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import {Plugin} from 'rollup'; |
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import path from 'path'; |
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const critical = require('critical'); |
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const criticalSuffix = '_critical.min.css'; |
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const defaultCriticalConfig = { |
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inline: false, |
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minify: true, |
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extract: false, |
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width: 1200, |
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height: 1200, |
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concurrency: 4, |
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penthouse: { |
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blockJSRequests: false |
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} |
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}; |
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interface CriticalPages { |
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uri: string; |
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template: string; |
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} |
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interface CriticalPluginConfig { |
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criticalUrl: string; |
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criticalBase?: string; |
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criticalPages: Partial<CriticalPages>[]; |
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criticalConfig?: Partial<CriticalConfig>; |
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} |
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function PluginCritical(pluginConfig: CriticalPluginConfig, callback?: Function): Plugin { |
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return { |
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name: 'critical', |
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async writeBundle(outputOptions, bundle) { |
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const css: Array<string> = []; |
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// Find all of the generated CSS assets |
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if (bundle) { |
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for (const chunk of Object.values(bundle)) { |
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if (chunk.type === 'asset' && chunk.fileName.endsWith('.css')) { |
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if (outputOptions.dir !== undefined) { |
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const cssFile = path.join(outputOptions.dir, chunk.fileName); |
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css.push(cssFile); |
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} |
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} |
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} |
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// If we have no CSS, skip bundle |
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if (!css.length) { |
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return; |
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} |
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} |
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// Iterate through the pages |
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for (const page of pluginConfig.criticalPages) { |
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const criticalBase = pluginConfig.criticalBase; |
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const criticalSrc = pluginConfig.criticalUrl + page.uri; |
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const criticalDest = page.template + criticalSuffix; |
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// Merge in our options |
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const options = Object.assign( |
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{ css }, |
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defaultCriticalConfig, |
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{ |
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base: criticalBase, |
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src: criticalSrc, |
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target: criticalDest, |
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}, |
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pluginConfig.criticalConfig |
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); |
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// Generate the Critical CSS |
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console.log(`Generating critical CSS from ${criticalSrc} to ${criticalDest}`); |
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await critical.generate(options, (err: string) => { |
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if (err) { |
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console.error(err); |
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} |
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if (callback) { |
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callback(err); |
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} |
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}); |
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} |
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} |
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} |
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}; |
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export default PluginCritical |
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nystudio107 /
rollup-plugin-critical
