@socketsupply/socket
v0.6.0-rc.8
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A Cross-Platform, Native Runtime for Desktop and Mobile Apps — Create apps using HTML, CSS, and JavaScript. Written from the ground up to be small and maintainable.
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Buffer
Buffer module is a third party vendor module provided by Feross Aboukhadijeh and other contributors (MIT License).
External docs: https://nodejs.org/api/buffer.html
Events
Events module is a third party module provided by Browserify and Node.js contributors (MIT License).
External docs: https://nodejs.org/api/events.html
application
Provides Application level methods
Example usage:
import { createWindow } from 'socket:application'
MAX_WINDOWS
This is a VariableDeclaration
named MAX_WINDOWS
in api/application.js
, it's exported but undocumented.
ApplicationWindowList
This is a ClassDeclaration
named ApplicationWindowList
in api/application.js
, it's exported but undocumented.
addEventListener(type, listener, |boolean)
Add an application event type
callback listener
with options
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | type | string | | false | | | listener | function(Event | MessageEvent | CustomEvent | ApplicationURLEvent): boolean | | false | | | |boolean | { once?: boolean | } options | false | |
removeEventListener(type, listener)
Remove an application event type
callback listener
with options
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | type | string | | false | | | listener | function(Event | MessageEvent | CustomEvent | ApplicationURLEvent): boolean | | false | |
getCurrentWindowIndex()
Returns the current window index
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | number | |
createWindow(opts)
Creates a new window and returns an instance of ApplicationWindow.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | opts | object | | false | an options object | | opts.aspectRatio | string | | true | a string (split on ':') provides two float values which set the window's aspect ratio. | | opts.closable | boolean | | true | deterime if the window can be closed. | | opts.minimizable | boolean | | true | deterime if the window can be minimized. | | opts.maximizable | boolean | | true | deterime if the window can be maximized. | | opts.margin | number | | true | a margin around the webview. (Private) | | opts.radius | number | | true | a radius on the webview. (Private) | | opts.index | number | | false | the index of the window. | | opts.path | string | | false | the path to the HTML file to load into the window. | | opts.title | string | | true | the title of the window. | | opts.titlebarStyle | string | | true | determines the style of the titlebar (MacOS only). | | opts.windowControlOffsets | string | | true | a string (split on 'x') provides the x and y position of the traffic lights (MacOS only). | | opts.backgroundColorDark | string | | true | determines the background color of the window in dark mode. | | opts.backgroundColorLight | string | | true | determines the background color of the window in light mode. | | opts.width | number | string | | true | the width of the window. If undefined, the window will have the main window width. | | opts.height | number | string | | true | the height of the window. If undefined, the window will have the main window height. | | opts.minWidth | number | string | 0 | true | the minimum width of the window | | opts.minHeight | number | string | 0 | true | the minimum height of the window | | opts.maxWidth | number | string | 100% | true | the maximum width of the window | | opts.maxHeight | number | string | 100% | true | the maximum height of the window | | opts.resizable | boolean | true | true | whether the window is resizable | | opts.frameless | boolean | false | true | whether the window is frameless | | opts.utility | boolean | false | true | whether the window is utility (macOS only) | | opts.shouldExitApplicationOnClose | boolean | false | true | whether the window can exit the app | | opts.headless | boolean | false | true | whether the window will be headless or not (no frame) | | opts.userScript | string | null | true | A user script that will be injected into the window (desktop only) | | opts.protocolHandlers | string | | true | An array of protocol handler schemes to register with the new window (requires service worker) |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
radius()
margin()
getScreenSize()
Returns the current screen size.
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<{ width: number, height: number | >} |
getWindows(indices)
Returns the ApplicationWindow instances for the given indices or all windows if no indices are provided.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | indices | number | | true | the indices of the windows |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
getWindow(index)
Returns the ApplicationWindow instance for the given index
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | index | number | | false | the index of the window |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | the ApplicationWindow instance or null if the window does not exist |
getCurrentWindow()
Returns the ApplicationWindow instance for the current window.
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
exit(code)
Quits the backend process and then quits the render process, the exit code used is the final exit code to the OS.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | code | number | 0 | true | an exit code |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
setSystemMenu(options)
Set the native menu for the app.
Socket Runtime provides a minimalist DSL that makes it easy to create cross platform native system and context menus.
