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# Minification and Deployment
## Understanding and Using Minification
Enyo comes with a minification tool based on UglifyJS, run by Node.js.
This tool can be used to compress the framework, other libraries, and applications, and will keep load order intact as well as correct url paths in css.
### Why compress?
Compressing enyo apps greatly reduces load times of applications, as well as reducing overall code size.
This way, you can be very verbose in the documentation of your source code, without that impacting the performance of your application in production.
### What is compressed
For enyo, the libraries, and your code: **external assets such as images will not be copied or moved**.
Instead, the CSS url paths are fixed up to reference the new path from the build location.
### How to compress
To compress your application, you must run the Node.js script named `deploy.js` that comes with Enyo, as `enyo/tools/deploy.js`.
$ node enyo/tools/deploy.js -h
This script will run the minification tool located in `enyo/tools/minifier/minify.js`, and make a build of enyo, then a build of your app.
Any libraries referenced in your `package.js` manifest will be built into your app's built code.
**NOTE:** `deploy.js` expects to find a `package.js` in the root-folder of your application. It only references your app's `package.js` to keep paths correct. Do not modify this.
### What comes out?
After running the `deploy.js` script, a new folder `build` (you change this using the `-b` flag of the `deploy.js` script) will be located next to your `source` directory.
In it will be 4 files:
- enyo.css
- enyo.js
- app.css
- app.js
These files will be loaded in the given order by `index.html`.
The output of the `deploy` scripts will minify your appliaction, and copy the necessary files into `deploy/<appname>/`.
If the libraries have a compatible `deploy.sh` or `deploy.bat` script, they will be executed, and a minimal copy will be placed in the deployment's lib folder.
If no `deploy.(sh|bat)` script is found for the library, all of the library is copied into the lib folder to provide maximum safety.
If you are adding a library, please add a `deploy.sh` file and `deploy.bat` file similar to the ones in `lib/onyx`.
If no images or files are needed from the library, just include blank (and executable) copies of the deploy scripts.
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