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<!DOCTYPE html><html class="default" lang="en" data-base="../"><head><meta charset="utf-8"/><meta http-equiv="x-ua-compatible" content="IE=edge"/><title>README | @tbela99/css-parser</title><meta name="description" content="Documentation for @tbela99/css-parser"/><meta name="viewport" content="width=device-width, initial-scale=1"/><link rel="stylesheet" href="../assets/style.css"/><link rel="stylesheet" href="../assets/highlight.css"/><script defer src="../assets/main.js"></script><script async src="../assets/icons.js" id="tsd-icons-script"></script><script async src="../assets/search.js" id="tsd-search-script"></script><script async src="../assets/navigation.js" id="tsd-nav-script"></script><script async src="../assets/hierarchy.js" id="tsd-hierarchy-script"></script><style>
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</style><link rel="stylesheet" href="../assets/material-style.css"/></head><body><script>document.documentElement.dataset.theme = localStorage.getItem("tsd-theme") || "os";document.body.style.display="none";setTimeout(() => window.app?app.showPage():document.body.style.removeProperty("display"),500)</script><header class="tsd-page-toolbar"><div class="tsd-toolbar-contents container"><a href="../index.html" class="title">@tbela99/css-parser</a><div id="tsd-toolbar-links"><a href="https://tbela99.github.io/css-parser/benchmark/index.html">Benchmark</a><a href="https://tbela99.github.io/css-parser/docs/">Docs</a><a href="https://tbela99.github.io/css-parser/playground/">Playground</a><a href="https://github.com/tbela99/css-parser">GitHub</a></div><button id="tsd-search-trigger" class="tsd-widget" aria-label="Search"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-search"></use></svg></button><dialog id="tsd-search" aria-label="Search"><input role="combobox" id="tsd-search-input" aria-controls="tsd-search-results" aria-autocomplete="list" aria-expanded="true" autocapitalize="off" autocomplete="off" placeholder="Search the docs" maxLength="100"/><ul role="listbox" id="tsd-search-results"></ul><div id="tsd-search-status" aria-live="polite" aria-atomic="true"><div>Preparing search index...</div></div></dialog><a href="#" class="tsd-widget menu" id="tsd-toolbar-menu-trigger" data-toggle="menu" aria-label="Menu"><svg width="16" height="16" viewBox="0 0 16 16" fill="none" aria-hidden="true"><use href="../assets/icons.svg#icon-menu"></use></svg></a></div></header><div class="container container-main"><div class="col-content"><div class="tsd-page-title"><ul class="tsd-breadcrumb" aria-label="Breadcrumb"><li><a href="" aria-current="page">README</a></li></ul></div><div class="tsd-panel tsd-typography"><p><a href="https://tbela99.github.io/css-parser/playground/"><img src="https://img.shields.io/badge/playground-try%20it%20now-%230a7398" alt="playground"></a> <a href="https://www.npmjs.com/package/@tbela99/css-parser"><img src="https://img.shields.io/badge/dynamic/json?url=https%3A%2F%2Fraw.githubusercontent.com%2Ftbela99%2Fcss-parser%2Fmaster%2Fpackage.json&query=version&logo=npm&label=npm&link=https%3A%2F%2Fwww.npmjs.com%2Fpackage%2F%40tbela99%2Fcss-parser" alt="npm"></a> <a href="https://jsr.io/@tbela99/css-parser"><img src="https://img.shields.io/jsr/v/%40tbela99/css-parser?link=https%3A%2F%2Fjsr.io%2F%40tbela99%2Fcss-parser" alt="npm"></a> <a href="https://github.com/tbela99/css-parser/actions"><img src="https://tbela99.github.io/css-parser/badges/coverage.svg" alt="cov"></a> <a href="https://tbela99.github.io/css-parser/docs"><img src="https://img.shields.io/badge/online-documentation-blue" alt="Doc"></a> <a href="https://www.npmjs.com/package/@tbela99/css-parser"><img src="https://img.shields.io/npm/dm/%40tbela99%2Fcss-parser" alt="NPM Downloads"></a> <a href="https://www.npmjs.com/package/@tbela99/css-parser"><img src="https://img.shields.io/bundlejs/size/%40tbela99/css-parser%400.9.0?exports=cjs" alt="bundle size"></a></p>
<h1 id="css-parser" class="tsd-anchor-link">css-parser<a href="#css-parser" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h1><p>CSS parser and minifier for node and the browser</p>
<h2 id="installation" class="tsd-anchor-link">Installation<a href="#installation" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>From npm</p>
<pre><code class="shell"><span class="hl-0">$</span><span class="hl-1"> </span><span class="hl-2">npm</span><span class="hl-1"> </span><span class="hl-2">install</span><span class="hl-1"> </span><span class="hl-2">@tbela99/css-parser</span>
</code><button type="button">Copy</button></pre>
<p>from jsr</p>
<pre><code class="shell"><span class="hl-0">$</span><span class="hl-1"> </span><span class="hl-2">deno</span><span class="hl-1"> </span><span class="hl-2">add</span><span class="hl-1"> </span><span class="hl-2">@tbela99/css-parser</span>
</code><button type="button">Copy</button></pre>
<h2 id="features" class="tsd-anchor-link">Features<a href="#features" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul>
<li>no dependency</li>
<li>CSS validation based upon mdn-data</li>
<li>fault-tolerant parser, will try to fix invalid tokens according to the CSS syntax module 3 recommendations.</li>
<li>fast and efficient minification without unsafe transforms,
see <a href="https://tbela99.github.io/css-parser/benchmark/index.html">benchmark</a></li>
<li>minify colors: color(), lab(), lch(), oklab(), oklch(), color-mix(), light-dark(), system colors and
relative color</li>
<li>generate nested css rules</li>
<li>convert nested css rules to legacy syntax</li>
<li>convert colors to any supported color format</li>
<li>generate sourcemap</li>
<li>compute css shorthands. see supported properties list below</li>
<li>minify css transform functions</li>
<li>evaluate math functions: calc(), clamp(), min(), max(), etc.</li>
<li>inline css variables</li>
<li>remove duplicate properties</li>
<li>flatten @import rules</li>
<li>experimental CSS prefix removal</li>
</ul>
<h2 id="playground" class="tsd-anchor-link">Playground<a href="#playground" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Try it <a href="https://tbela99.github.io/css-parser/playground/">online</a></p>
<h2 id="exports" class="tsd-anchor-link">Exports<a href="#exports" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>There are several ways to import the library into your application.</p>
<h3 id="node-exports" class="tsd-anchor-link">Node exports<a href="#node-exports" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>import as a module</p>
<pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-5">// ...</span>
</code><button type="button">Copy</button></pre>
<h3 id="deno-exports" class="tsd-anchor-link">Deno exports<a href="#deno-exports" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>import as a module</p>
<pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-5">// ...</span>
</code><button type="button">Copy</button></pre>
<p>import as a CommonJS module</p>
<pre><code class="javascript"><br/><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">transform</span><span class="hl-1">} = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">'@tbela99/css-parser/cjs'</span><span class="hl-1">);</span><br/><br/><span class="hl-5">// ...</span>
</code><button type="button">Copy</button></pre>
<h3 id="web-export" class="tsd-anchor-link">Web export<a href="#web-export" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Programmatic import</p>
<pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser/web'</span><span class="hl-1">;</span><br/><br/><span class="hl-5">// ...</span>
</code><button type="button">Copy</button></pre>
<p>Javascript module from cdn</p>