Menus are created at run time. They can be created from either the Main or
Render process. The can be recreated instantly by calling the setSystemMenu
method.
The method takes a string. Here's an example of a menu. The semi colon is significant indicates the end of the menu. Use an underscore when there is no accelerator key. Modifiers are optional. And well known OS menu options like the edit menu will automatically get accelerators you dont need to specify them.
socket.application.setSystemMenu({ index: 0, value: `
App:
Foo: f;
Edit:
Cut: x
Copy: c
Paste: v
Delete: _
Select All: a;
Other:
Apple: _
Another Test: T
!Im Disabled: I
Some Thing: S + Meta
---
Bazz: s + Meta, Control, Alt;
`)
Separators
To create a separator, use three dashes ---
.
Accelerator Modifiers
Accelerator modifiers are used as visual indicators but don't have a material impact as the actual key binding is done in the event listener.
A capital letter implies that the accelerator is modified by the Shift
key.
Additional accelerators are Meta
, Control
, Option
, each separated
by commas. If one is not applicable for a platform, it will just be ignored.
On MacOS Meta
is the same as Command
.
Disabled Items
If you want to disable a menu item just prefix the item with the !
character.
This will cause the item to appear disabled when the system menu renders.
Submenus
We feel like nested menus are an anti-pattern. We don't use them. If you have a strong argument for them and a very simple pull request that makes them work we may consider them.
Event Handling
When a menu item is activated, it raises the menuItemSelected
event in
the front end code, you can then communicate with your backend code if you
want from there.
For example, if the Apple
item is selected from the Other
menu...
window.addEventListener('menuItemSelected', event => {
assert(event.detail.parent === 'Other')
assert(event.detail.title === 'Apple')
})
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | options | object | | false | an options object | | options.value | string | | false | the menu layout | | options.index | number | | false | the window to target (if applicable) |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
setTrayMenu()
An alias to setSystemMenu for creating a tary menu
setSystemMenuItemEnabled(value)
Set the enabled state of the system menu.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | value | object | | false | an options object |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
isPaused()
Predicate function to determine if application is in a "paused" state.
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | boolean | |
runtimeVersion
Socket Runtime version.
debug
Runtime debug flag.
config
Application configuration.
backend
The application's backend instance.
open(opts)
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | opts | object | | false | an options object | | opts.force | boolean | false | true | whether to force the existing process to close |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
close()
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
bluetooth
A high-level, cross-platform API for Bluetooth Pub-Sub
Example usage:
import { Bluetooth } from 'socket:bluetooth'
Bluetooth
(extends EventEmitter
)
Create an instance of a Bluetooth service.
constructor(serviceId)
constructor is an example property that is set to true
Creates a new service with key-value pairs
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | serviceId | string | | false | Given a default value to determine the type |
start()
Start the Bluetooth service.
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
subscribe(id)
Start scanning for published values that correspond to a well-known UUID. Once subscribed to a UUID, events that correspond to that UUID will be emitted. To receive these events you can add an event listener, for example...
const ble = new Bluetooth(id)
ble.subscribe(uuid)
ble.on(uuid, (data, details) => {
// ...do something interesting
})
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | id | string | | true | A well-known UUID |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise<ipc.Result> | |
publish(id, value)
Start advertising a new value for a well-known UUID
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | id | string | | true | A well-known UUID | | value | string | | true | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
crypto
Some high-level methods around the crypto.subtle
API for getting
random bytes and hashing.
Example usage:
import { randomBytes } from 'socket:crypto'
webcrypto
External docs: https://developer.mozilla.org/en-US/docs/Web/API/Crypto WebCrypto API
ready
A promise that resolves when all internals to be loaded/ready.
getRandomValues(buffer)
External docs: https://developer.mozilla.org/en-US/docs/Web/API/Crypto/getRandomValues
Generate cryptographically strong random values into the buffer
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | buffer | TypedArray | | false | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | TypedArray | |
rand64()
Generate a random 64-bit number.
| Return Value | Type | Description | | :--- | :--- | :--- | | A random 64-bit number. | BigInt | |
RANDOM_BYTES_QUOTA
Maximum total size of random bytes per page
MAX_RANDOM_BYTES
Maximum total size for random bytes.
