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var escodegen = require('escodegen');
var js = escodegen.generate({
	"type": "VariableDeclaration",
	"start": 0,
	"end": 6,
	"range": [
		0,
		6
	],
	"declarations": [

juanpicado

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';

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var escope = require('escope');
var esprima = require('esprima');
var estraverse = require('estraverse');
var code = require('./ast');
var ast = code.esprimaAST();
var scopeManager = escope.analyze(ast);
var scopes = scopeManager.scopes;
// return an array of scopes, in our example we have 2, the global and inside of the function
var currentScope = scopeManager.acquire(ast); 
// return the global scope, the current one

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var esrefactor = require('esrefactor');
var code = require('./ast');
// function bar(){ var a; console.log("foo", a);}
var ctx = new esrefactor.Context(code.codeVariable);

var id = ctx.identify(21);
console.log("id", id);
//id { identifier: { type: 'Identifier', name: 'a', range: [ 20, 21 ] },
//  declaration: { type: 'Identifier', name: 'a', range: [ 20, 21 ] },

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var esprima = require('esprima');
var esmangle = require('esmangle');
var escodegen = require('escodegen');
var codeBase = require('./code');
var ast = esprima.parse(codeBase.wholeFile());
var result = esmangle.mangle(ast);  // gets mangled result
console.log(escodegen.generate(result, {
	format: {
		renumber: true,

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var assert = require("assert");
var n = require("ast-types").namedTypes;
var b = require("ast-types").builders;

var fooId = b.identifier("foo");
var ifFoo = b.ifStatement(fooId, b.blockStatement([
    b.expressionStatement(b.callExpression(fooId, []))
]));

assert.ok(n.IfStatement.check(ifFoo));

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-server
-Xms512m
-Xmx2048m
-XX:MaxPermSize=512m
-XX:ReservedCodeCacheSize=256m
-XX:+UseCodeCacheFlushing
-XX:+UseCompressedOops
-XX:+UseConcMarkSweepGC
-XX:+AggressiveOpts
-XX:+CMSClassUnloadingEnabled

juanpicado

Step 0:

Get Homebrew installed on your mac if you don't already have it

Step 1:

Install highlight. "brew install highlight". (This brings down Lua and Boost as well)

Step 2:

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function Foo(x, y) {
  this.x = x;
  this.y = y;
}

var A = new Foo(1,3);
var B = new Foo(2,4);
// we modify the object
B.z = 4;

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const myPromise = (a) => {
  return Promise.resolve(a);
}

async function foo() {
   let d1 = await myPromise(1).then(console.log);
   let d2 = await myPromise(2).then(console.log);;   
}