<pre><code class="html"><br/><span class="hl-8"><</span><span class="hl-9">script</span><span class="hl-10"> </span><span class="hl-11">type</span><span class="hl-10">=</span><span class="hl-12">"module"</span><span class="hl-8">></span><br/><br/><span class="hl-10"> </span><span class="hl-3">import</span><span class="hl-10"> {</span><span class="hl-4">transform</span><span class="hl-10">} </span><span class="hl-3">from</span><span class="hl-10"> </span><span class="hl-2">'https://esm.sh/@tbela99/css-parser@1.3.1/web'</span><span class="hl-10">;</span><br/><br/><br/><span class="hl-10"> </span><span class="hl-6">const</span><span class="hl-10"> </span><span class="hl-7">css</span><span class="hl-10"> </span><span class="hl-1">=</span><span class="hl-10"> </span><span class="hl-2">`</span><br/><span class="hl-2"> .s {</span><br/><br/><span class="hl-2"> background: color-mix(in hsl, color(display-p3 0 1 0) 80%, yellow);</span><br/><span class="hl-2">}</span><br/><span class="hl-2"> `</span><span class="hl-10">;</span><br/><br/><span class="hl-10"> </span><span class="hl-4">console</span><span class="hl-10">.</span><span class="hl-0">debug</span><span class="hl-10">(</span><span class="hl-3">await</span><span class="hl-10"> </span><span class="hl-0">transform</span><span class="hl-10">(</span><span class="hl-4">css</span><span class="hl-10">).</span><span class="hl-0">then</span><span class="hl-10">(</span><span class="hl-4">r</span><span class="hl-10"> </span><span class="hl-6">=></span><span class="hl-10"> </span><span class="hl-4">r</span><span class="hl-10">.</span><span class="hl-4">code</span><span class="hl-10">));</span><br/><br/><span class="hl-8"></</span><span class="hl-9">script</span><span class="hl-8">></span>
</code><button type="button">Copy</button></pre>
<p>Javascript module</p>
<pre><code class="javascript"><br/><span class="hl-8"><</span><span class="hl-9">script</span><span class="hl-1"> </span><span class="hl-11">src</span><span class="hl-1">=</span><span class="hl-2">"dist/web.js"</span><span class="hl-1"> </span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"module"</span><span class="hl-8">></</span><span class="hl-9">script</span><span class="hl-8">></span>
</code><button type="button">Copy</button></pre>
<p>Single Javascript file</p>
<pre><code class="javascript"><br/><span class="hl-8"><</span><span class="hl-9">script</span><span class="hl-1"> </span><span class="hl-11">src</span><span class="hl-1">=</span><span class="hl-2">"dist/index-umd-web.js"</span><span class="hl-8">></</span><span class="hl-9">script</span><span class="hl-8">></span>
</code><button type="button">Copy</button></pre>
<h2 id="transform" class="tsd-anchor-link">Transform<a href="#transform" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Parse and render css in a single pass.</p>
<h3 id="usage" class="tsd-anchor-link">Usage<a href="#usage" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="typescript"><br/><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">: </span><span class="hl-4">string</span><span class="hl-1"> | </span><span class="hl-4">ReadableStream</span><span class="hl-1"><</span><span class="hl-4">string</span><span class="hl-1">>, </span><span class="hl-4">transformOptions</span><span class="hl-1">: </span><span class="hl-4">TransformOptions</span><span class="hl-1"> = {}): </span><span class="hl-4">TransformResult</span><br/><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">: </span><span class="hl-4">string</span><span class="hl-1"> | </span><span class="hl-4">ReadableStream</span><span class="hl-1"><</span><span class="hl-4">string</span><span class="hl-1">>, </span><span class="hl-4">parseOptions</span><span class="hl-1">: </span><span class="hl-4">ParseOptions</span><span class="hl-1"> = {}): </span><span class="hl-4">ParseResult</span><span class="hl-1">;</span><br/><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">ast</span><span class="hl-1">: </span><span class="hl-4">AstNode</span><span class="hl-1">, </span><span class="hl-4">renderOptions</span><span class="hl-1">: </span><span class="hl-4">RenderOptions</span><span class="hl-1"> = {}): </span><span class="hl-4">RenderResult</span><span class="hl-1">;</span>
</code><button type="button">Copy</button></pre>
<h3 id="example" class="tsd-anchor-link">Example<a href="#example" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">ast</span><span class="hl-1">, </span><span class="hl-7">code</span><span class="hl-1">, </span><span class="hl-7">map</span><span class="hl-1">, </span><span class="hl-7">errors</span><span class="hl-1">, </span><span class="hl-7">stats</span><span class="hl-1">} = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">, </span><span class="hl-4">resolveImport:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">, </span><span class="hl-4">cwd:</span><span class="hl-1"> </span><span class="hl-2">'files/css'</span><span class="hl-1">});</span>
</code><button type="button">Copy</button></pre>
<h3 id="example-1" class="tsd-anchor-link">Example<a href="#example-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Read from stdin with node using readable stream</p>
<pre><code class="typescript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/node"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">Readable</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"node:stream"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> </span><span class="hl-3">type</span><span class="hl-1"> {</span><span class="hl-4">TransformResult</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'../src/@types/index.d.ts'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">readableStream</span><span class="hl-1">: </span><span class="hl-13">ReadableStream</span><span class="hl-1"><</span><span class="hl-13">string</span><span class="hl-1">> = </span><span class="hl-4">Readable</span><span class="hl-1">.</span><span class="hl-0">toWeb</span><span class="hl-1">(</span><span class="hl-4">process</span><span class="hl-1">.</span><span class="hl-4">stdin</span><span class="hl-1">) </span><span class="hl-3">as</span><span class="hl-1"> </span><span class="hl-13">ReadableStream</span><span class="hl-1"><</span><span class="hl-13">string</span><span class="hl-1">>;</span><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">result</span><span class="hl-1">: </span><span class="hl-13">TransformResult</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">readableStream</span><span class="hl-1">, {</span><span class="hl-4">beautify:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">});</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">log</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">code</span><span class="hl-1">);</span>
</code><button type="button">Copy</button></pre>
<h3 id="transformoptions" class="tsd-anchor-link">TransformOptions<a href="#transformoptions" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Include ParseOptions and RenderOptions</p>
<h4 id="parseoptions" class="tsd-anchor-link">ParseOptions<a href="#parseoptions" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h4><blockquote>
<p>Minify Options</p>
</blockquote>
<ul>
<li>minify: boolean, optional. default to <em>true</em>. optimize ast.</li>
<li>pass: number, optional. minification pass. default to 1</li>
<li>nestingRules: boolean, optional. automatically generated nested rules.</li>
<li>expandNestingRules: boolean, optional. convert nesting rules into separate rules. will automatically set nestingRules
to false.</li>
<li>removeDuplicateDeclarations: boolean, optional. remove duplicate declarations.</li>
<li>computeTransform: boolean, optional. compute css transform functions.</li>
<li>computeShorthand: boolean, optional. compute shorthand properties.</li>
<li>computeCalcExpression: boolean, optional. evaluate calc() expression</li>
<li>inlineCssVariables: boolean, optional. replace some css variables with their actual value. they must be declared once