MAX_RANDOM_BYTES_PAGES
Maximum total amount of allocated per page of bytes (max/quota)
randomBytes(size)
Generate size
random bytes.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | size | number | | false | The number of bytes to generate. The size must not be larger than 2**31 - 1. |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Buffer | A promise that resolves with an instance of socket.Buffer with random bytes. |
createDigest(algorithm, message)
| Argument | Type | Default | Optional | Description |
| :--- | :--- | :---: | :---: | :--- |
| algorithm | string | | false | SHA-1
| SHA-256
| SHA-384
| SHA-512
|
| message | Buffer | TypedArray | DataView | | false | An instance of socket.Buffer, TypedArray or Dataview. |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | A promise that resolves with an instance of socket.Buffer with the hash. |
murmur3(value, seed)
A murmur3 hash implementation based on https://github.com/jwerle/murmurhash.c
that works on strings and ArrayBuffer
views (typed arrays)
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | value | string | Uint8Array | ArrayBuffer | | false | | | seed | number | 0 | true | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | number | |
dgram
This module provides an implementation of UDP datagram sockets. It does not (yet) provide any of the multicast methods or properties.
Example usage:
import { createSocket } from 'socket:dgram'
createSocket(options, callback)
Creates a Socket
instance.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | options | string | Object | | false | either a string ('udp4' or 'udp6') or an options object | | options.type | string | | true | The family of socket. Must be either 'udp4' or 'udp6'. Required. | | options.reuseAddr | boolean | false | true | When true socket.bind() will reuse the address, even if another process has already bound a socket on it. Default: false. | | options.ipv6Only | boolean | false | true | Default: false. | | options.recvBufferSize | number | | true | Sets the SO_RCVBUF socket value. | | options.sendBufferSize | number | | true | Sets the SO_SNDBUF socket value. | | options.signal | AbortSignal | | true | An AbortSignal that may be used to close a socket. | | callback | function | | true | Attached as a listener for 'message' events. Optional. |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Socket | |
Socket
(extends EventEmitter
)
New instances of dgram.Socket are created using dgram.createSocket(). The new keyword is not to be used to create dgram.Socket instances.
bind(port, address, callback)
External docs: https://nodejs.org/api/dgram.html#socketbindport-address-callback Listen for datagram messages on a named port and optional address If the address is not specified, the operating system will attempt to listen on all addresses. Once the binding is complete, a 'listening' event is emitted and the optional callback function is called.
If binding fails, an 'error' event is emitted.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | port | number | | false | The port to listen for messages on | | address | string | | false | The address to bind to (0.0.0.0) | | callback | function | | false | With no parameters. Called when binding is complete. |
connect(port, host, connectListener)
External docs: https://nodejs.org/api/dgram.html#socketconnectport-address-callback Associates the dgram.Socket to a remote address and port. Every message sent by this handle is automatically sent to that destination. Also, the socket will only receive messages from that remote peer. Trying to call connect() on an already connected socket will result in an ERR_SOCKET_DGRAM_IS_CONNECTED exception. If the address is not provided, '0.0.0.0' (for udp4 sockets) or '::1' (for udp6 sockets) will be used by default. Once the connection is complete, a 'connect' event is emitted and the optional callback function is called. In case of failure, the callback is called or, failing this, an 'error' event is emitted.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | port | number | | false | Port the client should connect to. | | host | string | | true | Host the client should connect to. | | connectListener | function | | true | Common parameter of socket.connect() methods. Will be added as a listener for the 'connect' event once. |
disconnect()
External docs: https://nodejs.org/api/dgram.html#socketdisconnect A synchronous function that disassociates a connected dgram.Socket from its remote address. Trying to call disconnect() on an unbound or already disconnected socket will result in an ERR_SOCKET_DGRAM_NOT_CONNECTED exception.
send(msg, offset, length, port, address, callback)
External docs: https://nodejs.org/api/dgram.html#socketsendmsg-offset-length-port-address-callback Broadcasts a datagram on the socket. For connectionless sockets, the destination port and address must be specified. Connected sockets, on the other hand, will use their associated remote endpoint, so the port and address arguments must not be set.
The msg argument contains the message to be sent. Depending on its type, different behavior can apply. If msg is a Buffer, any TypedArray, or a DataView, the offset and length specify the offset within the Buffer where the message begins and the number of bytes in the message, respectively. If msg is a String, then it is automatically converted to a Buffer with 'utf8' encoding. With messages that contain multi-byte characters, offset, and length will be calculated with respect to byte length and not the character position. If msg is an array, offset and length must not be specified.
