Open-source alternatives to Eslint

This project is a static analysis engine and type checker designed for PHP codebases. It evaluates source code structure and type annotations to identify potential bugs, type mismatches, and logic errors without executing the application. By parsing code into an abstract syntax tree and applying a rule-based validation framework, it enforces code quality and safety standards across a project. What distinguishes this tool is its sophisticated type inference engine, which models dynamic language features, magic methods, and conditional types to maintain accuracy even in unconventional code. It

Standard is a suite of static analysis tools for JavaScript, comprising a linter, formatter, and a predefined style guide. It functions as a static code analyzer that scans source code for style violations and potential errors without executing the program. The project provides an automatic code fixer that rewrites source code to resolve formatting issues and enforce syntax consistency. It implements a standardized set of rules for JavaScript formatting and syntax to ensure a uniform appearance across different projects. The system covers a wide range of static analysis capabilities, includi

Stylelint is a static code analysis tool and linter for CSS and style-like languages. It identifies errors, enforces coding conventions, and operates as a PostCSS plugin to validate stylesheets during build pipelines. The project distinguishes itself through support for non-standard syntaxes, including preprocessor parsing for SCSS and Less, and the ability to extract and lint embedded styles from JavaScript, HTML, and template literals. It features an automated fixing system that programmatically corrects repairable styling violations to ensure consistency. The system provides a plugin arch

This project is a static analysis tool and linter designed to improve the quality, reliability, and portability of shell scripts. By performing deep structural analysis, it identifies common programming pitfalls, syntax errors, and security vulnerabilities before scripts are executed. It functions as an automated code reviewer that enforces best practices and helps developers maintain consistent, robust code across different operating environments. The tool distinguishes itself through its dialect-aware grammar resolution, which adapts its parsing logic based on the specific shell interpreter

Prettier is an opinionated code formatter that parses source code and reprints it from scratch to enforce a consistent, project-wide visual style. By transforming code into an abstract syntax tree and applying a recursive document printing process, it eliminates manual style debates and ensures that all source files adhere to a unified appearance. The project is distinguished by its extensible, plugin-based architecture, which decouples language-specific parsing logic from the core engine. This modular design allows for uniform style enforcement across diverse programming languages and comple

This project is an uncompromising, deterministic code formatter for Python. It functions by parsing source code into an abstract syntax tree and regenerating it according to a rigid, opinionated set of style rules. By automating the formatting process, it eliminates manual style debates and configuration overhead, ensuring that code remains consistent across entire projects regardless of the original input. The tool distinguishes itself through its focus on speed and seamless integration into development workflows. It utilizes content-based file caching and parallel processing to maintain hig

SwiftFormat is a tool for the Swift language that functions as a code formatter, linter, and refactoring utility. It automatically applies consistent style rules and visual formatting to source files to ensure a uniform appearance across a project. The project differentiates itself by providing both a command-line interface for batch processing and an Xcode extension for integration directly into the development environment. It includes specialized capabilities for modernizing legacy API usage, simplifying language constructs, and inferring formatting options by analyzing an existing codebase

Ruff is a high-performance static analysis and code formatting tool designed for Python. Built in Rust, it functions as a comprehensive engine that scans source code to detect programming errors, security vulnerabilities, and deviations from established coding standards. By parsing source code into a structured tree representation, it provides both automated linting and style enforcement across entire projects. The tool distinguishes itself through its speed and deep integration into the development lifecycle. It utilizes parallelized file processing to maximize throughput on large codebases

SwiftLint is a static analysis tool and code formatter designed to enforce consistent coding styles and identify semantic issues within Swift source code. It functions as a command-line utility that evaluates code against established conventions to ensure uniform structure and architectural standards across a project. The tool distinguishes itself through a custom linting engine that leverages compiler-integrated syntax analysis to perform deep inspections of code structure. Beyond simple pattern matching, it supports automated source code transformation to correct formatting violations and r

The Serverless Framework is a declarative infrastructure-as-code tool designed to automate the deployment, scaling, and lifecycle management of cloud-native applications. It provides a unified command-line interface that translates high-level configuration files into provider-specific resource templates, enabling developers to orchestrate complex architectures, event-driven functions, and cloud resources within a single project structure. What distinguishes this framework is its focus on developer experience and multi-environment parity. It supports local function invocation and event proxyin

Nushell is a cross-platform shell and programming language designed to treat all input and output as structured data rather than raw text streams. By enforcing data types and command signatures, it provides a consistent environment for building robust, pipeline-oriented workflows. The shell allows users to chain commands that pass structured objects between stages, enabling complex data processing and automation tasks that remain predictable across different operating systems. What distinguishes the project is its focus on interactive data exploration and modular extensibility. Users can quer

This project is a command-line interface that bridges local development workflows with remote platform services. It functions as a terminal-based platform client, enabling users to manage repositories, issues, and pull requests directly from their command line through authenticated API interactions. The tool provides a modular environment that supports custom binary extensions and command aliases, allowing developers to tailor their terminal experience to specific project needs. Beyond standard repository management, the tool serves as a remote development manager, offering capabilities to pr

This project is a static analysis runner designed to identify bugs, performance bottlenecks, and stylistic inconsistencies within Go codebases. It functions as a comprehensive quality assurance suite that executes multiple analysis tools concurrently to provide a unified diagnostic report. By parsing source code into a structured representation, the tool enforces coding standards, validates import structures, and ensures consistent formatting across entire projects. The tool distinguishes itself through its ability to automate the remediation of identified issues, applying programmatic fixes

