Function subscribe

packages/desktop/src/main/updater-controller.ts:68–72

(listener: (state: UpdaterState) => void)

  return {
    getState: () => state,
    subscribe(listener: (state: UpdaterState) => void) {
      listeners.add(listener)
      listener(state)
      return () => listeners.delete(listener)
    },
    async start() {
      const ready = await input.persistence.get()
      if (ready?.version === input.currentVersion) await input.persistence.clear()