Start using getProjectRoot() + getWatchFolders() internally

Reviewed By: davidaurelio

Differential Revision: D8538601

fbshipit-source-id: bf52cf2bf5a24992dcb9903d13d36537adc5dbd1

Author: rafeca

packages/metro/src/rn-cli.config.js

@@ -15,8 +15,17 @@ const blacklist = require('./blacklist');
 const path = require('path');
 
 module.exports = {
-  getProjectRoots() {
-    return this._getRoots();
+  getProjectRoot() {
+    // Match on either path separator
+    if (__dirname.match(/node_modules[\/\\]metro(-bundler)?$/)) {
+      // Metro Bundler is running from node_modules of another project
+      return path.resolve(__dirname, '../../..');
+    } else if (__dirname.match(/Pods\/React\/packager$/)) {
+      // Metro Bundler is running from node_modules of another project
+      return path.resolve(__dirname, '../../..');
+    } else {
+      return path.resolve(__dirname, '..');
+    }
   },
 
   getAssetExts() {
@@ -31,19 +40,6 @@ module.exports = {
     return blacklist();
   },
 
-  _getRoots() {
-    // match on either path separator
-    if (__dirname.match(/node_modules[\/\\]metro(-bundler)?$/)) {
-      // Metro Bundler is running from node_modules of another project
-      return [path.resolve(__dirname, '../../..')];
-    } else if (__dirname.match(/Pods\/React\/packager$/)) {
-      // Metro Bundler is running from node_modules of another project
-      return [path.resolve(__dirname, '../../..')];
-    } else {
-      return [path.resolve(__dirname, '..')];
-    }
-  },
-
   getTransformModulePath() {
     return require.resolve('./reactNativeTransformer');
   },