API Reference > imodeljs-backend > iModels > BriefcaseManager > initialize initialize MethodStatic Initialize BriefcaseManager initialize(cacheRootDir: string, compatibilityDir?: string): void note It is perfectly valid for applications to store briefcases in locations they manage, outside of cacheRootDir. Parameter Type Description cacheRootDir string The root directory for storing a cache of downloaded briefcase files on the local computer.Briefcases are stored relative to this path in sub-folders organized by IModelId. compatibilityDir string Returns - void Defined in core/backend/src/BriefcaseManager.ts Line 107 Last Updated: 29 November, 2022