in the :root {} or html {} rule.</li>
<li>removeEmpty: boolean, optional. remove empty rule lists from the ast.</li>
</ul>
<blockquote>
<p>CSS Prefix Removal Options</p>
</blockquote>
<ul>
<li>removePrefix: boolean, optional. remove CSS prefixes.</li>
</ul>
<blockquote>
<p>Validation Options</p>
</blockquote>
<ul>
<li>validation: ValidationLevel | boolean, optional. enable validation. permitted values are:
<ul>
<li>ValidationLevel.None: no validation</li>
<li>ValidationLevel.Default: validate selectors and at-rules (default)</li>
<li>ValidationLevel.All. validate all nodes</li>
<li>true: same as ValidationLevel.All.</li>
<li>false: same as ValidationLevel.None</li>
</ul>
</li>
<li>lenient: boolean, optional. preserve invalid tokens.</li>
</ul>
<blockquote>
<p>Sourcemap Options</p>
</blockquote>
<ul>
<li>src: string, optional. original css file location to be used with sourcemap, also used to resolve url().</li>
<li>sourcemap: boolean, optional. preserve node location data.</li>
</ul>
<blockquote>
<p>Ast Traversal Options</p>
</blockquote>
<ul>
<li>visitor: VisitorNodeMap, optional. node visitor used to transform the ast.</li>
</ul>
<blockquote>
<p>Urls and @import Options</p>
</blockquote>
<ul>
<li>resolveImport: boolean, optional. replace @import rule by the content of the referenced stylesheet.</li>
<li>resolveUrls: boolean, optional. resolve css 'url()' according to the parameters 'src' and 'cwd'</li>
</ul>
<blockquote>
<p>Misc Options</p>
</blockquote>
<ul>
<li>removeCharset: boolean, optional. remove @charset.</li>
<li>cwd: string, optional. destination directory used to resolve url().</li>
<li>signal: AbortSignal, optional. abort parsing.</li>
</ul>
<h4 id="renderoptions" class="tsd-anchor-link">RenderOptions<a href="#renderoptions" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h4><blockquote>
<p>Minify Options</p>
</blockquote>
<ul>
<li>beautify: boolean, optional. default to <em>false</em>. beautify css output.</li>
<li>minify: boolean, optional. default to <em>true</em>. minify css values.</li>
<li>withParents: boolean, optional. render this node and its parents.</li>
<li>removeEmpty: boolean, optional. remove empty rule lists from the ast.</li>
<li>expandNestingRules: boolean, optional. expand nesting rules.</li>
<li>preserveLicense: boolean, force preserving comments starting with '/*!' when minify is enabled.</li>
<li>removeComments: boolean, remove comments in generated css.</li>
<li>convertColor: boolean | ColorType, convert colors to the specified color. default to ColorType.HEX. supported values are:
<ul>
<li>true: same as ColorType.HEX</li>
<li>false: no color conversion</li>
<li>ColorType.HEX</li>
<li>ColorType.RGB or ColorType.RGBA</li>
<li>ColorType.HSL</li>
<li>ColorType.HWB</li>
<li>ColorType.CMYK or ColorType.DEVICE_CMYK</li>
<li>ColorType.SRGB</li>
<li>ColorType.SRGB_LINEAR</li>
<li>ColorType.DISPLAY_P3</li>
<li>ColorType.PROPHOTO_RGB</li>
<li>ColorType.A98_RGB</li>
<li>ColorType.REC2020</li>
<li>ColorType.XYZ or ColorType.XYZ_D65</li>
<li>ColorType.XYZ_D50</li>
<li>ColorType.LAB</li>
<li>ColorType.LCH</li>
<li>ColorType.OKLAB</li>
<li>ColorType.OKLCH</li>
</ul>
</li>
</ul>
<blockquote>
<p>Sourcemap Options</p>
</blockquote>
<ul>
<li>sourcemap: boolean | 'inline', optional. generate sourcemap.</li>
</ul>
<blockquote>
<p>Misc Options</p>
</blockquote>
<ul>
<li>indent: string, optional. css indention string. uses space character by default.</li>
<li>newLine: string, optional. new line character.</li>
<li>output: string, optional. file where to store css. url() are resolved according to the specified value. no file is
created though.</li>
<li>cwd: string, optional. destination directory used to resolve url().</li>
</ul>
<h2 id="parsing" class="tsd-anchor-link">Parsing<a href="#parsing" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><h3 id="usage-1" class="tsd-anchor-link">Usage<a href="#usage-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">parseOptions</span><span class="hl-1"> = {})</span>
</code><button type="button">Copy</button></pre>
<h3 id="example-2" class="tsd-anchor-link">Example<a href="#example-2" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">ast</span><span class="hl-1">, </span><span class="hl-7">errors</span><span class="hl-1">, </span><span class="hl-7">stats</span><span class="hl-1">} = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">);</span>
</code><button type="button">Copy</button></pre>
<h2 id="rendering" class="tsd-anchor-link">Rendering<a href="#rendering" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><h3 id="usage-2" class="tsd-anchor-link">Usage<a href="#usage-2" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">ast</span><span class="hl-1">, </span><span class="hl-4">RenderOptions</span><span class="hl-1"> = {});</span>
</code><button type="button">Copy</button></pre>
<h3 id="examples" class="tsd-anchor-link">Examples<a href="#examples" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Rendering ast</p>
<pre><code class="javascript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><span class="hl-2">@media screen and (min-width: 40em) {</span><br/><span class="hl-2"> .featurette-heading {</span><br/><span class="hl-2"> font-size: 50px;</span><br/><span class="hl-2"> }</span><br/><span class="hl-2"> .a {</span><br/><span class="hl-2"> color: red;</span><br/><span class="hl-2"> width: 3px;</span><br/><span class="hl-2"> }</span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">result</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">);</span><br/><br/><span class="hl-5">// print declaration without parents</span><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">error</span><span class="hl-1">(</span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">.</span><span class="hl-4">chi</span><span class="hl-1">[</span><span class="hl-14">0</span><span class="hl-1">].</span><span class="hl-4">chi</span><span class="hl-1">[</span><span class="hl-14">1</span><span class="hl-1">].</span><span class="hl-4">chi</span><span class="hl-1">[</span><span class="hl-14">1</span><span class="hl-1">], {</span><span class="hl-4">withParents:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}));</span><br/><span class="hl-5">// -> width:3px</span><br/><br/><span class="hl-5">// print declaration with parents</span><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">.</span><span class="hl-4">chi</span><span class="hl-1">[</span><span class="hl-14">0</span><span class="hl-1">].</span><span class="hl-4">chi</span><span class="hl-1">[</span><span class="hl-14">1</span><span class="hl-1">].</span><span class="hl-4">chi</span><span class="hl-1">[</span><span class="hl-14">1</span><span class="hl-1">], {</span><span class="hl-4">withParents:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">}));</span><br/><span class="hl-5">// -> @media screen and (min-width:40em){.a{width:3px}}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="convert-colors" class="tsd-anchor-link">Convert colors<a href="#convert-colors" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">, </span><span class="hl-4">ColorType</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><span class="hl-2">.hsl { color: #b3222280; }</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">result</span><span class="hl-1">: </span><span class="hl-13">TransformResult</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, {</span><br/><span class="hl-1"> </span><span class="hl-4">beautify:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">convertColor:</span><span class="hl-1"> </span><span class="hl-4">ColorType</span><span class="hl-1">.</span><span class="hl-7">SRGB</span><br/><span class="hl-1">});</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">log</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">css</span><span class="hl-1">);</span><br/>
