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express-uglify-assets

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express-uglify-assets

combines minifys js and css on the fly

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express-uglify-assets

A middeware for express that concatenates and bundles your js and css files on the fly.

  //add assets in our routes or in your views
  assets.addJs('javascripts/library.js');
  assets.addJs('javascripts/main.js');
  assets.renderJs();

  <!-- output in development -->
  <script src="/javascripts/library.js"></script>
  <script src="/javascripts/main.js"></script>

  <!-- output in production -->
  <script src="/04e9f94bbeb85c9f9ecb98d724cd2cc0.js"></script>

Install

npm install express-uglify-assets --save

Usage

Adding the middleware to your express app

expressUglifyAssets([options])

var express = require('express');
var expressUglifyAssets = require('express-uglify-assets');

app.use(expressUglifyAssets({
    /* all options are optional */
    process: true, /* combine and minify the assets. Default: true in staging and production everywhere else false */
    root: __dirname + '/public', /* path on your filesystem assets get resolved to. Default: "."  */
    rebaseTo: 'http://localhost:3000/' /*  controls the url to which all URLs are rebased (usefull if you want to serve them over your cdn url) Default: "/" */
    cleanCssOptions: { /* options that are passed to the clean-css library */
        wrapAt: 100
    },
    uglifyJsOptions: { /* options that are passed to the uglify-es library */
        output: {
            max_line_len: 100
        }
    },
    header: { /* set additional headers for the served assets  */
        {'Cache-Control': 'public, max-age=31557600'} /* cache for 1 year is the default in production and staging */
    }
}));

Adding js/css in your template and output them

The middleware adds the following functions to your template and to res.assets in your express route callback.

assets.addCss(file)

assets.renderCss([options], [namespace])

assets.addJs(file)

assets.renderJs([options], [namespace])

example with the template engline ejs

<!DOCTYPE html>
<html lang="de">

<head>
  <meta charset="utf-8">
  <title>Example assets</title>

  <% assets.addCss('stylesheets/style.css'); %>
  <%- assets.renderCss(); %>

</head>

<body>
  <h1>asset express ejs example</h1>
  <p>
    On this page the css and js is minified. Go <a href="/not-minified">here</a> to see the not minified version.
  </p>

  <% assets.addJs('javascripts/library.js'); %>
  <% assets.addJs('javascripts/main.js'); %>
  <%- assets.renderJs(); %>
</body>

</html>

Adding attributes to the output

assets.renderJs({attr: {async: true, id: 'my_awesome_script'}});

Namespaces

assets.addJs('javascripts/advert.js', 'advertise');
assets.addJs('javascripts/library.js');
assets.addJs('javascripts/main.js');

assets.renderJs();

assets.renderJs({attr: {async: true}}, 'advertise');

Performance

When {process: true} is set, each asset is generated in sync the first time assets.renderJs/assets.renderCss is called. So the first page load will be slower. The minified and combined css/js is cached in memory. Subsequent calls with the same options and files will be served from memory. This also means changing the content while the server is running will not change the content. You need to restart your app. The Files are served with the header Cache-Control: public, max-age=31557600'

When {process: false} is false, what is the default in development, the files are send with express.sendFile(), so changes will be available without restarting the app.

License

express-uglify-assets is licensed under the MIT license.

FAQs

Package last updated on 14 Oct 2017

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