Usage:
  svgo [OPTIONS] [ARGS]

Options:
  -h, --help : Help
  -v, --version : Version
  -i INPUT, --input=INPUT : Input file, "-" for STDIN
  -s STRING, --string=STRING : Input SVG data string
  -f FOLDER, --folder=FOLDER : Input folder, optimize and rewrite all *.svg files
  -o OUTPUT, --output=OUTPUT : Output file or folder (by default the same as the input), "-" for STDOUT
  -p PRECISION, --precision=PRECISION : Set number of digits in the fractional part, overrides plugins params
  --config=CONFIG : Config file to extend or replace default
  --disable=DISABLE : Disable plugin by name
  --enable=ENABLE : Enable plugin by name
  --datauri=DATAURI : Output as Data URI string (base64, URI encoded or unencoded)
  --pretty : Make SVG pretty printed
  --show-plugins : Show available plugins and exit

Arguments:
  INPUT : Alias to --input
  OUTPUT : Alias to --output

  $ svgo red.svg red.min.svg

  Done in 68 ms!
  0.708 KiB - 70.8% = 0.207 KiB

var readFile = require('fs').readFile,
    path = require('path'),
    SVGO = require('svgo'),
    filepath = PATH.resolve(__dirname, 'test.svg'),
    svgo = new SVGO(/*{ custom config object }*/);

readFile(filepath, 'utf8', function(err, data) {

    if (err) {
        throw err;
    }

    svgo.optimize(data, function(result) {
        console.log(result);
        // {
        //     // optimized SVG data string
        //     data: '<svg width="10" height="20">test</svg>'
        //     // additional info such as width/height
        //     info: {
        //         width: '10',
        //         height: '20'
        //     }
        // }
    });
});