</code><button type="button">Copy</button></pre>
<p>result</p>
<pre><code class="css"><span class="hl-15">.hsl</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-0">color</span><span class="hl-1">(</span><span class="hl-16">srgb</span><span class="hl-1"> </span><span class="hl-14">.7019607843137254</span><span class="hl-1"> </span><span class="hl-14">.13333333333333333</span><span class="hl-1"> </span><span class="hl-14">.13333333333333333</span><span class="hl-1">/</span><span class="hl-14">50%</span><span class="hl-1">)</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h3 id="merge-similar-rules" class="tsd-anchor-link">Merge similar rules<a href="#merge-similar-rules" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>CSS</p>
<pre><code class="css"><br/><span class="hl-15">.clear</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">width</span><span class="hl-1">: </span><span class="hl-14">0</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">height</span><span class="hl-1">: </span><span class="hl-14">0</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-16">transparent</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.clearfix:before</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-11">height</span><span class="hl-1">: </span><span class="hl-14">0</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">width</span><span class="hl-1">: </span><span class="hl-14">0</span><span class="hl-1">;</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">result</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">);</span><br/>
</code><button type="button">Copy</button></pre>
<p>Result</p>
<pre><code class="css"><span class="hl-15">.clear</span><span class="hl-1">, </span><span class="hl-15">.clearfix:before</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">height</span><span class="hl-1">: </span><span class="hl-14">0</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">width</span><span class="hl-1">: </span><span class="hl-14">0</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.clear</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-16">#0000</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h3 id="automatic-css-nesting" class="tsd-anchor-link">Automatic CSS Nesting<a href="#automatic-css-nesting" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>CSS</p>
<pre><code class="javascript"><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">parse</span><span class="hl-1">, </span><span class="hl-7">render</span><span class="hl-1">} = </span><span class="hl-0">require</span><span class="hl-1">(</span><span class="hl-2">"@tbela99/css-parser/cjs"</span><span class="hl-1">);</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><span class="hl-2">table.colortable td {</span><br/><span class="hl-2"> text-align:center;</span><br/><span class="hl-2">}</span><br/><span class="hl-2">table.colortable td.c {</span><br/><span class="hl-2"> text-transform:uppercase;</span><br/><span class="hl-2">}</span><br/><span class="hl-2">table.colortable td:first-child, table.colortable td:first-child+td {</span><br/><span class="hl-2"> border:1px solid black;</span><br/><span class="hl-2">}</span><br/><span class="hl-2">table.colortable th {</span><br/><span class="hl-2"> text-align:center;</span><br/><span class="hl-2"> background:black;</span><br/><span class="hl-2"> color:white;</span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">result</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, {</span><span class="hl-4">nestingRules:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">}).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}).</span><span class="hl-4">code</span><span class="hl-1">);</span>
</code><button type="button">Copy</button></pre>
<p>Result</p>
<pre><code class="css"><span class="hl-15">table.colortable</span><span class="hl-1"> {</span><br/><span class="hl-1"> & td {</span><br/><span class="hl-1"> </span><span class="hl-11">text-align</span><span class="hl-1">: </span><span class="hl-16">center</span><span class="hl-1">;</span><br/><br/><span class="hl-1"> &.c {</span><br/><span class="hl-1"> </span><span class="hl-11">text-transform</span><span class="hl-1">: </span><span class="hl-16">uppercase</span><br/><span class="hl-1"> }</span><br/><br/><span class="hl-1"> &</span><span class="hl-15">:first-child</span><span class="hl-1">, &</span><span class="hl-15">:first-child</span><span class="hl-1"> + </span><span class="hl-15">td</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">border</span><span class="hl-1">: </span><span class="hl-14">1px</span><span class="hl-1"> </span><span class="hl-16">solid</span><span class="hl-1"> </span><span class="hl-16">#000</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><br/><span class="hl-1"> & </span><span class="hl-15">th</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">text-align</span><span class="hl-1">: </span><span class="hl-16">center</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">background</span><span class="hl-1">: </span><span class="hl-16">#000</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-16">#fff</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h3 id="css-validation" class="tsd-anchor-link">CSS Validation<a href="#css-validation" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>CSS</p>
<pre><code class="css"><br/><span class="hl-17">#404</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1">, </span><span class="hl-17">#404</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> {</span><br/><span class="hl-1"> --animate-duration: 1s;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-1">.s [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1">]]</span><br/><span class="hl-1">{</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1">] {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-6">i</span><span class="hl-1">] {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-11">s</span><span class="hl-1">]</span><br/><span class="hl-1">{</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><br/><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-11">b</span><span class="hl-1">]</span><br/><span class="hl-1">{</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-11">b</span><span class="hl-1">],{</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><br/><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-11">b</span><span class="hl-1">]</span><br/><span class="hl-1">+ {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-11">b</span><span class="hl-1">]</span><br/><span class="hl-1">+ </span><span class="hl-15">b</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1"> </span><span class="hl-6">i</span><span class="hl-1">] + </span><span class="hl-15">b</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><br/><span class="hl-15">.s</span><span class="hl-1"> [</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">"text"</span><span class="hl-1">())]{</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><span class="hl-17">.s(</span><span class="hl-1">){</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><span class="hl-15">.s:focus</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><span class="hl-1">;</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<p>with validation enabled</p>
<pre><code class="javascript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1"> = {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">, </span><span class="hl-4">validate:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">};</span><br/><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">code</span><span class="hl-1">} = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}));</span><br/><span class="hl-5">//</span><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-4">code</span><span class="hl-1">);</span>
