Method removeFromMap

packages/vite/src/shared/hmr.ts:134–145

(map: Map<string, any[]>)

    cb: (payload: InferCustomEventPayload<T>) => void,
  ): void {
    const removeFromMap = (map: Map<string, any[]>) => {
      const existing = map.get(event)
      if (existing === undefined) {
        return
      }
      const pruned = existing.filter((l) => l !== cb)
      if (pruned.length === 0) {
        map.delete(event)
        return
      }
      map.set(event, pruned)
    }
    removeFromMap(this.hmrClient.customListenersMap)
    removeFromMap(this.newListeners)
  }