parcel-bundler/lightningcss
Lightningcss
Lightning CSS is a high-performance CSS toolchain implemented in Rust. It provides a comprehensive suite of tools for stylesheet processing, including a bundler, minifier, module compiler, syntax lowerer, and vendor prefixer.
The engine utilizes a browser-grade grammar for parsing and converts stylesheets into typed property values. It distinguishes itself through a visitor-based transformation API that allows for custom modifications of the parsed abstract syntax tree and an error-tolerant parsing mechanism that recovers from malformed syntax to prevent build failures.
The toolset covers broad capability areas including cross-browser compatibility via automatic vendor prefixing and syntax lowering, stylesheet minification through property optimization, and CSS module compilation for local selector scoping. It also supports merging multiple stylesheets into a single output by resolving imports.
The toolchain generates source maps to correlate transformed output with the original source code.
Features
- CSS Toolchains - Ships a complete, high-performance CSS toolchain including a parser, transformer, and minifier implemented in Rust.
- Rust CSS Engines - Provides a high-performance, memory-safe CSS engine implemented natively in Rust.
- Typed Parsers - Converts stylesheets into typed property values for precise manipulation and optimization.
- CSS Minification - Reduces stylesheet file sizes by simplifying calculations and removing redundant code and whitespace.
- Syntax Lowering - Transpiles modern CSS features into legacy equivalents based on specified browser compatibility targets.
- CSS Grammars - Implements browser-grade grammar rules to accurately parse complex CSS property values and declarations.
- Rust-Implemented Tooling - Provides high-performance build tooling and stylesheet processing implemented in Rust for memory safety.
- AST Visitor Patterns - Utilizes the AST visitor pattern to traverse and apply custom modifications to the parsed stylesheet tree.
- Fault-Tolerant Parsing - Employs fault-tolerant parsing strategies to recover from malformed CSS syntax and prevent build failures.
- Typed Value Systems - Represents CSS values as strongly typed structures to ensure precision during optimization and manipulation.
- CSS Modules - Implements a CSS Modules compiler to scope class and ID selectors locally and prevent global style collisions.
- CSS Asset Bundling - Merges multiple stylesheets into a single output by resolving imports and optimizing style assets.
- Cross-Browser CSS Authoring - Generates browser-specific compatible syntax and vendor prefixes to ensure consistent rendering across browsers.
- CSS Bundlers - Aggregates and optimizes multiple CSS files into a single output by resolving imports.
- CSS Minifiers - Provides a high-performance minifier that reduces stylesheet size by optimizing properties, colors, and redundant rules.
- CSS Syntax Transpilation - Converts modern CSS syntax into legacy formats compatible with older browser specifications.
- High Performance - Optimizes page load times by bundling multiple stylesheets into a single, high-performance output file.
- Vendor Prefix Managers - Automates the application of browser-specific vendor prefixes to ensure cross-browser consistency.
- Shorthand Prop Expansion - Automatically expands CSS shorthand properties into longhand equivalents to optimize the final stylesheet size.
- CSS Build Tools - Provides a high-performance engine for building custom CSS transformation and parsing tools.