</code><button type="button">Copy</button></pre>
<pre><code class="css"><span class="hl-15">.s:is</span><span class="hl-1">([</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-6">i</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-11">s</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-6">i</span><span class="hl-1">]+</span><span class="hl-15">b</span><span class="hl-1">,</span><span class="hl-15">:focus</span><span class="hl-1">) {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<p>with validation disabled</p>
<pre><code class="javascript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1"> = {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">, </span><span class="hl-4">validate:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">};</span><br/><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">code</span><span class="hl-1">} = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}));</span><br/><span class="hl-5">//</span><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-4">code</span><span class="hl-1">);</span>
</code><button type="button">Copy</button></pre>
<pre><code class="css"><span class="hl-15">.s:is</span><span class="hl-1">([</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-6">i</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-11">s</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-11">b</span><span class="hl-1">],[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-11">b</span><span class="hl-1">]+</span><span class="hl-15">b</span><span class="hl-1">,[</span><span class="hl-11">type</span><span class="hl-1">=</span><span class="hl-2">text</span><span class="hl-1"> </span><span class="hl-6">i</span><span class="hl-1">]+</span><span class="hl-15">b</span><span class="hl-1">,</span><span class="hl-15">:focus</span><span class="hl-1">) {</span><br/><span class="hl-1"> </span><span class="hl-11">--animate-duration</span><span class="hl-1">: </span><span class="hl-14">1s</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h3 id="nested-css-expansion" class="tsd-anchor-link">Nested CSS Expansion<a href="#nested-css-expansion" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>CSS</p>
<pre><code class="css"><span class="hl-15">table.colortable</span><span class="hl-1"> {</span><br/><span class="hl-1"> & td {</span><br/><span class="hl-1"> </span><span class="hl-11">text-align</span><span class="hl-1">: </span><span class="hl-16">center</span><span class="hl-1">;</span><br/><br/><span class="hl-1"> &.c {</span><br/><span class="hl-1"> </span><span class="hl-11">text-transform</span><span class="hl-1">: </span><span class="hl-16">uppercase</span><br/><span class="hl-1"> }</span><br/><br/><span class="hl-1"> &</span><span class="hl-15">:first-child</span><span class="hl-1">, &</span><span class="hl-15">:first-child</span><span class="hl-1"> + </span><span class="hl-15">td</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">border</span><span class="hl-1">: </span><span class="hl-14">1px</span><span class="hl-1"> </span><span class="hl-16">solid</span><span class="hl-1"> </span><span class="hl-16">#000</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><br/><span class="hl-1"> & </span><span class="hl-15">th</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">text-align</span><span class="hl-1">: </span><span class="hl-16">center</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">background</span><span class="hl-1">: </span><span class="hl-16">#000</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-16">#fff</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<p>Javascript</p>
<pre><code class="javascript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1"> = {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">};</span><br/><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">code</span><span class="hl-1">} = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">, </span><span class="hl-4">expandNestingRules:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">}));</span><br/><span class="hl-5">//</span><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-4">code</span><span class="hl-1">);</span>
</code><button type="button">Copy</button></pre>
<p>Result</p>
<pre><code class="css"><br/><span class="hl-15">table.colortable</span><span class="hl-1"> </span><span class="hl-15">td</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">text-align</span><span class="hl-1">: </span><span class="hl-16">center</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">table.colortable</span><span class="hl-1"> </span><span class="hl-15">td.c</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">text-transform</span><span class="hl-1">: </span><span class="hl-16">uppercase</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">table.colortable</span><span class="hl-1"> </span><span class="hl-15">td:first-child</span><span class="hl-1">, </span><span class="hl-15">table.colortable</span><span class="hl-1"> </span><span class="hl-15">td:first-child</span><span class="hl-1"> + </span><span class="hl-15">td</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">border</span><span class="hl-1">: </span><span class="hl-14">1px</span><span class="hl-1"> </span><span class="hl-16">solid</span><span class="hl-1"> </span><span class="hl-16">black</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">table.colortable</span><span class="hl-1"> </span><span class="hl-15">th</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">text-align</span><span class="hl-1">: </span><span class="hl-16">center</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">background</span><span class="hl-1">: </span><span class="hl-16">black</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-16">white</span><span class="hl-1">;</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h3 id="calc-resolution" class="tsd-anchor-link">Calc() resolution<a href="#calc-resolution" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><span class="hl-2">a {</span><br/><br/><span class="hl-2">width: calc(100px * log(625, 5));</span><br/><span class="hl-2">}</span><br/><span class="hl-2">.foo-bar {</span><br/><span class="hl-2"> width: calc(100px * 2);</span><br/><span class="hl-2"> height: calc(((75.37% - 63.5px) - 900px) + (2 * 100px));</span><br/><span class="hl-2"> max-width: calc(3.5rem + calc(var(--bs-border-width) * 2));</span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">prettyPrint</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}).</span><span class="hl-4">code</span><span class="hl-1">);</span><br/>
</code><button type="button">Copy</button></pre>
<p>result</p>
<pre><code class="css"><span class="hl-15">a</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">width</span><span class="hl-1">: </span><span class="hl-14">400px</span><span class="hl-1">;</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-15">.foo-bar</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">width</span><span class="hl-1">: </span><span class="hl-14">200px</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">height</span><span class="hl-1">: </span><span class="hl-0">calc</span><span class="hl-1">(</span><span class="hl-14">75.37%</span><span class="hl-1"> - </span><span class="hl-14">763.5px</span><span class="hl-1">);</span><br/><span class="hl-1"> </span><span class="hl-11">max-width</span><span class="hl-1">: </span><span class="hl-0">calc</span><span class="hl-1">(</span><span class="hl-14">3.5rem</span><span class="hl-1"> + </span><span class="hl-0">var</span><span class="hl-1">(</span><span class="hl-11">--bs-border-width</span><span class="hl-1">) * </span><span class="hl-14">2</span><span class="hl-1">)</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h3 id="css-variable-inlining" class="tsd-anchor-link">CSS variable inlining<a href="#css-variable-inlining" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">:root {</span><br/><br/><span class="hl-2">--preferred-width: 20px;</span><br/><span class="hl-2">}</span><br/><span class="hl-2">.foo-bar {</span><br/><br/><span class="hl-2"> width: calc(calc(var(--preferred-width) + 1px) / 3 + 5px);</span><br/><span class="hl-2"> height: calc(100% / 4);}</span><br/><span class="hl-2">`</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">prettyPrint</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, {</span><span class="hl-4">inlineCssVariables:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">}).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}).</span><span class="hl-4">code</span><span class="hl-1">);</span><br/>
