Function downloadFileToCacheDir
- downloadFileToCacheDir(params): Promise<string>
 Parameters
- params: { 
    cacheDir?: string; 
    fetch?: { 
        (input, init?): Promise<Response>; 
        (input, init?): Promise<Response>; 
    }; 
    hubUrl?: string; 
    localFileOnly?: boolean; 
    path: string; 
    raw?: boolean; 
    repo: RepoDesignation; 
    revision?: string; 
} & Partial<CredentialsParams> 
Returns Promise<string>
Download a given file if it's not already present in the local cache. Matches Python's hf_hub_download behavior by using branch HEAD commits.