Linter Autofix Patterns Skill

Linter Autofix Patterns

Quick reference for running linter autofixes across languages.

Autofix Commands

| Language | Linter | Autofix Command | |----------|--------|-----------------| | TypeScript/JS | biome | npx @biomejs/biome check --write . | | TypeScript/JS | biome format | npx @biomejs/biome format --write . | | Python | ruff | ruff check --fix . | | Python | ruff format | ruff format . | | Rust | clippy | cargo clippy --fix --allow-dirty | | Rust | rustfmt | cargo fmt | | Go | gofmt | gofmt -w . | | Go | go mod | go mod tidy | | Shell | shellcheck | No autofix (manual only) |

Common Fix Patterns

JavaScript/TypeScript (Biome)

Unused imports

// Before
import { useState, useEffect, useMemo } from 'react';
// Only useState used

// After
import { useState } from 'react';

Prefer const

// Before
let x = 5;  // Never reassigned

// After
const x = 5;

Python (Ruff)

Import sorting (I001)

# Before
import os
from typing import List
import sys

# After
import os
import sys
from typing import List

Unused imports (F401)

# Before
import os
import sys  # unused

# After
import os

Line too long (E501)

# Before
result = some_function(very_long_argument_one, very_long_argument_two, very_long_argument_three)

# After
result = some_function(
    very_long_argument_one,
    very_long_argument_two,
    very_long_argument_three,
)

Rust (Clippy)

Redundant clone

// Before
let s = String::from("hello").clone();

// After
let s = String::from("hello");

Use if let

// Before
match option {
    Some(x) => do_something(x),
    None => {},
}

// After
if let Some(x) = option {
    do_something(x);
}

Shell (ShellCheck)

Quote variables (SC2086)

# Before
echo $variable

# After
echo "$variable"

Use $(...) instead of backticks (SC2006)

# Before
result=`command`

# After
result=$(command)

Quick Autofix (Recommended)

Auto-detect project linters and run all appropriate fixers in one command:

# Fix mode: detect linters and apply all autofixes
bash "${CLAUDE_PLUGIN_ROOT}/skills/linter-autofix/scripts/detect-and-fix.sh"

# Check-only mode: report issues without fixing
bash "${CLAUDE_PLUGIN_ROOT}/skills/linter-autofix/scripts/detect-and-fix.sh" --check-only

The script detects biome, eslint, prettier, ruff, black, clippy, rustfmt, gofmt, golangci-lint, and shellcheck. It reports which linters were found, runs them, and shows modified files. See scripts/detect-and-fix.sh for details.

Manual Workflow

Run autofix first: ruff check --fix . && ruff format .
Check remaining issues: ruff check .
Manual fixes for complex cases
Verify: re-run linter to confirm clean

When to Escalate

Stop and use different approach when:

Fix requires understanding business logic
Multiple files need coordinated changes
Warning indicates potential bug (not just style)
Security-related linter rule
Type error requires interface/API changes

Agent Skills: Linter Autofix Patterns

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