</code><button type="button">Copy</button></pre>
<p>result</p>
<pre><code class="css"><span class="hl-15">.foo-bar</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">width</span><span class="hl-1">: </span><span class="hl-14">12px</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-11">height</span><span class="hl-1">: </span><span class="hl-14">25%</span><br/><span class="hl-1">}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="css-variable-inlining-and-relative-color" class="tsd-anchor-link">CSS variable inlining and relative color<a href="#css-variable-inlining-and-relative-color" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">:root {</span><br/><span class="hl-2">--color: green;</span><br/><span class="hl-2">}</span><br/><span class="hl-2">._19_u :focus {</span><br/><span class="hl-2"> color: hsl(from var(--color) calc(h * 2) s l);</span><br/><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">prettyPrint</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, {</span><span class="hl-4">inlineCssVariables:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">}).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}).</span><span class="hl-4">code</span><span class="hl-1">);</span><br/>
</code><button type="button">Copy</button></pre>
<p>result</p>
<pre><code class="css"><span class="hl-15">._19_u</span><span class="hl-1"> </span><span class="hl-15">:focus</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">color</span><span class="hl-1">: </span><span class="hl-16">navy</span><br/><span class="hl-1">}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="css-variable-inlining-and-relative-color-1" class="tsd-anchor-link">CSS variable inlining and relative color<a href="#css-variable-inlining-and-relative-color-1" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><pre><code class="javascript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parse</span><span class="hl-1">, </span><span class="hl-4">render</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">html { --bluegreen: oklab(54.3% -22.5% -5%); }</span><br/><span class="hl-2">.overlay {</span><br/><span class="hl-2"> background: oklab(from var(--bluegreen) calc(1.0 - l) calc(a * 0.8) b);</span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">prettyPrint</span><span class="hl-1"> = </span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parse</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, {</span><span class="hl-4">inlineCssVariables:</span><span class="hl-1"> </span><span class="hl-6">true</span><span class="hl-1">}).</span><span class="hl-0">then</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> </span><span class="hl-0">render</span><span class="hl-1">(</span><span class="hl-4">result</span><span class="hl-1">.</span><span class="hl-4">ast</span><span class="hl-1">, {</span><span class="hl-4">minify:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">}).</span><span class="hl-4">code</span><span class="hl-1">);</span><br/>
</code><button type="button">Copy</button></pre>
<p>result</p>
<pre><code class="css"><span class="hl-15">.overlay</span><span class="hl-1"> {</span><br/><span class="hl-1"> </span><span class="hl-11">background</span><span class="hl-1">: </span><span class="hl-16">#0c6464</span><br/><span class="hl-1">}</span><br/>
</code><button type="button">Copy</button></pre>
<h1 id="node-walker" class="tsd-anchor-link">Node Walker<a href="#node-walker" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h1><pre><code class="javascript"><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">walk</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">'@tbela99/css-parser'</span><span class="hl-1">;</span><br/><br/><span class="hl-3">for</span><span class="hl-1"> (</span><span class="hl-6">const</span><span class="hl-1"> {</span><span class="hl-7">node</span><span class="hl-1">, </span><span class="hl-7">parent</span><span class="hl-1">, </span><span class="hl-7">root</span><span class="hl-1">} </span><span class="hl-6">of</span><span class="hl-1"> </span><span class="hl-0">walk</span><span class="hl-1">(</span><span class="hl-4">ast</span><span class="hl-1">)) {</span><br/><br/><span class="hl-1"> </span><span class="hl-5">// do something</span><br/><span class="hl-1">}</span>
</code><button type="button">Copy</button></pre>
<h2 id="ast" class="tsd-anchor-link">AST<a href="#ast" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><h3 id="comment" class="tsd-anchor-link">Comment<a href="#comment" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
<li>typ: number</li>
<li>val: string, the comment</li>
</ul>
<h3 id="declaration" class="tsd-anchor-link">Declaration<a href="#declaration" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
<li>typ: number</li>
<li>nam: string, declaration name</li>
<li>val: array of tokens</li>
</ul>
<h3 id="rule" class="tsd-anchor-link">Rule<a href="#rule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
<li>typ: number</li>
<li>sel: string, css selector</li>
<li>chi: array of children</li>
</ul>
<h3 id="atrule" class="tsd-anchor-link">AtRule<a href="#atrule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
<li>typ: number</li>
<li>nam: string. AtRule name</li>
<li>val: rule prelude</li>
</ul>
<h3 id="atrulestylesheet" class="tsd-anchor-link">AtRuleStyleSheet<a href="#atrulestylesheet" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
<li>typ: number</li>
<li>chi: array of children</li>
</ul>
<h3 id="keyframerule" class="tsd-anchor-link">KeyFrameRule<a href="#keyframerule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><ul>
<li>typ: number</li>
<li>sel: string, css selector</li>
<li>chi: array of children</li>
</ul>
<h2 id="sourcemap" class="tsd-anchor-link">Sourcemap<a href="#sourcemap" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul>
<li>[x] sourcemap generation</li>
</ul>
<h2 id="minification" class="tsd-anchor-link">Minification<a href="#minification" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul>
<li>[x] minify keyframes</li>
<li>[x] minify transform functions</li>
<li>[x] evaluate math functions calc(), clamp(), min(), max(), round(), mod(), rem(), sin(), cos(), tan(), asin(),
acos(), atan(), atan2(), pow(), sqrt(), hypot(), log(), exp(), abs(), sign()</li>
<li>[x] minify colors</li>
<li>[x] minify numbers and Dimensions tokens</li>
<li>[x] multi-pass minification</li>
<li>[x] inline css variables</li>
<li>[x] merge identical rules</li>
<li>[x] merge adjacent rules</li>
<li>[x] compute shorthand: see the list below</li>
<li>[x] remove redundant declarations</li>
<li>[x] conditionally unwrap :is()</li>
<li>[x] automatic css nesting</li>
<li>[x] automatically wrap selectors using :is()</li>
<li>[x] avoid reparsing (declarations, selectors, at-rule)</li>
<li>[x] node and browser versions</li>
<li>[x] decode and replace utf-8 escape sequence</li>
<li>[x] experimental CSS prefix removal</li>
</ul>
