react-native-fs-turbo

• This library repeats all the methods of the original react-native-fs but all the code is executed synchronously in C++ files via JSI (and JNI) and written using TypeScript.

[!IMPORTANT] react-native-fs-turbo is a pure C++ TurboModule, and requires the new architecture to be enabled. (react-native 0.74+)

• If you want to use react-native-fs-turbo, you need to enable the new architecture in your app (see "Enable the New Architecture for Apps")
• If you cannot use the new architecture yet, use the standard react-native-fs library.

Benchmark

Benchmark tests of react-native-fs-turbo and react-native-fs libraries (iPhone 14, Samsung Galaxy Note 20 Ultra, release mode, 10,000 iterations)

Conducted 10 tests, showed average time (only basic functions tested)
serial - sequential async tests
parallel - parallel async tests (20 promises per batch)
readDir test checked reading of 10,000 files in a folder

Library	writeFile	appendFile	stat	unlink
react-native-fs (ios, serial)	7.855s	2.683s	1.595s	1.728s
react-native-fs (ios, parallel)	7.596s	2.719s	1.234s	1.480s
react-native-fs-turbo (ios)	4.849s (^1.6)	1.986s (^1.4)	0.267s (^4.6)	0.634s (^2.3)
react-native-fs (android, serial)	8.764s	6.320s	4.821s	4.307s
react-native-fs (android, parallel)	3.505s	2.856s	0.947s	0.892s
react-native-fs-turbo (android)	0.551s (^6.3)	0.199s (^14.4)	0.093s (^10.2)	0.251s (^3.6)

Library	readFile (utf8)	readFile (base64)
react-native-fs (ios, serial)	4.082s	3.058s
react-native-fs (ios, parallel)	3.020s	2.738s
react-native-fs-turbo (ios)	1.525s (^2.0)	1.617s (^1.7)
react-native-fs (android, serial)	10.533s	4.735s
react-native-fs (android, parallel)	1.944s	0.928s
react-native-fs-turbo (android)	0.209s (^9.3)	0.213s (^4.4)

Library	hash (md5)	hash (sha512)	readDir
react-native-fs (ios, serial)	3.073s	6.297s	1.077s
react-native-fs (ios, parallel)	2.675s	5.437s	1.059s
react-native-fs-turbo (ios)	1.541 (^1.7)	3.146s (^1.7)	0.269s (^3.9)
react-native-fs (android, serial)	5.218s	12.247s	0.303s
react-native-fs (android, parallel)	1.386s	3.525s	0.308s
react-native-fs-turbo (android)	0.231s (^6.0)	0.501s (^7.0)	0.081s (^3.8)

Installation

React Native

1yarn add react-native-fs-turbo
2cd ios && pod install

Usage

Import

Simply import the library anywhere. A single instance is used

1import RNFSTurbo from 'react-native-fs-turbo';

Examples

Basic

1import RNFSTurbo from 'react-native-fs-turbo';
2
3try {
4  const results = RNFSTurbo.readDir(RNFSTurbo.DocumentDirectoryPath, true); // use true as the second parameter to get a pure object without functions
5
6  const files: string = [];
7  const dirs: string = [];
8  results.forEach((dirStat) => {
9    if (dirStat.isFile) {
10      files.push(dirStat.path);
11    } else {
12      dirs.push(dirStat.path);
13    }
14  });
15} catch (err: Error) {
16  console.log(err.message);
17}

