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Stop Fixing Code Manually: How NeuroLint Automates What ESLint Can't

#javascript #typescript #react #nextjs

The Problem Every Developer Knows Too Well

You've been there. It's 2 AM, and you're staring at a wall of ESLint errors. Missing key props in React lists. Hydration mismatches because someone used localStorage without a server-side guard. Accessibility warnings everywhere.

ESLint tells you what's wrong. But you still have to fix it yourself.

The cost? Hours of manual fixes. Delayed releases. Production bugs that could have been prevented.

What if there was a tool that didn't just identify problems, but actually fixed them?

Introducing NeuroLint

NeuroLint is a deterministic code transformation engine that automatically fixes over 50 common issues in React, Next.js, and TypeScript projects.

The key difference? No AI. No guessing. No hallucinations.

While AI coding tools can produce unpredictable results, NeuroLint uses Abstract Syntax Tree (AST) parsing and rule-based transformations. Same input, same output, every time.

# Install globally
npm install -g @neurolint/cli

# Analyze your project
neurolint analyze . --verbose

# Preview fixes (safe, no changes)
neurolint fix . --all-layers --dry-run

# Apply fixes
neurolint fix . --all-layers
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The 5-Step Fail-Safe

Every transformation goes through a 5-step validation process:

  1. AST-First Transformation — Parses code into an Abstract Syntax Tree
  2. First Validation — Checks if the transformation is syntactically correct
  3. Regex Fallback — Falls back to regex if AST parsing fails
  4. Second Validation — Re-validates the result
  5. Accept Only If Valid — Changes only applied if they pass. Otherwise, automatic revert.

This is why NeuroLint never breaks your code.

7-Layer Progressive Architecture

Layer What It Fixes
1. Configuration Modernizes tsconfig.json, next.config.js, package.json
2. Patterns Removes console.log, fixes HTML entities, cleans unused imports
3. Components Adds React keys, accessibility attributes, button types
4. Hydration Adds SSR guards for localStorage, window, document
5. Next.js Adds 'use client' directives, optimizes Server Components
6. Testing Generates error boundaries and test scaffolding
7. Adaptive Learns patterns from previous fixes and reapplies them

10 Concrete Fixes

Here's exactly what NeuroLint does:

  1. Missing React keys — Adds unique key props to .map() lists
  2. Hydration guards — Wraps localStorage, window, document in SSR checks
  3. Button types — Adds type="button" to prevent form submissions
  4. Accessibility — Adds aria-label to buttons, alt to images
  5. 'use client' — Adds missing directives to client components
  6. Console.log removal — Strips debug statements
  7. HTML entities — Converts & to &amp;, < to &lt;
  8. Unused imports — Removes dead imports
  9. var → const/let — Modernizes variable declarations
  10. forwardRef removal — Migrates deprecated React 19 patterns

Real-World Example

Before:

function Button({ children, onClick }) {
  return <button onClick={onClick}>{children}</button>;
}
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After Layer 3 (Components):

function Button({ children, onClick }) {
  return (
    <button 
      onClick={onClick}
      aria-label={typeof children === 'string' ? children : undefined}
      type="button"
    >
      {children}
    </button>
  );
}
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After Layer 5 (Next.js):

'use client';

interface ButtonProps {
  children: React.ReactNode;
  onClick?: () => void;
}

function Button({ children, onClick }: ButtonProps) {
  return (
    <button 
      onClick={onClick}
      aria-label={typeof children === 'string' ? children : undefined}
      type="button"
    >
      {children}
    </button>
  );
}

export default Button;
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Migration Tools

React 19 Migration 

neurolint migrate-react19 . --verbose
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Handles forwardRef removal, string refs → callback refs, ReactDOM.render → createRoot.

Dependency Compatibility 

neurolint check-deps . --fix
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Detects React 19 incompatibilities and auto-generates fixes.

Why Not AI?

Feature AI Tools NeuroLint
Predictable output Can hallucinate Same input = same output
Auditable changes Black box Every change documented
Framework migrations Manual prompting One command
Backup system None Automatic timestamped backups

Getting Started 

# Install
npm install -g @neurolint/cli

# Analyze
neurolint analyze src/ --verbose

# Preview fixes (safe)
neurolint fix src/ --all-layers --dry-run

# Apply with backup
neurolint fix src/ --all-layers --backup
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Open Source (Apache 2.0)

Free forever. Commercial use allowed. No restrictions.

GitHub: github.com/Alcatecablee/Neurolint-CLI

Try It Today 

npm install -g @neurolint/cli
neurolint analyze . --verbose
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Your future self will thank you.

Questions? Open an issue on GitHub or drop a comment below!

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