<h2 id="computed-shorthands-properties" class="tsd-anchor-link">Computed shorthands properties<a href="#computed-shorthands-properties" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul>
<li>[ ] ~all~</li>
<li>[x] animation</li>
<li>[x] background</li>
<li>[x] border</li>
<li>[ ] border-block-end</li>
<li>[ ] border-block-start</li>
<li>[x] border-bottom</li>
<li>[x] border-color</li>
<li>[ ] border-image</li>
<li>[ ] border-inline-end</li>
<li>[ ] border-inline-start</li>
<li>[x] border-left</li>
<li>[x] border-radius</li>
<li>[x] border-right</li>
<li>[x] border-style</li>
<li>[x] border-top</li>
<li>[x] border-width</li>
<li>[x] column-rule</li>
<li>[x] columns</li>
<li>[x] container</li>
<li>[ ] contain-intrinsic-size</li>
<li>[x] flex</li>
<li>[x] flex-flow</li>
<li>[x] font</li>
<li>[ ] font-synthesis</li>
<li>[ ] font-variant</li>
<li>[x] gap</li>
<li>[ ] grid</li>
<li>[ ] grid-area</li>
<li>[ ] grid-column</li>
<li>[ ] grid-row</li>
<li>[ ] grid-template</li>
<li>[x] inset</li>
<li>[x] list-style</li>
<li>[x] margin</li>
<li>[ ] mask</li>
<li>[ ] offset</li>
<li>[x] outline</li>
<li>[x] overflow</li>
<li>[x] padding</li>
<li>[ ] place-content</li>
<li>[ ] place-items</li>
<li>[ ] place-self</li>
<li>[ ] scroll-margin</li>
<li>[ ] scroll-padding</li>
<li>[ ] scroll-timeline</li>
<li>[x] text-decoration</li>
<li>[x] text-emphasis</li>
<li>[x] transition</li>
</ul>
<h2 id="performance" class="tsd-anchor-link">Performance<a href="#performance" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><ul>
<li>[x] flatten @import</li>
</ul>
<h2 id="node-transformation" class="tsd-anchor-link">Node Transformation<a href="#node-transformation" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h2><p>Ast can be transformed using node visitors</p>
<h3 id="exemple-1-declaration" class="tsd-anchor-link">Exemple 1: Declaration<a href="#exemple-1-declaration" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>the visitor is called for any declaration encountered</p>
<pre><code class="typescript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">AstDeclaration</span><span class="hl-1">, </span><span class="hl-4">ParserOptions</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/@types"</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1">: </span><span class="hl-13">ParserOptions</span><span class="hl-1"> = {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">visitor:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-0">Declaration</span><span class="hl-4">:</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">: </span><span class="hl-13">AstDeclaration</span><span class="hl-1">) </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-3">if</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">.</span><span class="hl-4">nam</span><span class="hl-1"> == </span><span class="hl-2">'-webkit-transform'</span><span class="hl-1">) {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">node</span><span class="hl-1">.</span><span class="hl-4">nam</span><span class="hl-1"> = </span><span class="hl-2">'transform'</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">}</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">.foo {</span><br/><span class="hl-2"> -webkit-transform: scale(calc(100 * 2/ 15));</span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">));</span><br/><br/><span class="hl-5">// .foo{transform:scale(calc(40/3))}</span>
</code><button type="button">Copy</button></pre>
<h3 id="exemple-2-declaration" class="tsd-anchor-link">Exemple 2: Declaration<a href="#exemple-2-declaration" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>the visitor is called only on 'height' declarations</p>
<pre><code class="typescript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">AstDeclaration</span><span class="hl-1">, </span><span class="hl-4">LengthToken</span><span class="hl-1">, </span><span class="hl-4">ParserOptions</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/@types"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">EnumToken</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/lib"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/node"</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1">: </span><span class="hl-13">ParserOptions</span><span class="hl-1"> = {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">visitor:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">Declaration:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-5">// called only for height declaration</span><br/><span class="hl-1"> </span><span class="hl-0">height</span><span class="hl-4">:</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">: </span><span class="hl-13">AstDeclaration</span><span class="hl-1">): </span><span class="hl-13">AstDeclaration</span><span class="hl-1">[] </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><br/><br/><span class="hl-1"> </span><span class="hl-3">return</span><span class="hl-1"> [</span><br/><span class="hl-1"> </span><span class="hl-4">node</span><span class="hl-1">,</span><br/><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">typ:</span><span class="hl-1"> </span><span class="hl-4">EnumToken</span><span class="hl-1">.</span><span class="hl-4">DeclarationNodeType</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">nam:</span><span class="hl-1"> </span><span class="hl-2">'width'</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">val:</span><span class="hl-1"> [</span><br/><span class="hl-1"> <</span><span class="hl-13">LengthToken</span><span class="hl-1">>{</span><br/><span class="hl-1"> </span><span class="hl-4">typ:</span><span class="hl-1"> </span><span class="hl-4">EnumToken</span><span class="hl-1">.</span><span class="hl-4">LengthTokenType</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">val:</span><span class="hl-1"> </span><span class="hl-14">3</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">unit:</span><span class="hl-1"> </span><span class="hl-2">'px'</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> ]</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> ];</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">};</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">.foo {</span><br/><span class="hl-2"> height: calc(100px * 2/ 15);</span><br/><span class="hl-2">}</span><br/><span class="hl-2">.selector {</span><br/><span class="hl-2">color: lch(from peru calc(l * 0.8) calc(c * 0.7) calc(h + 180)) </span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">));</span><br/><br/><span class="hl-5">// .foo{height:calc(40px/3);width:3px}.selector{color:#0880b0}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="exemple-3-at-rule" class="tsd-anchor-link">Exemple 3: At-Rule<a href="#exemple-3-at-rule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>the visitor is called on any at-rule</p>
<pre><code class="typescript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">AstAtRule</span><span class="hl-1">, </span><span class="hl-4">ParserOptions</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/@types"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/node"</span><span class="hl-1">;</span><br/><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1">: </span><span class="hl-13">ParserOptions</span><span class="hl-1"> = {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">visitor:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-0">AtRule</span><span class="hl-4">:</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">: </span><span class="hl-13">AstAtRule</span><span class="hl-1">): </span><span class="hl-13">AstAtRule</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-3">if</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">.</span><span class="hl-4">nam</span><span class="hl-1"> == </span><span class="hl-2">'media'</span><span class="hl-1">) {</span><br/><br/><span class="hl-1"> </span><span class="hl-3">return</span><span class="hl-1"> {...</span><span class="hl-4">node</span><span class="hl-1">, </span><span class="hl-4">val:</span><span class="hl-1"> </span><span class="hl-2">'all'</span><span class="hl-1">}</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">};</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">@media screen {</span><br/><span class="hl-2"> </span><br/><span class="hl-2"> .foo {</span><br/><br/><span class="hl-2"> height: calc(100px * 2/ 15); </span><br/><span class="hl-2"> } </span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">));</span><br/><br/><span class="hl-5">// .foo{height:calc(40px/3)}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="exemple-4-at-rule" class="tsd-anchor-link">Exemple 4: At-Rule<a href="#exemple-4-at-rule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>the visitor is called only for at-rule media</p>