File creation

1import RNFSTurbo from 'react-native-fs-turbo';
2
3const pathUtf8 = `${RNFSTurbo.DocumentDirectoryPath}/test_utf8.txt`;
4const pathBase64 = `${RNFSTurbo.DocumentDirectoryPath}/test_base64.txt`;
5const pathUint8 = `${RNFSTurbo.DocumentDirectoryPath}/test_uint8.txt`;
6const pathFloat32 = `${RNFSTurbo.DocumentDirectoryPath}/test_float32.txt`;
7
8try {
9  RNFSTurbo.writeFile(path, 'Lorem ipsum dolor sit amet', 'utf8');
10  RNFSTurbo.writeFile(path, 'TG9yZW0gaXBzdW0gZG9sb3Igc2l0IGFtZXQ=', 'base64');
11  // An array with uint8 can be passed as input data
12  RNFSTurbo.writeFile(path, [76, 111, 114, 101, 109, 32, 105, 112, 115, 117, 109, 32, 100, 111, 108, 111, 114, 32, 115, 105, 116, 32, 97, 109, 101, 116], 'uint8');
13  // An array with float32 can be passed as input data
14  RNFSTurbo.writeFile(path, [0.4233244061470032, 0.5435456037521362, 2.5345540046691895, 7.2343244552612305, 3.867867946624756, 0.7876875996589661], 'float32');
15} catch (err: Error) {
16  console.log(err.message);
17}

File deletion

1import RNFSTurbo from 'react-native-fs-turbo';
2
3const path = `${RNFSTurbo.DocumentDirectoryPath}/test.txt`;
4
5try {
6  RNFSTurbo.unlink(path);
7} catch (err: Error) {
8  console.log(err.message);
9}

File upload

1import RNFSTurbo, { UploadFileItem } from 'react-native-fs-turbo';
2
3const uploadUrl = 'http://requestb.in/XXXXXXX';  // For testing purposes, go to http://requestb.in/ and create your own link
4// create an array of objects of the files you want to upload
5
6const files: UploadFileItem[] = [
7  {
8    name: 'test1',
9    filename: 'test1.w4a',
10    filepath: `${RNFSTurbo.DocumentDirectoryPath}/test1.w4a`,
11    filetype: 'audio/x-m4a',
12  },
13  {
14    name: 'test2',
15    filename: 'test2.w4a',
16    filepath: `${RNFSTurbo.DocumentDirectoryPath}/test2.w4a`,
17    filetype: 'audio/x-m4a',
18  },
19];
20
21const beginCallback = (res: UploadBeginCallbackResult) => {
22  const jobId = res.jobId;
23  console.log('Upload has begun. Job id', jobId);
24};
25
26const progressCallback = (res: UploadProgressCallbackResult) => {
27  const percentage = Math.floor(
28    (res.totalBytesSent / res.totalBytesExpectedToSend) * 100,
29  );
30  console.log('Upload progress', percentage);
31};
32
33const completeCallback = (res: UploadResult) => {
34  if (res.statusCode === 200) {
35    console.log('Files uploaded'); // response.statusCode, response.headers, response.body
36  } else {
37    console.log('Server error');
38  }
39};
40
41const errorCallback = (err: UploadError) => {
42  if (err.errorMessage === 'cancelled') {
43    // cancelled by user
44  }
45  console.log('Error', err);
46};
47
48// Pass a completion callback and an error callback as the second and third parameters to get rid of promises
49const uploadJob = RNFSTurbo.uploadFiles(
50  {
51    toUrl: uploadUrl,
52    files: files,
53    method: 'POST',
54    headers: {},
55    fields: {
56      submit: 'yes',
57    },
58    begin: beginCallback,
59    progress: progressCallback,
60  },
61  completeCallback,
62  errorCallback,
63);
64console.log('Upload job id', uploadJob.jobId);

API

Constants

The following constants are available on the RNFSTurbo export:

• MainBundlePath (string) The absolute path to the main bundle directory (iOS only)
• CachesDirectoryPath (string) The absolute path to the caches directory
• ExternalCachesDirectoryPath (string) The absolute path to the external caches directory (Android only)
• DocumentDirectoryPath (string) The absolute path to the document directory
• DownloadDirectoryPath (string) The absolute path to the download directory (Android only)
• TemporaryDirectoryPath (string) The absolute path to the temporary directory (falls back to Caching-Directory on Android)
• LibraryDirectoryPath (string) The absolute path to the NSLibraryDirectory (iOS only)
• ExternalDirectoryPath (string) The absolute path to the external files, shared directory (Android only)
• ExternalStorageDirectoryPath (string) The absolute path to the external storage, shared directory (Android only)
• PicturesDirectoryPath (string) The absolute path to the pictures directory (Android only)
• RoamingDirectoryPath (string) The absolute path to the roaming directory (Not available)