The address argument is a string. If the value of the address is a hostname, DNS will be used to resolve the address of the host. If the address is not provided or otherwise nullish, '0.0.0.0' (for udp4 sockets) or '::1' (for udp6 sockets) will be used by default.
If the socket has not been previously bound with a call to bind, the socket is assigned a random port number and is bound to the "all interfaces" address ('0.0.0.0' for udp4 sockets, '::1' for udp6 sockets.)
An optional callback function may be specified as a way of reporting DNS errors or for determining when it is safe to reuse the buf object. DNS lookups delay the time to send for at least one tick of the Node.js event loop.
The only way to know for sure that the datagram has been sent is by using a callback. If an error occurs and a callback is given, the error will be passed as the first argument to the callback. If a callback is not given, the error is emitted as an 'error' event on the socket object.
Offset and length are optional but both must be set if either is used. They are supported only when the first argument is a Buffer, a TypedArray, or a DataView.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | msg | Buffer | TypedArray | DataView | string | Array | | false | Message to be sent. | | offset | integer | | true | Offset in the buffer where the message starts. | | length | integer | | true | Number of bytes in the message. | | port | integer | | true | Destination port. | | address | string | | true | Destination host name or IP address. | | callback | Function | | true | Called when the message has been sent. |
close(callback)
External docs: https://nodejs.org/api/dgram.html#socketclosecallback Close the underlying socket and stop listening for data on it. If a callback is provided, it is added as a listener for the 'close' event.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | callback | function | | true | Called when the connection is completed or on error. |
address()
External docs: https://nodejs.org/api/dgram.html#socketaddress Returns an object containing the address information for a socket. For UDP sockets, this object will contain address, family, and port properties.
This method throws EBADF if called on an unbound socket.
| Return Value | Type | Description | | :--- | :--- | :--- | | socketInfo | Object | Information about the local socket | | socketInfo.address | string | The IP address of the socket | | socketInfo.port | string | The port of the socket | | socketInfo.family | string | The IP family of the socket |
remoteAddress()
External docs: https://nodejs.org/api/dgram.html#socketremoteaddress Returns an object containing the address, family, and port of the remote endpoint. This method throws an ERR_SOCKET_DGRAM_NOT_CONNECTED exception if the socket is not connected.
| Return Value | Type | Description | | :--- | :--- | :--- | | socketInfo | Object | Information about the remote socket | | socketInfo.address | string | The IP address of the socket | | socketInfo.port | string | The port of the socket | | socketInfo.family | string | The IP family of the socket |
setRecvBufferSize(size)
External docs: https://nodejs.org/api/dgram.html#socketsetrecvbuffersizesize Sets the SO_RCVBUF socket option. Sets the maximum socket receive buffer in bytes.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | size | number | | false | The size of the new receive buffer |
setSendBufferSize(size)
External docs: https://nodejs.org/api/dgram.html#socketsetsendbuffersizesize Sets the SO_SNDBUF socket option. Sets the maximum socket send buffer in bytes.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | size | number | | false | The size of the new send buffer |
getRecvBufferSize()
External docs: https://nodejs.org/api/dgram.html#socketgetrecvbuffersize
getSendBufferSize()
External docs: https://nodejs.org/api/dgram.html#socketgetsendbuffersize
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | number | the SO_SNDBUF socket send buffer size in bytes. |
code()
ERR_SOCKET_ALREADY_BOUND
(extends SocketError
)
Thrown when a socket is already bound.
ERR_SOCKET_DGRAM_IS_CONNECTED
(extends SocketError
)
Thrown when the socket is already connected.
ERR_SOCKET_DGRAM_NOT_CONNECTED
(extends SocketError
)
Thrown when the socket is not connected.
ERR_SOCKET_DGRAM_NOT_RUNNING
(extends SocketError
)
Thrown when the socket is not running (not bound or connected).
ERR_SOCKET_BAD_TYPE
(extends TypeError
)
Thrown when a bad socket type is used in an argument.
ERR_SOCKET_BAD_PORT
(extends RangeError
)
Thrown when a bad port is given.
dns
This module enables name resolution. For example, use it to look up IP addresses of host names. Although named for the Domain Name System (DNS), it does not always use the DNS protocol for lookups. dns.lookup() uses the operating system facilities to perform name resolution. It may not need to perform any network communication. To perform name resolution the way other applications on the same system do, use dns.lookup().