<pre><code class="typescript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">AstAtRule</span><span class="hl-1">, </span><span class="hl-4">ParserOptions</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/@types"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/node"</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1">: </span><span class="hl-13">ParserOptions</span><span class="hl-1"> = {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">visitor:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">AtRule:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-0">media</span><span class="hl-4">:</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">: </span><span class="hl-13">AstAtRule</span><span class="hl-1">): </span><span class="hl-13">AstAtRule</span><span class="hl-1"> </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">node</span><span class="hl-1">.</span><span class="hl-4">val</span><span class="hl-1"> = </span><span class="hl-2">'all'</span><span class="hl-1">;</span><br/><span class="hl-1"> </span><span class="hl-3">return</span><span class="hl-1"> </span><span class="hl-4">node</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">};</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">@media screen {</span><br/><span class="hl-2"> </span><br/><span class="hl-2"> .foo {</span><br/><br/><span class="hl-2"> height: calc(100px * 2/ 15); </span><br/><span class="hl-2"> } </span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">));</span><br/><br/><span class="hl-5">// .foo{height:calc(40px/3)}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="exemple-5-rule" class="tsd-anchor-link">Exemple 5: Rule<a href="#exemple-5-rule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>the visitor is called on any Rule</p>
<pre><code class="typescript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">AstAtRule</span><span class="hl-1">, </span><span class="hl-4">ParserOptions</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/@types"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/node"</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1">: </span><span class="hl-13">ParserOptions</span><span class="hl-1"> = {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">visitor:</span><span class="hl-1"> {</span><br/><br/><br/><span class="hl-1"> </span><span class="hl-0">Rule</span><span class="hl-1">(</span><span class="hl-4">node</span><span class="hl-1">: </span><span class="hl-13">AstRule</span><span class="hl-1">): </span><span class="hl-13">AstRule</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-3">return</span><span class="hl-1"> {...</span><span class="hl-4">node</span><span class="hl-1">, </span><span class="hl-4">sel:</span><span class="hl-1"> </span><span class="hl-2">'.foo,.bar,.fubar'</span><span class="hl-1">};</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">};</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2"> .foo {</span><br/><br/><span class="hl-2"> height: calc(100px * 2/ 15); </span><br/><span class="hl-2"> } </span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">));</span><br/><br/><span class="hl-5">// .foo,.bar,.fubar{height:calc(40px/3)}</span><br/>
</code><button type="button">Copy</button></pre>
<h3 id="exemple-6-rule" class="tsd-anchor-link">Exemple 6: Rule<a href="#exemple-6-rule" aria-label="Permalink" class="tsd-anchor-icon"><svg viewBox="0 0 24 24" aria-hidden="true"><use href="../assets/icons.svg#icon-anchor"></use></svg></a></h3><p>Adding declarations to any rule</p>
<pre><code class="typescript"><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">transform</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/node"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">AstRule</span><span class="hl-1">, </span><span class="hl-4">ParserOptions</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/@types"</span><span class="hl-1">;</span><br/><span class="hl-3">import</span><span class="hl-1"> {</span><span class="hl-4">parseDeclarations</span><span class="hl-1">} </span><span class="hl-3">from</span><span class="hl-1"> </span><span class="hl-2">"../src/lib"</span><span class="hl-1">;</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">options</span><span class="hl-1">: </span><span class="hl-13">ParserOptions</span><span class="hl-1"> = {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">removeEmpty:</span><span class="hl-1"> </span><span class="hl-6">false</span><span class="hl-1">,</span><br/><span class="hl-1"> </span><span class="hl-4">visitor:</span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-0">Rule</span><span class="hl-4">:</span><span class="hl-1"> </span><span class="hl-6">async</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">: </span><span class="hl-13">AstRule</span><span class="hl-1">): </span><span class="hl-13">Promise</span><span class="hl-1"><</span><span class="hl-13">AstRule</span><span class="hl-1"> | </span><span class="hl-13">null</span><span class="hl-1">> </span><span class="hl-6">=></span><span class="hl-1"> {</span><br/><br/><span class="hl-1"> </span><span class="hl-3">if</span><span class="hl-1"> (</span><span class="hl-4">node</span><span class="hl-1">.</span><span class="hl-4">sel</span><span class="hl-1"> == </span><span class="hl-2">'.foo'</span><span class="hl-1">) {</span><br/><br/><span class="hl-1"> </span><span class="hl-4">node</span><span class="hl-1">.</span><span class="hl-4">chi</span><span class="hl-1">.</span><span class="hl-0">push</span><span class="hl-1">(...</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">parseDeclarations</span><span class="hl-1">(</span><span class="hl-2">'width: 3px'</span><span class="hl-1">));</span><br/><span class="hl-1"> </span><span class="hl-3">return</span><span class="hl-1"> </span><span class="hl-4">node</span><span class="hl-1">;</span><br/><span class="hl-1"> }</span><br/><br/><span class="hl-1"> </span><span class="hl-3">return</span><span class="hl-1"> </span><span class="hl-6">null</span><span class="hl-1">;</span><br/><span class="hl-1"> }</span><br/><span class="hl-1"> }</span><br/><span class="hl-1">};</span><br/><br/><span class="hl-6">const</span><span class="hl-1"> </span><span class="hl-7">css</span><span class="hl-1"> = </span><span class="hl-2">`</span><br/><br/><span class="hl-2">.foo {</span><br/><span class="hl-2">}</span><br/><span class="hl-2">`</span><span class="hl-1">;</span><br/><br/><span class="hl-4">console</span><span class="hl-1">.</span><span class="hl-0">debug</span><span class="hl-1">(</span><span class="hl-3">await</span><span class="hl-1"> </span><span class="hl-0">transform</span><span class="hl-1">(</span><span class="hl-4">css</span><span class="hl-1">, </span><span class="hl-4">options</span><span class="hl-1">));</span><br/><br/><span class="hl-5">// .foo{width:3px}</span><br/>
</code><button type="button">Copy</button></pre>
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