run app server in dev mode with babel-register (#661)

packages/electrode-archetype-react-app/arch-clap.js

@@ -572,12 +572,13 @@ Individual .babelrc files were generated for you in src/client and src/server
           .map(n => `--watch ${n}`)
           .join(" ");
         AppMode.setEnv(AppMode.src.dir);
-        const node = AppMode.isSrc ? `babel-node` : "node";
-        const serverIndex = Path.join(AppMode.src.server, "index.js");
+        const nodeRunApp = AppMode.isSrc
+          ? `node ${archetype.dir}/support/babel-run ${AppMode.src.server}`
+          : `node ${AppMode.src.server}`;
         return exec(
           `nodemon`,
           `--delay 1 -C --ext js,jsx,json,yaml ${watches}`,
-          `--exec ${node} ${serverIndex}`
+          `--exec ${nodeRunApp}`
         );
       }
     },

packages/electrode-archetype-react-app/support/babel-run.js

@@ -0,0 +1,30 @@
+"use strict";
+
+/*
+ * Start user's app server from src/server directory in dev mode.
+ *
+ * - If user has src/server/dev.js, then just requires that, and expect
+ *   user does all the babel register setup etc in that file.
+ * - otherwise load babel-register, with babel config to process files
+ *   that are only under CWD and not within CWD/node_modules.
+ *
+ * This allows symlinked node modules to work in dev mode without babel
+ * trying to load .babelrc or process files from them.
+ *
+ */
+const Path = require("path");
+
+const serverDir = process.argv[2] || "src/server";
+
+try {
+  // Try to load user's dev.js under src/server
+  require(Path.resolve(serverDir, "dev.js"));
+} catch (e) {
+  const cwdNM = Path.resolve("node_modules");
+  const cwd = process.cwd();
+
+  // fallback to default action that loads babel-register and then requires
+  // src/server, under which there should be an index.js file.
+  require("babel-register")({ only: x => x.startsWith(cwd) && !x.startsWith(cwdNM) });
+  require(Path.resolve(serverDir));
+}