// including plugins
var gulp = require('gulp');
var watch = require('gulp-watch');

gulp.task('watch', function() {
    watch(__dirname + "/css/**/*.css", function() {
        gulp.run('minify-css');
    });
    watch(__dirname + "/js/**/*.js", function() {
        gulp.run('minify-js');
    });
});		
		
		

		
gulp watch