Fix Flipper lints #12

Reviewed By: timur-valiev

Differential Revision: D31932981

fbshipit-source-id: 4cf905495494466462c0494116f56cd16773e549

desktop/plugin-lib/src/getSourcePlugins.ts

@@ -50,7 +50,7 @@ async function entryPointForPluginFolder(
   pluginsDir: string,
 ): Promise<{[key: string]: InstalledPluginDetails}> {
   pluginsDir = expandTilde(pluginsDir);
-  if (!fs.existsSync(pluginsDir)) {
+  if (!(await fs.pathExists(pluginsDir))) {
     return {};
   }
   return await fs