inlineCssPrerenderplugin

inlineCss.js

var uncss = require('uncss');
var CleanCSS = require('clean-css');


module.exports = {
    beforeSend: function(req, res, next) {
        if(!req.prerender.documentHTML) {
            return next();
        }
        var matches = req.prerender.documentHTML.toString().match(/<link(?:.*?)rel="stylesheet"(?:.*?)>/gi);
        var styleSheets = [];
        for (var i = 0; matches && i < matches.length; i++) {
            var style= matches[i].replace(/<link(?:.*?)href=/gi,'').replace('>','');
            if(matches.indexOf("media")===-1) {
                style = style.replace(/"/g, '');
                style = style.replace('//', 'http://');
                styleSheets.push(style);
            }
        }
        uncss(req.prerender.documentHTML.toString(),{stylesheets:styleSheets},function(err,output){
            var minified = '<style>'+new CleanCSS().minify(output).styles+'</style>';
            req.prerender.documentHTML=req.prerender.documentHTML.toString().replace('</title>','</title>'+minified);
            next();
        });

    }
};

package.json

{
  "author": "Prerender.io",
  "name": "prerender",
  "description": "Service to prerender Javascript rendered pages for SEO",
  "version": "4.0.4",
  "license": "MIT",
  "repository": {
    "type": "git",
    "url": "https://github.com/prerender/prerender"
  },
  "dependencies": {
    "aws-sdk": "^2.1.8",
    "cache-manager": "^0.16.0",
    "clean-css": "^3.4.10",
    "he": "^0.5.0",
    "lodash": "^3.1.0",
    "phridge": "^2.0.0",
    "prerender-redis-cache": "^0.1.6",
    "redis": "^2.4.2",
    "uncss": "^0.13.0",
    "xml2js": "^0.4.16"
  },
  "devDependencies": {
    "mocha": "~1.13.0",
    "sinon": "~1.7.3"
  },
  "scripts": {
    "test": "./node_modules/.bin/mocha"
  },
  "bin": {
    "prerender": "server.js"
  },
  "engines": {
    "node": ">=0.12.9"
  }
}

server.js

server.use(prerender.httpHeaders());
server.use(prerender.inlineCss());
server.use(require('prerender-redis-cache'));
// server.use(prerender.s3HtmlCache());