Initial state

Microsoft.AspNet.NodeServices.React/.gitignore

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+/bin/

Microsoft.AspNet.NodeServices.React/Content/Node/react-rendering.js

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+var fs = require('fs');
+var path = require('path');
+var React = require('react');
+var ReactDOMServer = require('react-dom/server');
+var createMemoryHistory = require('history/lib/createMemoryHistory');
+var babelCore = require('babel-core');
+var babelConfig = {};
+
+var origJsLoader = require.extensions['.js']; 
+require.extensions['.js'] = loadViaBabel;
+require.extensions['.jsx'] = loadViaBabel;
+
+function loadViaBabel(module, filename) {
+    // Assume that all the app's own code is ES2015+ (optionally with JSX), but that none of the node_modules are.
+    // The distinction is important because ES2015+ forces strict mode, and it may break ES3/5 if you try to run it in strict
+    // mode when the developer didn't expect that (e.g., current versions of underscore.js can't be loaded in strict mode). 
+    var useBabel = filename.indexOf('node_modules') < 0;
+    if (useBabel) {
+        var transformedFile = babelCore.transformFileSync(filename, babelConfig);
+        return module._compile(transformedFile.code, filename);        
+    } else {
+        return origJsLoader.apply(this, arguments);
+    }
+}
+
+module.exports = {
+    renderToString: function(callback, options) {
+        var resolvedPath = path.resolve(process.cwd(), options.moduleName);
+        var requestedModule = require(resolvedPath);
+        var component = requestedModule[options.exportName]; 
+        if (!component) {
+            throw new Error('The module "' + resolvedPath + '" has no export named "' + options.exportName + '"');
+        }
+        
+        var history = createMemoryHistory(options.baseUrl);
+        var reactElement = React.createElement(component, { history: history });
+        var html = ReactDOMServer.renderToString(reactElement);
+        callback(null, html);
+    }
+};

Microsoft.AspNet.NodeServices.React/ReactRenderer.cs

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+using System.Threading.Tasks;
+
+namespace Microsoft.AspNet.NodeServices.React
+{
+    public static class ReactRenderer
+    {
+        private static StringAsTempFile nodeScript;
+        private static NodeInstance nodeInstance = new NodeInstance();
+        
+        static ReactRenderer() {
+            // Consider populating this lazily
+            var script = EmbeddedResourceReader.Read(typeof (ReactRenderer), "/Content/Node/react-rendering.js");
+            nodeScript = new StringAsTempFile(script); // Will be cleaned up on process exit
+        }
+        
+        public static async Task<string> RenderToString(string moduleName, string exportName, string baseUrl) {
+            return await nodeInstance.InvokeExport(nodeScript.FileName, "renderToString", new {
+                moduleName,
+                exportName,
+                baseUrl
+            });
+        }
+    }
+}

Microsoft.AspNet.NodeServices.React/project.json

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+{
+  "version": "1.0.0-alpha1",
+  "description": "Microsoft.AspNet.NodeServices.React Class Library",
+  "authors": [
+    "Microsoft"
+  ],
+  "tags": [
+    ""
+  ],
+  "projectUrl": "",
+  "licenseUrl": "",
+  "tooling": {
+    "defaultNamespace": "Microsoft.AspNet.NodeServices.React"
+  },
+  "frameworks": {
+    "dnx451": {},
+    "dnxcore50": {
+      "dependencies": {
+        "Microsoft.CSharp": "4.0.1-beta-*",
+        "System.Collections": "4.0.11-beta-*",
+        "System.Linq": "4.0.1-beta-*",
+        "System.Runtime": "4.0.21-beta-*",
+        "System.Threading": "4.0.11-beta-*"
+      }
+    }
+  },
+  "dependencies": {
+    "Microsoft.AspNet.NodeServices": "1.0.0-alpha1"
+  },
+  "resource": [
+    "Content/**/*"
+  ]
+}