Method filterFn

packages/db/src/collection/subscription.ts:460–471

(key: string | number | undefined)

      : undefined

    const filterFn = (key: string | number | undefined): boolean => {
      if (key !== undefined && this.sentKeys.has(key)) {
        return false
      }

      const value = this.collection.get(key)
      if (value === undefined) {
        return false
      }

      return whereFilterFn?.(value) ?? true
    }

    let biggestObservedValue = minValueForIndex
    const changes: Array<ChangeMessage<any, string | number>> = []