Gulp — Browserify — Watch — Glob

gistfile1.js

var gulp = require('gulp');
var watchify = require('watchify');
var glob = require('glob');
var browserify = require('browserify');

gulp.task('js', function(){
    glob('./scripts/*.js', function(err, files) {
        files.forEach(function(entry) {
                var w = watchify(browserify({ entries: [entry] }))
                var build = function(){
                    w.bundle()
                    .pipe(source(entry))
                    .pipe(gulp.dest('./public/js/'));
                  
                }
                w.on('update',build)
                build();
        });
    });
});