fix: config.reporter undefined bug (#376)

* fix: config.reporter undefined bug

* refactor

* Update loadMetroConfig.js

packages/cli/src/tools/loadMetroConfig.js

@@ -82,8 +82,18 @@ export type ConfigOptionsT = {|
  */
 export default function load(ctx: ConfigT, options?: ConfigOptionsT) {
   const defaultConfig = getDefaultConfig(ctx);
-  return loadConfig(
-    {cwd: ctx.root, ...options},
-    {...defaultConfig, reporter: options && options.reporter},
-  );
+  if (options && options.reporter) {
+    /**
+     * $FlowIssue: Metro doesn't accept `reporter` to be passed along other options
+     * and will ignore the value, if provided.
+     *
+     * We explicitly read `reporter` value and set it on a default configuration. Note
+     * that all other options described in the `ConfigOptionsT` are handled by Metro
+     * automatically.
+     *
+     * This is a temporary workaround.
+     */
+    defaultConfig.reporter = options.reporter;
+  }
+  return loadConfig({cwd: ctx.root, ...options}, defaultConfig);
 }