Estraverse example

estraverse.js

var estraverse = require('estraverse');
var escodegen = require('escodegen');
var ast = require('./ast');
var a = ast.esprimaAST();
// 'function bar(){ var longVariable; console.log("foo", longVariable);}'
estraverse.traverse(a, {
	enter: function (node, parent) {
		if (node.type == 'Identifier' && node.name == 'longVariable') {
			console.log(node);
			node.name = 'b';
			return node;
		}
	}
});
var js = escodegen.generate(a);
console.log(js);
// output
// function bar() {
//    var b;
//    console.log('foo', b);
// }