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The css-tree npm package is a tool for parsing and manipulating CSS. It allows users to parse CSS strings into an abstract syntax tree (AST), walk over nodes in the tree, generate CSS strings, and more. It is useful for tasks such as CSS minification, linting, and transformation.
Parsing CSS to AST
This feature allows you to parse a CSS string and convert it into an abstract syntax tree (AST) for further manipulation or analysis.
const csstree = require('css-tree');
const ast = csstree.parse('.example { color: red; }');
Walking the AST
This feature enables you to traverse the AST and apply functions or extract information from specific nodes.
csstree.walk(ast, function(node) {
if (node.type === 'ClassSelector') {
console.log(node.name);
}
});
Generating CSS from AST
After manipulating the AST, you can generate a CSS string from the modified AST, which can be used in stylesheets or injected into web pages.
const modifiedAST = csstree.parse('.example { color: blue; }');
const css = csstree.generate(modifiedAST);
Minifying CSS
css-tree can be used to minify CSS by parsing it with compression options and then translating the AST back to a CSS string.
const compressedCSS = csstree.translate(csstree.parse('.example { color: red; }', { compress: true }));
PostCSS is a tool for transforming CSS with JavaScript plugins. It can do similar tasks as css-tree, such as parsing, walking the AST, and generating CSS. PostCSS is plugin-based, which makes it more extensible and allows for a wide range of transformations.
Sass is a preprocessor scripting language that is interpreted or compiled into CSS. It offers more syntactic features compared to css-tree, such as variables, nesting, and mixins, but it is not primarily focused on parsing and manipulating existing CSS.
Less is another CSS pre-processor, similar to Sass, that extends the capabilities of CSS with dynamic behavior such as variables, mixins, operations, and functions. Less and css-tree serve different purposes, with Less focusing on writing CSS in a more functional way and css-tree on parsing and manipulation.
clean-css is a fast and efficient CSS optimizer for Node.js and the browser. It focuses on minification, which is one of the features of css-tree, but does not provide a general-purpose CSS parsing and manipulation API.
1.0.0-alpha.39 (December 5, 2019)
visit: "Declaration"
to iterate DeclarationList
(#114)FAQs
A tool set for CSS: fast detailed parser (CSS → AST), walker (AST traversal), generator (AST → CSS) and lexer (validation and matching) based on specs and browser implementations
The npm package css-tree receives a total of 32,789,940 weekly downloads. As such, css-tree popularity was classified as popular.
We found that css-tree demonstrated a healthy version release cadence and project activity because the last version was released less than a year ago. It has 2 open source maintainers collaborating on the project.
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