Method flattenCollectionIds

server/src/validator.ts:688–703

(
    selectors: CollectionSelector[] | undefined,
    normalizedDomain: string
  )

  }

  private flattenCollectionIds(
    selectors: CollectionSelector[] | undefined,
    normalizedDomain: string
  ): string[] | undefined {
    if (!selectors?.length) {
      return undefined;
    }

    return [
      ...new Set(
        selectors
          .filter((selector) => this.normalizeDomain(selector.publisher_domain) === normalizedDomain)
          .flatMap((selector) => selector.collection_ids)
      ),
    ];
  }

  private resolveRequestedPlacements(
    normalizedDomain: string,