message: Improve readability of 'toRelativeUrl'
diff: @@ -118,5 +118,5 @@ export function toRelativeUrl(root: string, path: string): string {
  }
  // Make sure we add a '../' for each component we removed from the root.
  - return Array(level + 1).join('../') + path.substr(root.length + 1);
  + return '../'.repeat(level) + path.substr(root.length + 1);
  }
  