IMPORTANT: when using ExternalStorageDirectoryPath it's necessary to request permissions (on Android) to read and write on the external storage, here an example: React Native Offical Doc

stat(filepath: string, isNewFormat?: boolean): StatResult

Stats an item at filepath. If the filepath is linked to a virtual file, for example Android Content URI, the originalPath can be used to find the pointed file path. The promise resolves with an object with the following properties:

1type StatResult = {
2  path: string; // The same as filepath argument
3  ctime: Date | number; // The creation date of the file (Date for old format, number (unixtime, sec) for new format)
4  mtime: Date | number; // The last modified date of the file (Date for old format, number (unixtime, sec) for new format)
5  size: number; // Size in bytes
6  mode: number; // UNIX file mode
7  originalFilepath: string; // ANDROID: In case of content uri this is the pointed file path, otherwise is the same as path
8  isFile: boolean | () => boolean; // Is the file just a file? Will be boolean if passed isNewFormat=true
9  isDirectory: boolean | () => boolean; // Is the file a directory? Will be boolean if passed isNewFormat=true
10};

Note: additional conversion of unixtime (number) to Date takes time, so number (unixtime, sec) is returned in the new format. For backward compatibility, the Date is returned in the old format.

readDir(dirpath: string, isNewFormat?: boolean): ReadDirItem[]

Reads the contents of path. This must be an absolute path. Use the above path constants to form a usable file path.

The returned promise resolves with an array of objects with the following properties:

1type ReadDirItem = {
2  ctime: Date | number; // The creation date of the file (iOS only) (Date for old format, number (unixtime, sec) for new format)
3  mtime: Date | number; // The last modified date of the file (Date for old format, number (unixtime, sec) for new format)
4  name: string; // The name of the item
5  path: string; // The absolute path to the item
6  size: string; // Size in bytes
7  isFile: boolean | () => boolean; // Is the file just a file? Will be boolean if passed isNewFormat=true
8  isDirectory: boolean | () => boolean; // Is the file a directory? Will be boolean if passed isNewFormat=true
9};

Note: additional conversion of unixtime (number) to Date takes time, so number (unixtime, sec) is returned in the new format. For backward compatibility, the Date is returned in the old format.

(Android only) readDirAssets(dirpath: string, isNewFormat?: boolean): ReadDirItem[]

Reads the contents of dirpath in the Android app's assets folder. dirpath is the relative path to the file from the root of the assets folder.

The returned promise resolves with an array of objects with the following properties:

1type ReadDirItem = {
2  name: string;     // The name of the item
3  path: string;     // The absolute path to the item
4  size: string;     // Size in bytes.
5  						// Note that the size of files compressed during the creation of the APK (such as JSON files) cannot be determined.
6  						// `size` will be set to -1 in this case.
7  isFile: boolean | () => boolean;        // Is the file just a file? Will be boolean if passed isNewFormat=true
8  isDirectory: boolean | () => boolean;   // Is the file a directory? Will be boolean if passed isNewFormat=true
9};

readdir(dirpath: string) => string[]

Node.js style version of readDir that returns only the names. Note the lowercase d.

readFile(filepath: string, options?: ReadOptions): string | number[]

Reads the file at path and return contents. options can be string of encrypted types or object, default is utf8. Use base64 or uint8 or float32 encoding for reading binary files.

1type ReadOptions =
2  | 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32'
3  | { encoding: 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32' };

Note: you will take quite a performance hit if you are reading big files

read(filepath: string, length: number, position: number, options?: ReadOptions): string | number[]

Reads length bytes from the given position of the file at path and returns contents. options can be string of encrypted types or object, default is utf8. Use base64 or uint8 or float32 encoding for reading binary files.

