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.

parcel-bundlerlightningcss

Features

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