Example usage:
import { lookup } from 'socket:dns'
lookup(hostname, options, cb)
External docs: https://nodejs.org/api/dns.html#dns_dns_lookup_hostname_options_callback
Resolves a host name (e.g. example.org
) into the first found A (IPv4) or
AAAA (IPv6) record. All option properties are optional. If options is an
integer, then it must be 4 or 6 – if options is 0 or not provided, then IPv4
and IPv6 addresses are both returned if found.
From the node.js website...
With the all option set to true, the arguments for callback change to (err, addresses), with addresses being an array of objects with the properties address and family.
On error, err is an Error object, where err.code is the error code. Keep in mind that err.code will be set to 'ENOTFOUND' not only when the host name does not exist but also when the lookup fails in other ways such as no available file descriptors. dns.lookup() does not necessarily have anything to do with the DNS protocol. The implementation uses an operating system facility that can associate names with addresses and vice versa. This implementation can have subtle but important consequences on the behavior of any Node.js program. Please take some time to consult the Implementation considerations section before using dns.lookup().
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | hostname | string | | false | The host name to resolve. | | options | object | intenumberger | | true | An options object or record family. | | options.family | number | string | 0 | true | The record family. Must be 4, 6, or 0. For backward compatibility reasons,'IPv4' and 'IPv6' are interpreted as 4 and 6 respectively. The value 0 indicates that IPv4 and IPv6 addresses are both returned. Default: 0. | | cb | function | | false | The function to call after the method is complete. |
dns.promises
This module enables name resolution. For example, use it to look up IP addresses of host names. Although named for the Domain Name System (DNS), it does not always use the DNS protocol for lookups. dns.lookup() uses the operating system facilities to perform name resolution. It may not need to perform any network communication. To perform name resolution the way other applications on the same system do, use dns.lookup().
Example usage:
import { lookup } from 'socket:dns/promises'
lookup(hostname, opts)
External docs: https://nodejs.org/api/dns.html#dnspromiseslookuphostname-options
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | hostname | string | | false | The host name to resolve. | | opts | Object | | true | An options object. | | opts.family | number | string | 0 | true | The record family. Must be 4, 6, or 0. For backward compatibility reasons,'IPv4' and 'IPv6' are interpreted as 4 and 6 respectively. The value 0 indicates that IPv4 and IPv6 addresses are both returned. Default: 0. |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
fs
This module enables interacting with the file system in a way modeled on standard POSIX functions.
The Application Sandbox restricts access to the file system.
iOS Application Sandboxing has a set of rules that limits access to the file system. Apps can only access files in their own sandboxed home directory.
| Directory | Description |
| --- | --- |
| Documents
| The app’s sandboxed documents directory. The contents of this directory are backed up by iTunes and may be set as accessible to the user via iTunes when UIFileSharingEnabled
is set to true
in the application's info.plist
. |
| Library
| The app’s sandboxed library directory. The contents of this directory are synchronized via iTunes (except the Library/Caches
subdirectory, see below), but never exposed to the user. |
| Library/Caches
| The app’s sandboxed caches directory. The contents of this directory are not synchronized via iTunes and may be deleted by the system at any time. It's a good place to store data which provides a good offline-first experience for the user. |
| Library/Preferences
| The app’s sandboxed preferences directory. The contents of this directory are synchronized via iTunes. Its purpose is to be used by the Settings app. Avoid creating your own files in this directory. |
| tmp
| The app’s sandboxed temporary directory. The contents of this directory are not synchronized via iTunes and may be deleted by the system at any time. Although, it's recommended that you delete data that is not necessary anymore manually to minimize the space your app takes up on the file system. Use this directory to store data that is only useful during the app runtime. |
Example usage:
import * as fs from 'socket:fs';
access(path, mode, callback)
External docs: https://nodejs.org/api/fs.html#fsopenpath-flags-mode-callback
Asynchronously check access a file for a given mode calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | mode | string? | function(Error?)? | F_OK(0) | true | | | callback | function(Error?)? | | true | |
accessSync(path, mode)
External docs: https://nodejs.org/api/fs.html#fsopenpath-flags-mode-callback
Synchronously check access a file for a given mode calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | mode | string? | F_OK(0) | true | |
exists(path, callback)
Checks if a path exists
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | callback | function(Boolean)? | | true | |
existsSync(path, callback)
Checks if a path exists
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | callback | function(Boolean)? | | true | |
chmod(path, mode, callback)
External docs: https://nodejs.org/api/fs.html#fschmodpath-mode-callback Asynchronously changes the permissions of a file. No arguments other than a possible exception are given to the completion callback
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | mode | number | | false | | | callback | function(Error?) | | false | |
chmodSync(path, mode)
