gulp file with browserify uglify watchify source maps and livereload

gulpfile.babel.js

import gulp from 'gulp'
import sourcemaps from 'gulp-sourcemaps'
import buffer from 'gulp-buffer'
import uglify from 'gulp-uglify'
import babel from 'babelify'
import watchify from 'gulp-watchify'
import livereload from 'gulp-livereload'

let watching = false

let bundlePaths = {
    src: [
      'src/**/*.js',
      '!src/**/*.test.js'
    ],
    dest:'dist/'
}

gulp.task('enable-watch-mode', () => { watching = true })
gulp.task('enable-livereload', () => livereload.listen())

gulp.task('build', watchify(function(watchify) {
    return gulp.src(bundlePaths.src)
        .pipe(watchify({
            watch:watching,
            debug:true,
            setup: (bundle) => {
                bundle.transform(babel, {
                    presets: [ 'env' ]
                })
            }
        }))
        .pipe(buffer())
        .pipe(sourcemaps.init({ loadMaps: true }))
        .pipe(uglify())
        .pipe(sourcemaps.write('./'))
        .pipe(gulp.dest(bundlePaths.dest))
        .pipe(livereload())
}))

gulp.task('watch', ['enable-watch-mode', 'enable-livereload', 'build'])

gulp.task('default', ['build'])