Typescriptify the main process code (1/N)

Summary:
As a first step I've configured bundling for the main process code using Metro. For now I haven't converted anything to ts, just made that possible.

The bundle is just produced into the "static" directory. To avoid too many changes I kept the "static" folder as it is, but probably non-static code should be moved from there.

Also installed modules from "node_modules" for the main process are not bundled to avoid potential issues with node native modules.

Reviewed By: mweststrate

Differential Revision: D19960982

fbshipit-source-id: efbd426254e2b37c913c5f5f75f042c50ccee2f3

static/transforms/electron-requires-main.js

@@ -0,0 +1,37 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ *
+ * @format
+ */
+
+function isRequire(node) {
+  return (
+    node.type === 'CallExpression' &&
+    node.callee.type === 'Identifier' &&
+    node.callee.name === 'require' &&
+    node.arguments.length === 1 &&
+    node.arguments[0].type === 'StringLiteral'
+  );
+}
+
+module.exports = function(babel, options) {
+  return {
+    name: 'change-electron-to-electronRequire-in-main',
+    visitor: {
+      CallExpression(path) {
+        if (!isRequire(path.node)) {
+          return;
+        }
+
+        const source = path.node.arguments[0].value;
+
+        if (!source.startsWith('./')) {
+          path.node.callee.name = 'electronRequire';
+        }
+      },
+    },
+  };
+};