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CSS Post-Processor that chunks CSS files per IE9 selector count restrictions

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<!doctype html> <html lang="en"> <head> <title>Code coverage report for src/commands/chunk.js</title> <meta charset="utf-8" /> <link rel="stylesheet" href="../../prettify.css" /> <link rel="stylesheet" href="../../base.css" /> <meta name="viewport" content="width=device-width, initial-scale=1"> <style type='text/css'> .coverage-summary .sorter { background-image: url(../../sort-arrow-sprite.png); } </style> </head> <body> <div class='wrapper'> <div class='pad1'> <h1> <a href="../../index.html">all files</a> / <a href="index.html">src/commands/</a> chunk.js </h1> <div class='clearfix'> <div class='fl pad1y space-right2'> <span class="strong">0% </span> <span class="quiet">Statements</span> <span class='fraction'>0/58</span> </div> <div class='fl pad1y space-right2'> <span class="strong">0% </span> <span class="quiet">Branches</span> <span class='fraction'>0/10</span> </div> <div class='fl pad1y space-right2'> <span class="strong">0% </span> <span class="quiet">Functions</span> <span 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cline-no">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span> <span class="cline-any cline-neutral">&nbsp;</span></td><td class="text"><pre class="prettyprint lang-js"><span class="cstat-no" title="statement not covered" >import chalk from 'chalk';</span> <span class="cstat-no" title="statement not covered" >import yargs from 'yargs';</span> <span class="cstat-no" title="statement not covered" >import common from './common-yargs';</span> <span class="cstat-no" title="statement not covered" >import { chunkFile } from '../index';</span> <span class="cstat-no" title="statement not covered" >import path from 'path';</span> <span class="cstat-no" title="statement not covered" >import fs from 'fs';</span> <span class="cstat-no" title="statement not covered" >import fsp from 'fs-promise';</span> <span class="cstat-no" title="statement not covered" >import { ensureDir, expand } from '../fs-utils';</span> &nbsp; <span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >async function <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >executeChunk(input, outputDir, chunkOptions) {</span></span></span></span></span></span></span></span></span></span></span> let <span class="cstat-no" title="statement not covered" >basename = path.basename(input, '.css');</span> &nbsp; const {data, maps, totalSelectorCount} = await <span class="cstat-no" title="statement not covered" >chunkFile(input, chunkOptions);</span> &nbsp; let chunkData = data.map(<span class="fstat-no" title="function not covered" >(ast, index) =&gt; {</span> let <span class="cstat-no" title="statement not covered" >outputFilename = path.join(outputDir, `${basename}.${index}.css`);</span> &nbsp; return <span class="cstat-no" title="statement not covered" >fsp.writeFile(outputFilename, ast);</span> }); &nbsp; let sourcemaps = maps.map(<span class="fstat-no" title="function not covered" >(sourcemap, index) =&gt; {</span> let <span class="cstat-no" title="statement not covered" >outputFilename = path.join(outputDir, `${basename}.${index}.css.map`);</span> &nbsp; return <span class="cstat-no" title="statement not covered" >fsp.writeFile(outputFilename, JSON.stringify(sourcemap));</span> }); &nbsp; const chunks = await <span class="cstat-no" title="statement not covered" >Promise.all(chunkData);</span> await <span class="cstat-no" title="statement not covered" >Promise.all(sourcemaps);</span> &nbsp; return <span class="cstat-no" title="statement not covered" >chunks;</span> } &nbsp; <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function execute(options) {</span></span> return <span class="cstat-no" title="statement not covered" >expand(options.input)</span> .filter(<span class="fstat-no" title="function not covered" >x =&gt; <span class="cstat-no" title="statement not covered" >/\.css$/.test(x))</span></span> .map(<span class="fstat-no" title="function not covered" >filepath =&gt; {</span> let <span class="cstat-no" title="statement