Compression using babel-brunch and uglify-js-brunch is not working as i expect .. please tell me what am i doing wrong

[roro1993]

Description

I am very new to npm and brunch so please bare with me..
What i need is simply to compress my js file.. that is having (=>) and (let) that are consider es5 or es6 im not sure .. and this is because i am working with the phoenix.js library for websockets that uses this syntax..
how ever for production i would need to compress these file

Expected behavior

This is what is expected to happen

Example1:

https://babeljs.io/repl/#?babili=true&browsers=&build=&builtIns=false&code_lz=G4QwTgBAJgpsMBsD2AHAtjAdgFwLJNgGVtUB1EAS2wswHMAFMJAYxgGc2IBeCABgG4AUAhjYIzABYhMmRNwhsWAa1EA6SdNkIAFACIAHroCUQjTMSqkmPbIDuAfTRtaugDQQntbgD4IVgHIwtrjO2p5GJoJmWpbWuswArmwkGGBuHs4-ELSiAMJJKTBgADI0SmHOEfxAA&debug=false&circleciRepo=&evaluate=false&lineWrap=true&presets=es2015%2Creact%2Cstage-3%2Cbabili&prettier=false&targets=&version=6.26.0

Example 2:

change this code:

var developmentModeStopWaitingProcess = 0;
let channel = socket.channel("x");
channel.on("new_msg", msg => onNewMsg(msg));
channel.on("customer", msg => getCustomerLink(msg));

to this:
"use strict";var developmentModeStopWaitingProcess=0,channel=socket.channel("x");channel.on("new_msg",function(a){return onNewMsg(a)}),channel.on("customer",function(a){return getCustomerLink(a)});

Actual behavior

what happens is that after brunch build -d
the generated file has extra code and functions that i dont need
and wraps my code into a

require.register("js/test.js", function(exports, require, module) {
// my code that doesnt work when its here
});

And uglifies it afterwards ..

i dont need all of that extra code i just want to minify it and thts all
I simply need it to work as what this website does:

https://babeljs.io/repl/#?babili=true&browsers=&build=&builtIns=false&code_lz=ARA&debug=false&circleciRepo=&evaluate=false&lineWrap=true&presets=es2015%2Creact%2Cstage-3%2Cbabili&prettier=false&targets=&version=6.26.0

how can i achieve this..

Environment

1. Brunch: 2.10.12
2. Node.js: 6.12.0
3. NPM: 3.10.10
4. Operating system: linux
5. Code editor: sublime

package.json contents

{
  "name": "nameProject",
  "version": "version",
  "description": "Compress Files",
  "main": "index.js",
  "scripts": {
    "start": "babel src -d dist"
  },
  "author": "y",
  "babel": {
    "presets": [
      "es2015"
    ]
  },
  "devDependencies": {
    "babel-brunch": "^6.1.1",
    "clean-css-brunch": "^2.10.0",
    "coffeelint-brunch": "^2.10.0",
    "css-brunch": "^2.10.0",
    "html-pages-brunch": "^2.6.0",
    "stylus-brunch": "^2.10.0",
    "uglify-js-brunch": "^2.10.0",
    "javascript-brunch": "~2.0.0"
  },
  "dependencies": {
    "babel": "^6.23.0",
    "babel-cli": "^6.26.0",
    "babel-core": "^6.26.0",
    "babel-preset-env": "^1.6.1",
    "babel-preset-es2015": "^6.24.1",
    "babel-register": "^6.24.1",
    "babel-standalone": "^6.26.0",
    "uglify-js": "^3.2.2"
  }
}

brunch config contents

module.exports = {
    files: {
        javascripts: {
            joinTo: {
                'js/test.js': /js\/test.js/,
            },
        },
        stylesheets: {
            joinTo: {
                'css/x.css' : /css\/x.css/
            },
        },
    },
    plugins: {
        cleancss: {
          keepSpecialComments: 0,
          removeEmpty: true
        },
        uglify: {
            mangle: false,
            compress: {
                global_defs: {
                    DEBUG: true
                }
            }
        },
        babel: {
            pattern: /\.(js)$/,
            presets: ['es2015', 'env']
        }
    },
    paths: {
        // Dependencies and current project directories to watch
        watched: ["css", "js"]
    },
    npm: {
        enabled: true,
        compilers : ['babel-brunch']
    }
}

Logs

each time i build ( brunch build -d ) i get the following:

brunch:file Init file js/test.js +1ms
brunch:pipeline Compiling js/test.js @ babel-brunch +0ms
brunch:file Generated source map for 'js/test.js' +68ms
brunch:list Compiled js/test.js +1ms

and each time i run ( npm start ) i get the following errors:

npm ERR! Linux 4.4.0-101-generic
npm ERR! argv "/usr/bin/node" "/usr/bin/npm" "start"
npm ERR! node v6.12.0
npm ERR! npm v3.10.10
npm ERR! code ELIFECYCLE
npm ERR! nameProject@version start: babel src -d dist
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the nameProject@version start script 'babel src -d dist'.
npm ERR! Make sure you have the latest version of node.js and npm installed.
npm ERR! If you do, this is most likely a problem with the nameProject package,
npm ERR! not with npm itself.
npm ERR! Tell the author that this fails on your system:
npm ERR! babel src -d dist
npm ERR! You can get information on how to open an issue for this project with:
npm ERR! npm bugs nameProject
npm ERR! Or if that isn't available, you can get their info via:
npm ERR! npm owner ls nameProject
npm ERR! There is likely additional logging output above.

npm ERR! Please include the following file with any support request:
npm ERR! {path}/nameProject/npm-debug.log