The CLI command we'll use for starters is the following: uglifyjs jquery-3.2.1.js -output jquery-3.2.1.min.js
For this example, we'll use a copy of Jquery-3.2.1.js. With UglifyJS installed and a JavaScript file ready, let's see how much we save in terms of file size. To help demonstrate the effectiveness of using a minifier on a JavaScript file, we'll go over a couple of examples using the CLI.
Therefore, files are smaller due to fewer characters being used. into one letter and remove the unused functions and variables. This will change the name of a variable, property, etc. Things like dead_code to remove unreachable code, sequences to join consecutive simple statements using the comma operator, or join_vars to join consecutive var statements.įurthermore, another useful feature to enable is Mangle. To further minify your JS files, it's recommended to implement at least some of the options mentioned in the links above. Using -compress alone will result in a certain level of size savings, however, using only this option will not the provide the savings you could be achieving. If you'll be using the API and need a quick reference to each features list of options, check the following links: The API reference on GitHub outlines a list of options available and also include structure examples. There are myriad of usage options available in UglifyJS.
#MINIFY MEANING INSTALL#
To use UglifyJS for programmatic use: npm install uglify-js To use UglifyJS as a command line app: npm install uglify-js -g There are two slightly different commands which can be used to install UglifyJS depending on your use case. Therefore, you'll need to make sure you have the latest version of Node.js installed. You'll find two repos for UglifyJS on GitHub however, you should reference the most recent one located here. Installing UglifyJSĪs of writing this article, UglifyJS is now in its third version. There are a few different aspects of a website which can be minified including HTML, CSS, and JS, although UglifyJS focusses solely on minifying JavaScript.Īpart from minification, UglifyJS also contains a few other tools that help automate working with JS including:įor the scope of this article, we'll cover how UglifyJS's minification/compression features works and what options available to users. Minification is a valuable performance enhancing technique as it removes whitespace and unnecessary characters within a file to make it smaller and thus, load faster. This topic was modified 1 year, 7 months ago by craigmilam.UglifyJS is best known as a JavaScript minifier.
#MINIFY MEANING MANUAL#
I need help fixing the double loading instance of the css files and fixing the manual minification issues I am experiencing. They are loaded via a style tag in the head and via a link tag before However my theme css files are still being double loaded. Unchecked “enable” box on CSS minification. I turned on auto minification, purged all caches and the files were being minified again.ĥ. I turned on debug > minify and purged all caches and refreshed the page and there was nothing added to the page.Ĥ. I turned those options off in cloudflare purged all caches again and there was still no minification.ģ. I use cloudflare and even though I had HTML, css, js minification enabled there, nothing was being minified. I checked again to make sure the files were added to the js and css minification sections, once again, and made sure the enable boxes were checked and purged all caches again. Minification did not work at all when I tried this step instead my theme was loading it’s own files (Avada). I successfully selected all the files I wanted to add and saved the settings/purged the cache.
I tried turning minification to “manual” and adding the js and css files manually. Steps I’ve taken to try to resolve the problem:ġ. One was the w3tc minify file and the other was the theme minify file (both files contain the same code). I ran a test through pingdom and noticed that two large css files were being loaded.
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