Linter Autofix Patterns

Quick reference for running linter autofixes across languages.

Autofix Commands

Language Linter Autofix Command

TypeScript/JS biome bunx @biomejs/biome check --write .

TypeScript/JS biome format bunx @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 apply shellcheck -f diff suggestions

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