mishoo/UglifyJS2
UglifyJS2
UglifyJS2 is a suite of tools designed for parsing, beautifying, mangling, and minifying JavaScript code. It functions by converting source code into an abstract syntax tree to enable programmatic analysis and transformation, and it includes a dedicated generator for creating associated source maps.
The project optimizes web production builds by compressing script logic and removing unreachable code. It utilizes name mangling to shorten variable and property names and implements a beautifier to reconstruct compressed scripts into a human-readable layout.
The toolset covers broad capability areas including abstract syntax tree transformation, logic compression, and source map composition to link minified production code back to its original source.
Features
- JavaScript Minification - Implements comprehensive JavaScript minification by removing whitespace and optimizing identifiers to reduce file size.
- Build and Bundle Optimization - Optimizes web production builds by compressing script logic and removing unreachable code to reduce bundle size.
- JavaScript Minifiers - Shrinks JavaScript files by removing whitespace and simplifying logic to reduce final bundle size.
- Recursive Descent Parsers - Implements a recursive descent parser to translate JavaScript source text into a structured syntax tree.
- Identifier Manglers - Replaces long variable and property identifiers with short sequences using a lookup table to reduce bundle size.
- AST Transformation Tools - Provides utilities for parsing and transforming JavaScript code via Abstract Syntax Trees.
- Source Map Generators - Provides utilities for creating source maps that link minified production code back to the original source files.
- JavaScript Source Parsers - Converts raw JavaScript source code into a structured data format for analysis and logic redistribution.
- Code Obfuscators - Obfuscates and shortens variable and property names to protect code and reduce the total file size.
- Abstract Syntax Tree Parsers - Provides a parser that converts JavaScript source code into an abstract syntax tree for programmatic transformation.
- Abstract Syntax Tree Tools - Provides utilities for parsing JavaScript source code into abstract syntax trees for programmatic transformation.
- Internal Tree Representations - Implements internal hierarchical tree representations of JavaScript source code to enable programmatic analysis and structural modification.
- Logic Compression - Analyzes and rewrites JavaScript code structures to remove redundant logic and shrink the final bundle size.
- Code Beautifiers - Reconstructs minified or compressed scripts into a human-readable layout using consistent indentation and spacing.
- Conditional Compilation - Replaces global constants with literal values to remove unreachable code blocks during minification.
- Constant-Folding Optimizations - Performs constant-folding evaluation to replace expressions involving constants with their final computed values during compilation.
- Property Name Manglers - Obfuscates object property names using custom rules and caches to maintain consistency across different files.
- Variable Name Manglers - Shortens variable and function names to decrease the final bundle size while preserving original program logic.
- Multi-Pass AST Traversals - Iteratively traverses the abstract syntax tree in multiple passes to simplify expressions and remove unreachable code.
- Build and Transpilation Tools - JavaScript parser, minifier, and compressor.
