Scalafix – refactoring and linting tool for Scala

Scalafix is a refactoring and linting tool for Scala.

It provides a framework for detecting problematic source constructs as well as applying automated rewrites, making it useful for both code-quality enforcement and large-scale source migrations. Rules can operate purely on syntax or use semantic information supplied by SemanticDB, allowing analysis based on symbols and types when deeper knowledge of a program is required. Scalafix can be used with its built-in rules or extended with rules created by individual projects and the wider Scala community.

This is free and open source software.

Key Features

• Supports both linter rules, which report diagnostics, and rewrite rules, which modify source code.
• Provides syntactic rules that can inspect source code without compiling it first.
• Offers semantic rules with access to symbols, types and other compiler-derived information through SemanticDB.
• Includes rules for organising imports, removing unused code and adding explicit result types.
• Can prohibit selected Scala constructs including variables, nulls, exceptions, returns, loops and unsafe type casts.
• Supports project configuration through a .scalafix.conf file using HOCON syntax.
• Allows external rules to be distributed as dependencies and loaded alongside the built-in rule set.
• Supports local project-specific rules for checks and transformations that do not need to be published separately.
• Can check whether files require changes without modifying them, making it suitable for continuous integration workflows.
• Can restrict processing to files changed relative to a Git branch, commit or tag.
• Provides an API for developing configurable syntactic and semantic rules, diagnostics and source-code patches.

Website: github.com/scalacenter/scalafix
Support:
Developer: Scala Center and contributors
License: BSD 3-Clause “New” or “Revised” License

Scalafix is written in Scala. Learn Scala with our recommended free books and free tutorials.

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