Skip stat call / throwing when files don't exist (#225)

src/filesystem.ts

@@ -33,6 +33,10 @@ export interface ReadJsonAsync {
 }
 
 export function fileExistsSync(path: string): boolean {
+  // If the file doesn't exist, avoid throwing an exception over the native barrier for every miss
+  if (!fs.existsSync(path)) {
+    return false;
+  }
   try {
     const stats = fs.statSync(path);
     return stats.isFile();