1type ReadOptions =
2  | 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32'
3  | { encoding: 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32' };

Note: reading big files piece by piece using this method may be useful in terms of performance. Note: float32 size is 4 bytes, so position and length should be specified in bytes (multiplied by 4)

(Android only) readFileAssets(filepath: string, options?: ReadOptions) => string[]

Reads the file at path in the Android app's assets folder and return contents. options can be string of encrypted types or object, default is utf8. Use base64 encoding for reading binary files.

filepath is the relative path to the file from the root of the assets folder.

1type ReadOptions =
2  | 'utf8' | 'ascii' | 'base64'
3  | { encoding: 'utf8' | 'ascii' | 'base64' };

(Android only) readFileRes: (filepath: string, options?: ReadOptions) => string[]

Reads the file named filename in the Android app's res folder and return contents. Only the file name (not folder) needs to be specified. The file type will be detected from the extension and automatically located within res/drawable (for image files) or res/raw (for everything else). options can be string of encrypted types or object, default is utf8. Use base64 encoding for reading binary files.

1type ReadOptions =
2  | 'utf8' | 'ascii' | 'base64'
3  | { encoding: 'utf8' | 'ascii' };

writeFile(filepath: string, contents: string | number[], options?: WriteOptions): void

Write the contents to filepath. options can be string of encrypted types or object, default is utf8

1type WriteOptions =
2  | 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32'
3  | {
4      encoding?: 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32',
5      NSFileProtectionKey?:
6        |"NSFileProtectionNone"
7        | "NSFileProtectionComplete"
8        | "NSFileProtectionCompleteUnlessOpen"
9        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
10        | "NSFileProtectionCompleteWhenUserInactive" // iOS 17+ only
11    };

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms.

appendFile(filepath: string, contents: string | number[], options?: WriteOptions): void

Append the contents to filepath. encoding can be string of encrypted types or object, default is utf8.

1type WriteOptions =
2  | 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32'
3  | {
4      encoding?: 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32',
5      NSFileProtectionKey?:
6        |"NSFileProtectionNone"
7        | "NSFileProtectionComplete"
8        | "NSFileProtectionCompleteUnlessOpen"
9        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
10        | "NSFileProtectionCompleteWhenUserInactive" // iOS 17+ only
11    };

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms.

write(filepath: string, contents: string | number[], position?: number, options?: WriteOptions): void

Write the contents to filepath at the given random access position. When position is undefined or -1 the contents is appended to the end of the file. encoding can be string of encrypted types or object, default is utf8.

1type WriteOptions =
2  | 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32'
3  | {
4      encoding?: 'utf8' | 'ascii' | 'base64' | 'uint8' | 'float32',
5      NSFileProtectionKey?:
6        |"NSFileProtectionNone"
7        | "NSFileProtectionComplete"
8        | "NSFileProtectionCompleteUnlessOpen"
9        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
10        | "NSFileProtectionCompleteWhenUserInactive" // iOS 17+ only
11    };

Note: float32 size is 4 bytes, so position should be specified in bytes (multiplied by 4)

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms.

moveFile(filepath: string, destPath: string, options?: MoveCopyOptions): void

Moves the file located at filepath to destPath. This is more performant than reading and then re-writing the file data because the move is done natively and the data doesn't have to be copied or cross the bridge.

1type MoveCopyOptions =
2  | {
3      NSFileProtectionKey?:
4        |"NSFileProtectionNone"
5        | "NSFileProtectionComplete"
6        | "NSFileProtectionCompleteUnlessOpen"
7        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
8        | "NSFileProtectionCompleteWhenUserInactive" // iOS 17+ only
9    };

Note: Overwrites existing file

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms.

copyFolder(srcFolderPath: string, destFolderPath: string, options?: MoveCopyOptions): void

Copies the contents located at srcFolderPath to destFolderPath.

1type MoveCopyOptions =
2  | {
3      NSFileProtectionKey?:
4        |"NSFileProtectionNone"
5        | "NSFileProtectionComplete"
6        | "NSFileProtectionCompleteUnlessOpen"
7        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
8        | "NSFileProtectionCompleteWhenUserInactive" // iOS 17+ only
9    };

Note: Recursively replaces all files and folders

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms.

copyFile(filepath: string, destPath: string, options?: MoveCopyOptions): void

Copies the file located at filepath to destPath.

