Code Transformation

BabelTypeScript

A JavaScript compiler that transforms modern JavaScript code into backwards-compatible versions for older environments.

AcornJavaScript

A tiny, fast JavaScript parser written entirely in JavaScript, designed for extensibility.

AcornJavaScript

A tiny, fast JavaScript parser written completely in JavaScript, designed for extensibility.

Traceur compilerJavaScript

A JavaScript.next-to-JavaScript-of-today compiler that lets you use future ECMAScript features in current environments.

RecastTypeScript

A JavaScript syntax tree transformer that preserves original formatting and generates source maps automatically.

SpoonJava

A metaprogramming library for analyzing and transforming Java source code via a well-designed AST.

UndebtPython

A fast, straightforward, reliable tool for performing massive, automated code refactoring using custom Python patterns.

denoifyTypeScript

A build tool that enables NPM module authors to support Deno from a single TypeScript codebase without maintaining a separate port.

cilOCaml

A front-end for the C programming language that simplifies code for analysis and transformation.

De MorganTypeScript

An ESLint plugin that enforces logical consistency by transforming negated boolean expressions using De Morgan's laws.

Error Prone SupportJava

A Picnic-opinionated extension of Google's Error Prone, adding extra bug checkers and a large battery of Refaster rules for Java.

darkluaRust

A command line tool that transforms Lua 5.1 and Roblox Luau code using configurable rules.

riddleyClojure

A Clojure library for correct code walking and macroexpansion that preserves binding information and expands inlined functions.

Elixir RefactoringsElixir

A comprehensive catalog of 82 refactoring strategies for Elixir code, categorized by language-specific, traditional, functional, and Erlang-specific transformations.

let-erJavaScript

Transpiles let-block syntax (let (..) {..}) to ES6 or ES3 for block-scoping support in older JavaScript environments.

esparseJavaScript

A clear, extensible JavaScript parser with a beautiful codebase and easy-to-manipulate AST.

astyGo

Converts Go AST to JSON and back, enabling cross-language analysis and transformation of Go code.

babel-plugin-graphqlJavaScript

Babel plugin that compiles GraphQL tagged template strings into JavaScript objects at build time.