not covered" >outputDir = options.outDir;</span> &nbsp; return <span class="cstat-no" title="statement not covered" >ensureDir(outputDir)</span> .then(<span class="fstat-no" title="function not covered" >() =&gt; <span class="cstat-no" title="statement not covered" >executeChunk(filepath, outputDir, { sourcemaps: options.sourcemaps }));</span></span> }) .flatMap(<span class="fstat-no" title="function not covered" >x =&gt; <span class="cstat-no" title="statement not covered" >x)</span></span> .reduce(<span class="fstat-no" title="function not covered" >(acc, x) =&gt; <span class="cstat-no" title="statement not covered" >acc.concat([x]), [])</span></span> .toPromise(Promise) .then(<span class="fstat-no" title="function not covered" >() =&gt; {</span> console.<span class="cstat-no" title="statement not covered" >log(chalk.green('Complete'));</span> return <span class="cstat-no" title="statement not covered" >0;</span> }); } &nbsp; <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function yargsSetup() {</span></span> yargs.<span class="cstat-no" title="statement not covered" >command('chunk', 'breaks up css file to multiple files if it exceeds IE selector limits');</span> } &nbsp; <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function examples() {</span></span> yargs.<span class="cstat-no" title="statement not covered" >example('$0 chunk &lt;input file|directory&gt; (chunked files will reside next to input css files with the format *.##.css)');</span> yargs.<span class="cstat-no" title="statement not covered" >example('$0 chunk &lt;input file|directory&gt; --out-dir &lt;output directory&gt;');</span> yargs.<span class="cstat-no" title="statement not covered" >example('$0 chunk &lt;input file|directory&gt; --sourcemaps');</span> } &nbsp; <span class="cstat-no" title="statement not covered" ><span class="fstat-no" title="function not covered" >function parseArgs(argv){</span></span> yargs.<span class="cstat-no" title="statement not covered" >reset();</span> &nbsp; common(); examples(); &nbsp; let <span class="cstat-no" title="statement not covered" >options = yargs</span> .help('h') .alias('h', 'help') .options({ 'out-dir': { description: 'output directory', type: 'string' }, 'sourcemaps': { description: 'ouput sourcemaps', type: 'boolean' } }) .parse(argv); &nbsp; if (<span class="cstat-no" title="statement not covered" >options.help) {</span> return <span class="cstat-no" title="statement not covered" >options;</span> } &nbsp; options.<span class="cstat-no" title="statement not covered" >input = options._.length &gt; 0 ? options._[0] : null;</span> &nbsp; if (<span class="cstat-no" title="statement not covered" >!options.input) {</span> throw <span class="cstat-no" title="statement not covered" >'No input provided';</span> } &nbsp; options.<span class="cstat-no" title="statement not covered" >input = path.resolve(options.input);</span> &nbsp; if (<span class="cstat-no" title="statement not covered" >!options.outDir) {</span> if (<span class="cstat-no" title="statement not covered" >fs.statSync(options.input).isDirectory()) {</span> options.<span class="cstat-no" title="statement not covered" >outDir = options.input;</span> } else { options.<span class="cstat-no" title="statement not covered" >outDir = path.dirname(options.input);</span> } } else { options.<span class="cstat-no" title="statement not covered" >outDir = path.resolve(options.outDir);</span> } &nbsp; return <span class="cstat-no" title="statement not covered" >options;</span> } &nbsp; export default <span class="cstat-no" title="statement not covered" >{</span> execute, examples, yargsSetup, parseArgs }; &nbsp;</pre></td></tr> </table></pre> <div class='push'></div><!-- for sticky footer --> </div><!-- /wrapper --> <div class='footer quiet pad2 space-top1 center small'> Code coverage generated by <a href="http://istanbul-js.org/" target="_blank">istanbul</a> at Tue Jun 28 2016 20:59:20 GMT-0600 (MDT) </div> </div> <script src="../../prettify.js"></script> <script> window.onload = function () { if (typeof prettyPrint === 'function') { prettyPrint(); } }; </script> <script src="../../sorter.js"></script> </body> </html>