Javascript simplest parsing with Esprima

esprima-simplest-sample.js

var util = require('util');
var esprima = require('esprima');
var fs = require('fs');

var jscode = fs.readFileSync('./src/index.js').toString('utf8');
jscode = jscode.replace(/#!.*\n/,'');  //remove shebang (executable js files)
console.log(jscode);
var tree = esprima.parse(jscode); 
console.log(util.inspect(tree, {depth: 15, colors: true}));