1type MoveCopyOptions =
2  | {
3      NSFileProtectionKey?:
4        |"NSFileProtectionNone"
5        | "NSFileProtectionComplete"
6        | "NSFileProtectionCompleteUnlessOpen"
7        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
8        | "NSFileProtectionCompleteWhenUserInactive" // iOS 17+ only
9    };

Note: Error will be thrown if the file already exists.

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms.

(Android only) copyFileAssets(filepath: string, destPath: string): void

Copies the file at filepath in the Android app's assets folder and copies it to the given destPath path.

Note: Will overwrite destPath if it already exists.

(Android only) copyFileRes(filepath: string, destPath: string): void

Copies the file named filename in the Android app's res folder and copies it to the given destPath path. res/drawable is used as the source parent folder for image files, res/raw for everything else.

Note: Will overwrite destPath if it already exists.

(iOS only) copyAssetsFileIOS(imageUri: string, destPath: string, width: number, height: number, scale?: number, compression?: number, resizeMode?: string): string | undefined

Not available on Mac Catalyst.

Reads an image file from Camera Roll and writes to destPath. This method assumes the image file to be JPEG file. This method will download the original from iCloud if necessary.

Parameters

imageUri string (required)

URI of a file in Camera Roll. Can be either of the following formats:

• ph://CC95F08C-88C3-4012-9D6D-64A413D254B3/L0/001
• assets-library://asset/asset.JPG?id=CC95F08C-88C3-4012-9D6D-64A413D254B3&ext=JPG

destPath string (required)

Destination to which the copied file will be saved, e.g. RNFS.TemporaryDirectoryPath + 'example.jpg'.

width number (required)

Copied file's image width will be resized to width. If 0 is provided, width won't be resized.

height number (required)

Copied file's image height will be resized to height. If 0 is provided, height won't be resized.

scale number (optional)

Copied file's image will be scaled proportional to scale factor from width x height. If both width and height are 0, the image won't scale. Range is [0.0, 1.0] and default is 1.0.

compression number (optional)

Quality of copied file's image. The value 0.0 represents the maximum compression (or lowest quality) while the value 1.0 represents the least compression (or best quality). Range is [0.0, 1.0] and default is 1.0.

resizeMode string (optional)

If resizeMode is 'contain', copied file's image will be scaled so that its larger dimension fits width x height. If resizeMode is other value than 'contain', the image will be scaled so that it completely fills width x height. Default is 'contain'. Refer to PHImageContentMode.

Return value

Promise<string>

Copied file's URI.

Video-Support

One can use this method also to create a thumbNail from a video in a specific size. Currently it is impossible to specify a concrete position, the OS will decide wich Thumbnail you'll get then. To copy a video from assets-library and save it as a mp4-file, refer to copyAssetsVideoIOS.

Further information: https://developer.apple.com/reference/photos/phimagemanager/1616964-requestimageforasset The promise will on success return the final destination of the file, as it was defined in the destPath-parameter.

(iOS only) copyAssetsVideoIOS(videoUri: string, destPath: string): string | undefined

Not available on Mac Catalyst.

Copies a video from assets-library, that is prefixed with 'assets-library://asset/asset.MOV?...' to a specific destination.

unlink(filepath: string, checkExistence?: boolean = true): void

Unlinks the item at filepath. If the item does not exist, an error will be thrown. Second parameter checkExistence is optional and checks the existence of a file or folder before deleting it (if the file or folder doesn't exist, an error is thrown). By default, checkExistence = true for backward compatibility with react-native-fs

Also recursively deletes directories (works like Linux rm -rf).

exists(filepath: string) => boolean

Check if the item exists at filepath. If the item does not exist, return false.

(Android only) existsAssets(filepath: string) => boolean

Check in the Android assets folder if the item exists. filepath is the relative path from the root of the assets folder. If the item does not exist, return false.

