TODO

;; TODO option to append .min.js
;; TODO option to not minify if the gzipped size is not better

The options listed at See http://lisperator.net/uglifyjs/compress are supported.
Additionally, :mangle is supported.

The defaults :

```
{
 :sequences     true,  ; join consecutive statemets with the “comma operator”
 :properties    true,  ; optimize property access: a["foo"] → a.foo
 :dead_code     true,  ; discard unreachable code
 :drop_debugger true,  ; discard “debugger” statements
 :unsafe        false, ; some unsafe optimizations
 :conditionals  true,  ; optimize if-s and conditional expressions
 :comparisons   true,  ; optimize comparisons
 :evaluate      true,  ; evaluate constant expressions
 :booleans      true,  ; optimize boolean expressions
 :loops         true,  ; optimize loops
 :unused        true,  ; drop unused variables/functions
 :hoist_funs    true,  ; hoist function declarations
 :hoist_vars    false, ; hoist variable declarations
 :if_return     true,  ; optimize if-s followed by return/continue
 :join_vars     true,  ; join var declarations
 :cascade       true,  ; try to cascade `right` into `left` in sequences
 :side_effects  true,  ; drop side-effect-free statements
 :warnings      true,  ; warn about potentially dangerous optimizations/code
 :global_defs   {},    ; global definitions
 :mangle        false
 }
```


# Aims

The final aim is to be the go-to library to shave off some size/obfuscate code in Clojure(Script) apps.
Steps (roughly in that order):

- [ ] support source maps (UglifyJS has support for it)
- [ ] make it faster for big files (use uglify-node if availble? operate on files?)
- [ ] minify HTML directories - see https://github.com/kangax/html-minifier (which minifies html/css/js)
- [ ] benchmark and document output sizes versus the google closure compiler when gzipped on a variety of projects.
- [ ] minify JS files with different compressors (yui/google-closure/rollup etc.) and see if chaining them yields better results (after gzipping).
- [ ] minify CSS files as well - http://goalsmashers.github.io/css-minification-benchmark/
- [ ] minify JARS with proguard?
- [ ] better GZIP with zopfli / 1 - wrapper, see http://www.tricoder.net/blog/?p=197 and http://stackoverflow.com/q/30828079/1327651
- [ ] investigate https://en.wikipedia.org/wiki/SDCH
- [ ] better compress with brotli
- [ ] at any given step, see if some protocol could be implemented