@rn-common/file

This module provides a set of utility functions for working with the file system in React Native, using Expo's FileSystem API. It includes functions for creating directories, reading and writing files, deleting files and folders, and managing downloads.

Installation

Install using:

npx expo install @rn-common/file expo-file-system

Exports

Directories

• DocumentDirectory: The document directory path.
• CacheDirectory: The cache directory path.

Functions

mkdir(dir: string)

Creates a new directory at the specified path, including any necessary intermediate directories.

Parameters:

• dir (string): The path of the directory to create.

Returns:

• Promise<void>: Resolves when the directory is created.

Example:

await mkdir('/path/to/new/directory')

readFile(filePath: string, options?: FileSystem.ReadingOptions)

Reads the contents of a file as a string.

Parameters:

• filePath (string): The path of the file to read.
• options (FileSystem.ReadingOptions): Optional settings for reading the file.

Returns:

• Promise<string>: The contents of the file.

Example:

const contents = await readFile('/path/to/file.txt')

writeFile(filePath: string, contents: string, options?: FileSystem.WritingOptions)

Writes content to a file.

Parameters:

• filePath (string): The path of the file to write to.
• contents (string): The content to write.
• options (FileSystem.WritingOptions): Optional settings for writing the file.

Returns:

• Promise<void>: Resolves when the file is written.

Example:

await writeFile('/path/to/file.txt', 'Hello, World!')

removeFile(filePath: string)

Deletes a file at the specified path.

Parameters:

• filePath (string): The path of the file to delete.

Returns:

• Promise<void>: Resolves when the file is deleted.

Example:

await removeFile('/path/to/file.txt')

removeFolder(folderPath: string)

Deletes a folder and all its contents.

Parameters:

• folderPath (string): The path of the folder to delete.

Returns:

• Promise<void>: Resolves when the folder and its contents are deleted.

Example:

await removeFolder('/path/to/folder')

extractFilename(filePath: string, withExtension = true)

Extracts the filename from a given file path.

Parameters:

• filePath (string): The file path.
• withExtension (boolean, default: true): Whether to include the file extension.

Returns:

• string: The extracted filename.

Example:

const filename = extractFilename('/path/to/file.txt') // 'file.txt'
const nameWithoutExtension = extractFilename('/path/to/file.txt', false) // 'file'

extractExtension(filePath: string)

Extracts the file extension from a given file path.

Parameters:

• filePath (string): The file path.

Returns:

• string: The file extension.

Example:

const extension = extractExtension('/path/to/file.txt') // 'txt'

joinPath(...paths: string[])

Joins multiple path segments into a single path.

Parameters:

• ...paths (string[]): Path segments.

Returns:

• string: The combined path.

Example:

const fullPath = joinPath('/path', 'to', 'file.txt') // '/path/to/file.txt'

createDownloadFile({ uri, filePath, options, onProgress })

Initiates a file download from a specified URI.

Parameters:

• uri (string): The URI of the file to download.
• filePath (string): The local path to save the downloaded file.
• options (FileSystem.DownloadOptions): Optional download settings.
• onProgress (function): Callback for download progress.

Returns:

• Object: Methods to control the download (download, pause, resume, cancel) and the uri of the downloaded file.

Example:

const { download, pause, resume, cancel, uri } = createDownloadFile({
  uri: 'https://example.com/file.zip',
  filePath: '/path/to/file.zip',
  onProgress: (progress) => console.log(`Download progress: ${progress}%`),
})
await download()