use getters for api versions in node

scripts/generate/api_index.js

@@ -15,7 +15,7 @@ module.exports = function (done) {
 
   console.log(chalk.white.bold('wrote'), 'api index to', nodeApiIndex);
 
-  write(browserApiIndex, require('./templates').apiIndex({
+  write(browserApiIndex, require('./templates').apiIndexBrowser({
     branches: utils.browserBranches
   }), 'utf8');
 

scripts/generate/templates/api_index.tmpl

@@ -1,14 +1,14 @@
 module.exports = {
 <%
 
+
   branches.forEach(function (branch, i, list) {
-    var req = "require('./" + _.snakeCase(branch) + "')";
-    if (branch === utils.branches._default) {
-      print("  '_default': " + req + ',\n');
+    function printVersion(name) {
+      print(`  get '${name}'() { return require('./${_.snakeCase(branch)}'); },\n`)
     }
 
-    print("  '" + branch + "': " + req + (i === list.length - 1 ? '' : ',\n'));
+    if (branch === utils.branches._default) printVersion('_default');
+    printVersion(branch);
   });
 
-%>
-};
+%>};

scripts/generate/templates/api_index_browser.tmpl

@@ -0,0 +1,14 @@
+module.exports = {
+<%
+
+  branches.forEach(function (branch, i, list) {
+    var req = "require('./" + _.snakeCase(branch) + "')";
+    if (branch === utils.branches._default) {
+      print("  '_default': " + req + ',\n');
+    }
+
+    print("  '" + branch + "': " + req + (i === list.length - 1 ? '' : ',\n'));
+  });
+
+%>
+};

scripts/generate/templates/index.js

@@ -126,5 +126,6 @@ module.exports = {
   apiMethods: templates.api_methods,
   docsIndex: templates.docs_index,
   apiIndex: templates.api_index,
+  apiIndexBrowser: templates.api_index_browser,
   configurationDocs: templates.configuration_docs,
 };