Use late definition to resolve circular dependency.

lib/address.js

@@ -7,7 +7,6 @@ var Base58Check = require('./encoding/base58check');
 var Networks = require('./networks');
 var Hash = require('./crypto/hash');
 var JSUtil = require('./util/js');
-var Script = require('./script');
 var PublicKey = require('./publickey');
 
 /**
@@ -505,3 +504,5 @@ Address.prototype.inspect = function() {
 };
 
 module.exports = Address;
+
+var Script = require('./script');

lib/script/script.js

@@ -1,6 +1,6 @@
 'use strict';
 
-
+var Address = require('../address');
 var BufferReader = require('../encoding/bufferreader');
 var BufferWriter = require('../encoding/bufferwriter');
 var Hash = require('../crypto/hash');
@@ -8,7 +8,6 @@ var Opcode = require('../opcode');
 var PublicKey = require('../publickey');
 var Signature = require('../crypto/signature');
 var Networks = require('../networks');
-
 var $ = require('../util/preconditions');
 var _ = require('lodash');
 var errors = require('../errors');
@@ -29,8 +28,6 @@ var Script = function Script(from) {
   if (!(this instanceof Script)) {
     return new Script(from);
   }
-  var Address = require('../address');
-
   this.chunks = [];
 
   if (BufferUtil.isBuffer(from)) {
@@ -639,7 +636,6 @@ Script.buildP2SHMultisigIn = function(pubkeys, threshold, signatures, opts) {
  * @param {(Address|PublicKey)} to - destination address or public key
  */
 Script.buildPublicKeyHashOut = function(to) {
-  var Address = require('../address');
   $.checkArgument(!_.isUndefined(to));
   $.checkArgument(to instanceof PublicKey || to instanceof Address || _.isString(to));
   if (to instanceof PublicKey) {
@@ -692,7 +688,6 @@ Script.buildDataOut = function(data) {
  * @returns {Script} new pay to script hash script for given script
  */
 Script.buildScriptHashOut = function(script) {
-  var Address = require('../address');
   $.checkArgument(script instanceof Script ||
     (script instanceof Address && script.isPayToScriptHash()));
   var s = new Script();
@@ -745,7 +740,6 @@ Script.prototype.toScriptHashOut = function() {
  * @return {Script} an output script built from the address
  */
 Script.fromAddress = function(address) {
-  var Address = require('../address');
   address = Address(address);
   if (address.isPayToScriptHash()) {
     return Script.buildScriptHashOut(address);
@@ -761,7 +755,6 @@ Script.fromAddress = function(address) {
  * for this script if any, or false
  */
 Script.prototype.getAddressInfo = function() {
-  var Address = require('../address');
   var info = {};
   if (this.isScriptHashOut()) {
     info.hashBuffer = this.getData();
@@ -787,7 +780,6 @@ Script.prototype.getAddressInfo = function() {
  * @return {Address|boolean} the associated address for this script if possible, or false
  */
 Script.prototype.toAddress = function(network) {
-  var Address = require('../address');
   network = Networks.get(network) || this._network || Networks.defaultNetwork;
   var info = this.getAddressInfo();
   if (!info) {