External docs: https://nodejs.org/api/fs.html#fschmodpath-mode-callback Synchronously changes the permissions of a file.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | mode | number | | false | |
chown(path, uid, gid, callback)
Changes ownership of file or directory at path
with uid
and gid
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | uid | number | | false | | | gid | number | | false | | | callback | function | | false | |
chownSync(path, uid, gid)
Changes ownership of file or directory at path
with uid
and gid
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | uid | number | | false | | | gid | number | | false | |
close(fd, callback)
External docs: https://nodejs.org/api/fs.html#fsclosefd-callback
Asynchronously close a file descriptor calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | | | callback | function(Error?)? | | true | |
closeSync(fd)
Synchronously close a file descriptor.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | fd |
copyFile(src, dest, flags, callback)
External docs: https://nodejs.org/api/fs.html#fscopyfilesrc-dest-mode-callback
Asynchronously copies src
to dest
calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | The source file path. | | dest | string | | false | The destination file path. | | flags | number | | false | Modifiers for copy operation. | | callback | function(Error=) | | true | The function to call after completion. |
copyFileSync(src, dest, flags)
External docs: https://nodejs.org/api/fs.html#fscopyfilesrc-dest-mode-callback
Synchronously copies src
to dest
calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | The source file path. | | dest | string | | false | The destination file path. | | flags | number | | false | Modifiers for copy operation. |
createReadStream(path, options)
External docs: https://nodejs.org/api/fs.html#fscreatewritestreampath-options
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | | true | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | ReadStream | |
createWriteStream(path, options)
External docs: https://nodejs.org/api/fs.html#fscreatewritestreampath-options
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | | true | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | WriteStream | |
fstat(fd, options, callback)
External docs: https://nodejs.org/api/fs.html#fsfstatfd-options-callback Invokes the callback with the <fs.Stats> for the file descriptor. See the POSIX fstat(2) documentation for more detail.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | A file descriptor. | | options | object? | function? | | true | An options object. | | callback | function? | | false | The function to call after completion. |
fsync(fd, callback)
Request that all data for the open file descriptor is flushed to the storage device.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | A file descriptor. | | callback | function | | false | The function to call after completion. |
ftruncate(fd, offset, callback)
Truncates the file up to offset
bytes.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | A file descriptor. | | offset | number= | function | 0 | true | | | callback | function? | | false | The function to call after completion. |
lchown(path, uid, gid, callback)
Chages ownership of link at path
with uid
and `gid.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | uid | number | | false | | | gid | number | | false | | | callback | function | | false | |
link(src, dest, )
Creates a link to dest
from src
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | | | dest | string | | false | | | (Position 0) | function | | false | |
open(path, flags, mode, options, callback)
External docs: https://nodejs.org/api/fs.html#fsopenpath-flags-mode-callback
Asynchronously open a file calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | flags | string? | r | true | | | mode | string? | 0o666 | true | | | options | object? | function? | | true | | | callback | function(Error?, number?)? | | true | |
openSync(path, flags, mode, options)
Synchronously open a file.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | flags | string? | r | true | | | mode | string? | 0o666 | true | | | options | object? | function? | | true | |
opendir(path, options, callback)
External docs: https://nodejs.org/api/fs.html#fsreaddirpath-options-callback
Asynchronously open a directory calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | function(Error?, Dir?) | | true | | | options.encoding | string? | utf8 | true | | | options.withFileTypes | boolean? | false | true | | | callback | function(Error?, Dir?)? | | false | |
opendirSync(path, options)
External docs: https://nodejs.org/api/fs.html#fsreaddirpath-options-callback Synchronously open a directory.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | function(Error?, Dir?) | | true | | | options.encoding | string? | utf8 | true | | | options.withFileTypes | boolean? | false | true | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Dir | |
read(fd, buffer, offset, length, position, callback)
External docs: https://nodejs.org/api/fs.html#fsreadfd-buffer-offset-length-position-callback Asynchronously read from an open file descriptor.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | | | buffer | object | Buffer | TypedArray | | false | The buffer that the data will be written to. | | offset | number | | false | The position in buffer to write the data to. | | length | number | | false | The number of bytes to read. | | position | number | BigInt | null | | false | Specifies where to begin reading from in the file. If position is null or -1 , data will be read from the current file position, and the file position will be updated. If position is an integer, the file position will be unchanged. | | callback | function(Error?, number?, Buffer?) | | false | |
write(fd, buffer, offset, length, position, callback)
