Require d3 directly to better support Node usage

src/diagrams/sequenceDiagram/d3.js

@@ -0,0 +1,15 @@
+/* global window */
+
+var d3;
+
+if (require) {
+  try {
+    d3 = require("d3");
+  } catch (e) {}
+}
+
+if (!d3) {
+  d3 = window.d3;
+}
+
+module.exports = d3;

src/diagrams/sequenceDiagram/sequenceDiagram.spec.js

@@ -1,8 +1,16 @@
 /**
  * Created by knut on 14-11-18.
  */
+var proxyquire = require('proxyquire');
+
+var newD3;
+var d3 = {
+    select:function(){
+        return new newD3();
+    }
+};
 var sq = require('./parser/sequenceDiagram').parser;
-var sd = require('./sequenceRenderer');
+var sd = proxyquire('./sequenceRenderer', { './d3': d3 });
 
 var str;
 describe('when parsing a sequenceDiagram',function() {
@@ -480,7 +488,7 @@ describe('when rendering a sequenceDiagram',function() {
         };
         sq.yy.parseError = parseError;
 
-        function newD3() {
+        newD3 = function() {
             var o = {
                 append: function (type) {
                     return newD3();
@@ -508,16 +516,8 @@ describe('when rendering a sequenceDiagram',function() {
             };
 
             return o;
-        }
-
-        var _d3 = {
-            select:function(){
-                return new newD3();
-            }
         };
 
-        d3 = _d3;
-
         conf = {
             diagramMarginX:50,
             diagramMarginY:10,

src/diagrams/sequenceDiagram/sequenceRenderer.js

@@ -1,4 +1,3 @@
-/* globals d3 */
 /**
  * Created by knut on 14-11-23.
  */
@@ -6,6 +5,7 @@
 var sq = require('./parser/sequenceDiagram').parser;
 sq.yy = require('./sequenceDb');
 var svgDraw = require('./svgDraw');
+var d3 = require('./d3');
 var conf = {
 
     diagramMarginX:50,