(Android only) existsRes(filepath: string): boolean

Check in the Android res folder if the item named filename exists. res/drawable is used as the parent folder for image files, res/raw for everything else. If the item does not exist, return false.

hash(filepath: string, algorithm: Algorithms): string

Reads the file at path and returns its checksum as determined by algorithm.

1type Algorithms =
2  | "md5"
3  | "sha1"
4  | "sha224"
5  | "sha256"
6  | "sha384"
7  | "sha512";

touch(filepath: string, mtime?: Date | number, ctime?: Date | number): number

Sets the modification timestamp mtime of the file at filepath.

Note: ctime no longer supported

mkdir(filepath: string, options?: MkdirOptions): void

Create a directory at filepath. Automatically creates parents and does not throw if already exists (works like Linux mkdir -p).

1type MkdirOptions =
2  | {
3      NSFileProtectionKey?:
4        |"NSFileProtectionNone"
5        | "NSFileProtectionComplete"
6        | "NSFileProtectionCompleteUnlessOpen"
7        | "NSFileProtectionCompleteUntilFirstUserAuthentication"
8        | "NSFileProtectionCompleteWhenUserInactive"; // iOS 17+ only
9      NSURLIsExcludedFromBackupKey?: boolean;
10    };

(IOS only): options.NSFileProtectionKey property can be provided to set this attribute on iOS platforms. (IOS only): The options.NSURLIsExcludedFromBackupKey property can be provided to set this attribute on iOS platforms. Apple will reject apps for storing offline cache data that does not have this attribute.

downloadFile(options: DownloadFileOptions, completeCallback?: DownloadResultFunc, errorCallback?: DownloadErrorFunc): DownloadResult | Promise<DownloadResult>

Download file from options.fromUrl to options.toFile. Will overwrite any previously existing file.

1type DownloadFileOptions = {
2  fromUrl: string; // URL to download file from
3  toFile: string; // Local filesystem path to save the file to
4  headers?: { [key: string]: string | number }; // An object of headers to be passed to the server
5  background?: boolean; // Continue the download in the background after the app terminates (iOS only)
6  discretionary?: boolean; // Allow the OS to control the timing and speed of the download to improve perceived performance  (iOS only)
7  cacheable?: boolean; // Whether the download can be stored in the shared NSURLCache (iOS only, defaults to true)
8  progressInterval?: number;
9  progressDivider?: number;
10  begin?: (res: DownloadBeginCallbackResult) => void; // Note: it is required when progress prop provided
11  progress?: (res: DownloadProgressCallbackResult) => void;
12  resumable?: () => void; // only supported on iOS yet
13  connectionTimeout?: number; // only supported on Android yet
14  readTimeout?: number; // supported on Android and iOS
15  backgroundTimeout?: number; // Maximum time (in milliseconds) to download an entire resource (iOS only, useful for timing out background downloads)
16};

If options.begin is provided, it will be invoked once upon download starting when headers have been received and passed a single argument with the following properties:

1type DownloadBeginCallbackResult = {
2  jobId: number; // The download job ID, required if one wishes to cancel the download. See `stopDownload`.
3  statusCode: number; // The HTTP status code
4  contentLength: number; // The total size in bytes of the download resource
5  headers: { [key: string]: string | number }; // The HTTP response headers from the server
6};

If options.progress is provided, it will be invoked continuously and passed a single argument with the following properties:

1type DownloadProgressCallbackResult = {
2  jobId: number; // The download job ID, required if one wishes to cancel the download. See `stopDownload`.
3  contentLength: number; // The total size in bytes of the download resource
4  bytesWritten: number; // The number of bytes written to the file so far
5};

If options.progressInterval is provided, it will return progress events in the maximum frequency of progressDivider. For example, if progressInterval = 100, you will not receive callbacks more often than every 100th millisecond.

If options.progressDivider is provided, it will return progress events that divided by progressDivider.

