navigator error

ReferenceError: navigator is not defined
src/lib/engine/worker.ts (50:16) @ getRecommendedWorkersNb

  48 |   const maxWorkersNbFromThreads = Math.max(
  49 |     1,
> 50 |     Math.round(navigator.hardwareConcurrency - 4),
     |                ^
  51 |     Math.floor((navigator.hardwareConcurrency * 2) / 3)
  52 |   );
  53 |