Oclint is a static analysis engine and extensible linting framework designed for C, C++, and Objective-C source code. It functions as a code quality tool that identifies bugs, code smells, and structural complexities by parsing source code into abstract syntax trees to perform semantic inspection. The project is distinguished by its modular architecture, which supports dynamic plugin loading for custom inspection rules and a pluggable reporter system for exporting analysis findings in multiple formats. It replicates build configurations by reading compiler flags and include paths to ensure th

Pre-commit is a framework for managing and executing automated tasks during the version control commit process. It functions as a configuration-driven utility that enforces project standards by running linters, formatters, and security scanners on staged files before they are committed to a repository. The system uses a centralized manifest to orchestrate these tasks, ensuring consistent developer tooling across teams. It distinguishes itself by provisioning isolated environments for each tool, which prevents dependency conflicts and ensures that all required versions are present. The framewo

Semgrep is a static analysis security testing tool designed to identify vulnerabilities and logic errors by matching source code against declarative patterns. It functions as an automated scanner that integrates into development workflows to detect insecure code patterns and enforce coding standards before deployment. The engine utilizes a language-agnostic intermediate representation and a modular parser architecture to normalize diverse programming languages into a unified format. This allows for consistent rule execution across different codebases, enabling users to perform custom structur

This project is a collection of Swift coding standards and static analysis rules designed to ensure consistency across Swift projects. It provides a defined set of naming conventions and structural guidelines to maintain a shared style for teams. The repository centers on a SwiftLint configuration used to automate the detection and correction of style violations in source code. This configuration enables automated style enforcement, ensuring that code adheres to organizational standards without requiring manual review. The guidelines cover the standardization of code formatting, naming, and

Infer is a static analysis toolset for Java, C, C++, and Objective-C designed to detect memory leaks, null dereferences, and resource bugs. It functions as a multi-language bug finder that identifies race conditions, deadlocks, and memory safety issues by translating source code into a common intermediate representation for analysis. The project distinguishes itself through an inter-procedural data flow analyzer that tracks movement between sources and sinks to detect tainted flows and generate data flow graphs. It also includes a framework for verifying temporal properties and reachability u

PMD is a multi-language static code analyzer used to identify programming flaws, unused variables, and dead code without executing the program. It functions as a code smell detector and coding standard enforcer, ensuring source code adheres to specific naming conventions, structural requirements, and project style guides. The project features an XPath-based rule engine that allows users to define custom analysis patterns using queries against an abstract syntax tree. It also includes a copy-paste detector to identify duplicated code blocks across multiple files and a visual rule designer for

Error Prone is a static code analyzer and Java compiler extension that identifies common programming mistakes during the build process. It functions as a compiler wrapper that flags potential errors as compile-time failures to prevent bugs from reaching execution. The tool integrates directly into the Java compilation workflow to provide compile-time validation. It allows for the definition of custom linting rules and analysis checks to enforce specific coding standards and detect prohibited API usage. The system utilizes abstract syntax tree analysis and type-aware pattern matching to inspe

This project is a comprehensive development plugin for the Vim text editor, designed to transform the editor into a specialized environment for Go software development. It provides a suite of integrated tools that facilitate the entire development lifecycle, including writing, maintaining, and navigating Go source code. The plugin distinguishes itself by orchestrating external command-line binaries and language servers to perform heavy analysis, compilation, and formatting tasks as background processes. By mapping editor events to these external tools and utilizing virtual file system synchro

Larastan is a static analysis extension and type inference engine for PHP designed to detect bugs and type errors in Laravel applications. It extends PHPStan to resolve framework-specific patterns and magic methods, providing a rule-based scanning engine to audit code quality without executing the application. The tool specializes in Eloquent analysis, verifying that model properties, casts, and relationships align with database schemas and migrations. It tracks types across Eloquent collections, custom builders, and model factories to ensure type safety during database operations and iterati

Continue is an automated code review platform that integrates AI agents directly into the software development lifecycle. By executing custom validation rules against pull request diffs, it provides immediate feedback through repository status checks, allowing teams to enforce quality, security, and documentation standards before manual review begins. The system distinguishes itself through a file-based configuration model where validation logic is defined in version-controlled markdown files. These files act as system prompts that guide autonomous agents in evaluating code changes. This appr

Rector is an automated PHP refactoring and modernization tool designed to upgrade language versions and modernize syntax using predefined rules. It functions as a static analysis engine that inspects code structures and types to identify refactoring targets without executing the code. The project provides a framework for defining custom transformation logic to automate project-specific changes. It distinguishes itself by offering specialized capabilities for migrating legacy or custom frameworks to modern alternatives and converting docblock annotations into native language attributes. The s

Lighthouse is an automated diagnostic tool that evaluates web pages against industry standards for performance, accessibility, and search engine optimization. It functions as a programmatic analysis engine and a command-line utility, allowing developers to integrate comprehensive web quality checks directly into continuous integration pipelines and local development workflows. The project distinguishes itself through a modular architecture that utilizes artifact-based data collection to ensure consistent analysis across different environments. It supports a headless execution mode for automat

Phan is a static analyzer and type checker for PHP that identifies bugs and type incompatibilities without executing the code. It serves as a quality gate for continuous integration pipelines and a tool for verifying type safety, specifically checking union types, generics, and array shapes. The project is distinguished by its use of a background daemon and Language Server Protocol implementation, which provide real-time diagnostics and navigation within editors. It also features a baseline-based suppression system that allows developers to record existing errors in a snapshot file to focus e