Per single furni import, patchLocalizedFurniDataEntries ran for every
language and did a full 100k-entry JSON.parse + scan + JSON.stringify on the
main thread. That CPU spike is now offloaded to the translation worker
(init/prepare/finalize reuses the same pure core helpers), so importing
never blocks the event loop. The main thread only does async file I/O and the
network LibreTranslate calls. Falls back to the same helpers on the main
thread if no worker is available.
Also cache readFurniData() by file mtime+size so the 100k-entry JSON is
parsed once per change instead of on every import/fix/reconcile read
(invalidated on write).
The translation build's CPU-heavy work (deep clone of the 100k+ entry
master, the two full scans and JSON.stringify per language) now runs in a
worker thread, so "Alles vertalen" no longer blocks the main event loop.
Network/DB parts (official Habbo fetch, LibreTranslate, file writes) stay
on the main thread. The pure helpers were extracted to furni-data-i18n-core
(no server-only deps) so the worker can import them. Falls back to the same
helpers on the main thread when no worker is available or in tests.
openhands