Make render-server able to load TS/ES2015 without precompilation

samples/react/MusicStore/ReactApp/fx/render-server.js

@@ -1,30 +1,16 @@
+require('./require-ts-babel')(); // Enable loading TS/TSX/JSX/ES2015 modules
 var url = require('url');
-var babelCore = require('babel-core');
-var babelConfig = {
-    presets: ["es2015", "react"]
-};
+var domainTasks = require('./domain-tasks.ts');
 
-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);
+function render(bootModulePath, requestUrl, callback) {
+    var bootFunc = require(bootModulePath);
+    if (typeof bootFunc !== 'function') {
+        bootFunc = bootFunc.default;
     }
-}
-
-var domainTasks = require('./domain-tasks.js');
-var bootServer = require('../boot-server.jsx').default;
-
-function render(requestUrl, callback) {
+    if (typeof bootFunc !== 'function') {
+        throw new Error('The module at ' + bootModulePath + ' must export a default function, otherwise we don\'t know how to invoke it.')   
+    }
+    
     var params = {
         location: url.parse(requestUrl),
         url: requestUrl,
@@ -36,7 +22,7 @@ function render(requestUrl, callback) {
         // Since route matching is asynchronous, add the rendering itself to the list of tasks we're awaiting
         domainTasks.addTask(new Promise(function (resolve, reject) {
             // Now actually perform the first render that will match a route and commence associated tasks
-            bootServer(params, function(error, result) {
+            bootFunc(params, function(error, result) {
                 if (error) {
                     reject(error);
                 } else {
@@ -51,7 +37,7 @@ function render(requestUrl, callback) {
         // By now, all the data should be loaded, so we can render for real based on the state now
         // TODO: Add an optimisation where, if domain-tasks had no outstanding tasks at the end of
         // the previous render, we don't re-render (we can use the previous html and state).
-        bootServer(params, callback);
+        bootFunc(params, callback);
     }).catch(function(error) {
         process.nextTick(() => { // Because otherwise you can't throw from inside a catch
             callback(error, null);
@@ -59,7 +45,7 @@ function render(requestUrl, callback) {
     });
 }
 
-render('/', (err, html) => {
+render('../boot-server.tsx', '/', (err, html) => {
     if (err) {
         throw err;
     }

samples/react/MusicStore/ReactApp/fx/require-ts-babel.js

@@ -0,0 +1,44 @@
+var fs = require('fs');
+var ts = require('ntypescript');
+var babelCore = require('babel-core');
+var resolveBabelRc = require('babel-loader/lib/resolve-rc'); // If this ever breaks, we can easily scan up the directory hierarchy ourselves 
+var origJsLoader = require.extensions['.js'];
+
+function resolveBabelOptions(relativeToFilename) {
+    var babelRcText = resolveBabelRc(relativeToFilename);
+    return babelRcText ? JSON.parse(babelRcText) : {};
+}
+
+function loadViaTypeScript(module, filename) {
+    // First perform a minimal transpilation from TS code to ES2015. This is very fast (doesn't involve type checking)
+    // and is unlikely to need any special compiler options
+    var src = fs.readFileSync(filename, 'utf8');
+    var compilerOptions = { jsx: ts.JsxEmit.Preserve, module: ts.ModuleKind.ES2015, target: ts.ScriptTarget.ES6 };
+    var es6Code = ts.transpile(src, compilerOptions, 'test.tsx', /* diagnostics */ []);
+    
+    // Second, process the ES2015 via Babel. We have to do this (instead of going directly from TS to ES5) because
+    // TypeScript's ES5 output isn't exactly compatible with Node-style CommonJS modules. The main issue is with
+    // resolving default exports - https://github.com/Microsoft/TypeScript/issues/2719
+    var es5Code = babelCore.transform(es6Code, resolveBabelOptions(filename)).code;
+    return module._compile(es5Code, filename);
+}
+
+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, resolveBabelOptions(filename));
+        return module._compile(transformedFile.code, filename);
+    } else {
+        return origJsLoader.apply(this, arguments);
+    }
+}
+
+module.exports = function register() {
+    require.extensions['.js'] = loadViaBabel;
+    require.extensions['.jsx'] = loadViaBabel;
+    require.extensions['.ts'] = loadViaTypeScript;
+    require.extensions['.tsx'] = loadViaTypeScript;
+}

samples/react/MusicStore/package.json

@@ -22,6 +22,7 @@
     "bootstrap": "^3.3.6",
     "domain-context": "^0.5.1",
     "isomorphic-fetch": "^2.2.1",
+    "ntypescript": "^1.201602072208.1",
     "react": "^0.14.7",
     "react-bootstrap": "^0.28.2",
     "react-dom": "^0.14.7",