External docs: https://nodejs.org/api/fs.html#fswritefd-buffer-offset-length-position-callback Asynchronously write to an open file descriptor.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | fd | number | | false | | | buffer | object | Buffer | TypedArray | | false | The buffer that the data will be written to. | | offset | number | | false | The position in buffer to write the data to. | | length | number | | false | The number of bytes to read. | | position | number | BigInt | null | | false | Specifies where to begin reading from in the file. If position is null or -1 , data will be read from the current file position, and the file position will be updated. If position is an integer, the file position will be unchanged. | | callback | function(Error?, number?, Buffer?) | | false | |
readdir(path, options, callback)
External docs: https://nodejs.org/api/fs.html#fsreaddirpath-options-callback Asynchronously read all entries in a directory.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | function(Error?, object) | | true | | | options.encoding ? utf8 | string? | | true | | | options.withFileTypes ? false | boolean? | | true | | | callback | function(Error?, object) | | false | |
readdirSync(path, options)
External docs: https://nodejs.org/api/fs.html#fsreaddirpath-options-callback Synchronously read all entries in a directory.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | function(Error?, object) | | true | | | options.encoding ? utf8 | string? | | true | | | options.withFileTypes ? false | boolean? | | true | |
readFile(path, options, callback)
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | | | options | object? | function(Error?, Buffer?) | | true | | | options.encoding ? utf8 | string? | | true | | | options.flag ? r | string? | | true | | | options.signal | AbortSignal? | | true | | | callback | function(Error?, Buffer?) | | false | |
readFileSync(path, } options, options)
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | | | } options | { encoding?: string = 'utf8', flags?: string = 'r' | | false | | | options | object? | function(Error?, Buffer?) | | true | | | options.signal | AbortSignal? | | true | |
readlink(path, callback)
Reads link at path
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | callback | function(err, string) | | false | |
realpath(path, callback)
Computes real path for path
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | callback | function(err, string) | | false | |
realpathSync(path)
Computes real path for path
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | |
rename(src, dest, callback)
Renames file or directory at src
to dest
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | | | dest | string | | false | | | callback | function | | false | |
renameSync(src, dest)
Renames file or directory at src
to dest
, synchronously.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | | | dest | string | | false | |
rmdir(path, callback)
Removes directory at path
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | callback | function | | false | |
rmdirSync(path)
Removes directory at path
, synchronously.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | |
statSync(path, options)
Synchronously get the stats of a file
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | filename or file descriptor | | options | object? | | false | | | options.encoding ? utf8 | string? | | true | | | options.flag ? r | string? | | true | |
stat(path, options, callback)
Get the stats of a file
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | filename or file descriptor | | options | object? | | false | | | options.encoding ? utf8 | string? | | true | | | options.flag ? r | string? | | true | | | options.signal | AbortSignal? | | true | | | callback | function(Error?, Stats?) | | false | |
lstat(path, options, callback)
Get the stats of a symbolic link
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | filename or file descriptor | | options | object? | | false | | | options.encoding ? utf8 | string? | | true | | | options.flag ? r | string? | | true | | | options.signal | AbortSignal? | | true | | | callback | function(Error?, Stats?) | | false | |
symlink(src, dest)
Creates a symlink of src
at dest
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | | | dest | string | | false | |
unlink(path, callback)
Unlinks (removes) file at path
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | callback | function | | false | |
unlinkSync(path)
Unlinks (removes) file at path
, synchronously.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | |
writeFile(path, data, options, callback)
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | filename or file descriptor | | data | string | Buffer | TypedArray | DataView | object | | false | | | options | object? | | false | | | options.encoding ? utf8 | string? | | true | | | options.mode ? 0o666 | string? | | true | | | options.flag ? w | string? | | true | | | options.signal | AbortSignal? | | true | | | callback | function(Error?) | | false | |
writeFileSync(path, data, options)
External docs: https://nodejs.org/api/fs.html#fswritefilesyncfile-data-options Writes data to a file synchronously.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | number | | false | filename or file descriptor | | data | string | Buffer | TypedArray | DataView | object | | false | | | options | object? | | false | | | options.encoding ? utf8 | string? | | true | | | options.mode ? 0o666 | string? | | true | | | options.flag ? w | string? | | true | | | options.signal | AbortSignal? | | true | |
watch(, options, callback)
Watch for changes at path
calling callback
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | (Position 0) | string | | false | | | options | function | object | | true | | | options.encoding | string | utf8 | true | | | callback | ?function | | true | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Watcher | |
fs.promises
- This module enables interacting with the file system in a way modeled on standard POSIX functions.
