react-native-fs/Downloader.h

#import <Foundation/Foundation.h>

typedef void (^DownloadCompleteCallback)(NSNumber*, NSNumber*);
typedef void (^ErrorCallback)(NSError*);
typedef void (^BeginCallback)(NSNumber*, NSNumber*, NSDictionary*);
typedef void (^ProgressCallback)(NSNumber*, NSNumber*);
typedef void (^ResumableCallback)();

@interface RNFSDownloadParams : NSObject

@property (copy) NSString* fromUrl;
@property (copy) NSString* toFile;
@property (copy) NSDictionary* headers;
@property (copy) DownloadCompleteCallback completeCallback;   // Download has finished (data written)
@property (copy) ErrorCallback errorCallback;                 // Something went wrong
@property (copy) BeginCallback beginCallback;                 // Download has started (headers received)
@property (copy) ProgressCallback progressCallback;           // Download is progressing
@property (copy) ResumableCallback resumableCallback;         // Download has stopped but is resumable
@property        bool background;                             // Whether to continue download when app is in background
@property (copy) NSNumber* progressDivider;


@end

@interface RNFSDownloader : NSObject <NSURLSessionDelegate, NSURLSessionDownloadDelegate>

- (NSString *)downloadFile:(RNFSDownloadParams*)params;
- (void)stopDownload;
- (void)resumeDownload;
- (BOOL)isResumable;

@end