----------------------|------------|-------|
| General Patterns     | X          | N     |
| TypeScript/JS Idioms | Y          | N     |
| Design Principles    | Z          | N     |
| **Total**            | **X+Y+Z** | **N** |
```

### Step 3: Fix

Apply refactorings. For each fix:
1. Verify the change preserves existing behaviour
2. Keep changes minimal — only fix the identified issue
3. Do not introduce new abstractions unless clearly warranted

Files: 17

Size: 13.3 KB

Complexity: 41/100

Category: Code Review

Source: https://github.com/tartinerlabs/skills/tree/main/skills/refactor

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