The Application Sandbox restricts access to the file system.
iOS Application Sandboxing has a set of rules that limits access to the file system. Apps can only access files in their own sandboxed home directory.
| Directory | Description |
| --- | --- |
| Documents
| The app’s sandboxed documents directory. The contents of this directory are backed up by iTunes and may be set as accessible to the user via iTunes when UIFileSharingEnabled
is set to true
in the application's info.plist
. |
| Library
| The app’s sandboxed library directory. The contents of this directory are synchronized via iTunes (except the Library/Caches
subdirectory, see below), but never exposed to the user. |
| Library/Caches
| The app’s sandboxed caches directory. The contents of this directory are not synchronized via iTunes and may be deleted by the system at any time. It's a good place to store data which provides a good offline-first experience for the user. |
| Library/Preferences
| The app’s sandboxed preferences directory. The contents of this directory are synchronized via iTunes. Its purpose is to be used by the Settings app. Avoid creating your own files in this directory. |
| tmp
| The app’s sandboxed temporary directory. The contents of this directory are not synchronized via iTunes and may be deleted by the system at any time. Although, it's recommended that you delete data that is not necessary anymore manually to minimize the space your app takes up on the file system. Use this directory to store data that is only useful during the app runtime. |
Example usage:
import fs from 'socket:fs/promises'
access(path, mode, options)
External docs: https://nodejs.org/dist/latest-v20.x/docs/api/fs.html#fspromisesaccesspath-mode Asynchronously check access a file.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | mode | string? | | true | | | options | object? | | true | |
chmod(path, mode)
External docs: https://nodejs.org/api/fs.html#fspromiseschmodpath-mode
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | mode | number | | false | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
chown(path, uid, gid)
Changes ownership of file or directory at path
with uid
and gid
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | uid | number | | false | | | gid | number | | false | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
copyFile(src, dest, flags)
Asynchronously copies src
to dest
calling callback
upon success or error.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | The source file path. | | dest | string | | false | The destination file path. | | flags | number | | false | Modifiers for copy operation. |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
lchown(path, uid, gid)
Chages ownership of link at path
with uid
and `gid.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | | | uid | number | | false | | | gid | number | | false | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
link(src, dest)
Creates a link to dest
from dest
.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | src | string | | false | | | dest | string | | false | |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
mkdir(path, options)
Asynchronously creates a directory.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | | false | The path to create | | options | object | | true | The optional options argument can be an integer specifying mode (permission and sticky bits), or an object with a mode property and a recursive property indicating whether parent directories should be created. Calling fs.mkdir() when path is a directory that exists results in an error only when recursive is false. | | options.recursive | boolean | false | true | Recursively create missing path segments. | | options.mode | number | 0o777 | true | Set the mode of directory, or missing path segments when recursive is true. |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | Upon success, fulfills with undefined if recursive is false, or the first directory path created if recursive is true. |
open(path, flags, mode)
External docs: https://nodejs.org/api/fs.html#fspromisesopenpath-flags-mode Asynchronously open a file.
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | flags | string | | true | default: 'r' | | mode | number | | true | default: 0o666 |
| Return Value | Type | Description | | :--- | :--- | :--- | | Not specified | Promise | |
opendir(path, options)
External docs: https://nodejs.org/api/fs.html#fspromisesopendirpath-options
| Argument | Type | Default | Optional | Description | | :--- | :--- | :---: | :---: | :--- | | path | string | Buffer | URL | | false | | | options | object? | | true | | | options.encoding | string? | utf8 | true | | | options.bufferSize | number? | 32 | true | |
|