npm install gulp-jsmin
minify js using gulp.
Install with npm
```
npm install --save-dev gulp-jsmin
`js
var gulp = require('gulp');
var jsmin = require('gulp-jsmin');
var rename = require('gulp-rename');
gulp.task('default', function () {
gulp.src('src/*/.js')
.pipe(jsmin())
.pipe(rename({suffix: '.min'}))
.pipe(gulp.dest('dist'));
});
`
```
jsmin()
MIT @chilijung