For example, if progressDivider = 10, you will receive only ten callbacks for this values of progress: 0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100 Use it for performance issues. If progressDivider = 0, you will receive all progressCallback calls, default value is 0.

(IOS only): options.background (Boolean) - Whether to continue downloads when the app is not focused (default: false) This option is currently only available for iOS, see the Background Downloads Tutorial (iOS) section.

(IOS only): If options.resumable is provided, it will be invoked when the download has stopped and and can be resumed using resumeDownload().

If completeCallback is provided, function will not return promise and completeCallback will be invoked after the download is complete and passed a single argument with the following properties:

1type DownloadResult = {
2  jobId: number; // The download job ID, required if one wishes to cancel the download. See `stopDownload`.
3  statusCode?: number; // The HTTP status code
4  bytesWritten?: number; // The number of bytes written to the file
5};

If errorCallback is provided with completeCallback function it will be invoked in case of downloading error and passed a single argument with the following properties:

1type DownloadError = {
2  jobId: number;
3  errorMessage: string;
4};

stopDownload(jobId: number): void

Abort the current download job with this ID. The partial file will remain on the filesystem.

(iOS only) resumeDownload(jobId: number): void

Resume the current download job with this ID.

(iOS only) isResumable(jobId: number): boolean

Check if the the download job with this ID is resumable with resumeDownload().

Example:

1if (RNFS.isResumable(jobId)) {
2    RNFS.resumeDownload(jobId)
3}

(iOS only) completeHandlerIOS(jobId: number): void

For use when using background downloads, tell iOS you are done handling a completed download.

Read more about background downloads in the Background Downloads Tutorial (iOS) section.

uploadFiles(options: UploadFileOptions, completeCallback?: UploadResultFunc, errorCallback?: UploadErrorFunc): UploadResult

(iOS only) stopUpload(jobId: number): void

Abort the current upload job with this ID.

getFSInfo(): FSInfoResult

Returns an object with the following properties:

1type FSInfoResult = {
2  totalSpace: number; // The total amount of storage space on the device (in bytes).
3  freeSpace: number; // The amount of available storage space on the device (in bytes).
4  totalSpaceEx?: number; // The amount of available external storage space on the device (in bytes) (android only)
5  freeSpaceEx?: number; // The amount of available external storage space on the device (in bytes) (android only)
6};

(Android only) scanFile(path: string, completeCallback?: ScanResultFunc): ScanResult

Scan the file using Media Scanner.

(Android only) getAllExternalFilesDirs(): string[]

Returns an array with the absolute paths to application-specific directories on all shared/external storage devices where the application can place persistent files it owns.

(iOS only) pathForGroup(groupIdentifier: string): string

groupIdentifier (string) Any value from the com.apple.security.application-groups entitlements list.

Returns the absolute path to the directory shared for all applications with the same security group identifier. This directory can be used to to share files between application of the same developer.

Invalid group identifier will cause a rejection.

For more information read the Adding an App to an App Group section.

Background Downloads Tutorial (iOS)

Background downloads in iOS require a bit of a setup.

First, in your AppDelegate.m file add the following:

1#import <RNFSManager.h>
2
3...
4
5- (void)application:(UIApplication *)application handleEventsForBackgroundURLSession:(NSString *)identifier completionHandler:(void (^)())completionHandler
6{
7  [RNFSManager setCompletionHandlerForIdentifier:identifier completionHandler:completionHandler];
8}
9

The handleEventsForBackgroundURLSession method is called when a background download is done and your app is not in the foreground.

We need to pass the completionHandler to RNFS along with its identifier.

The JavaScript will continue to work as usual when the download is done but now you must call RNFS.completeHandlerIOS(jobId) when you're done handling the download (show a notification etc.)

BE AWARE! iOS will give about 30 sec. to run your code after handleEventsForBackgroundURLSession is called and until completionHandler is triggered so don't do anything that might take a long time (like unzipping), you will be able to do it after the user re-launces the app, otherwide iOS will terminate your app.

Thanks

Thanks to @mrousavy for valuable examples of working with C++ Turbo Modules

License

MIT