AppendFile

[<Interface>]
type AppendFile =
    abstract member Invoke (file: PathOrFileDescriptor, data: U2<string,Uint8Array<U2<ArrayBuffer,SharedArrayBuffer>>>, callback: NoParamCallback) : unit
    abstract member Invoke (path: PathOrFileDescriptor, data: U2<string,Uint8Array<U2<ArrayBuffer,SharedArrayBuffer>>>, options: WriteFileOptions, callback: NoParamCallback) : unit
    abstract member __promisify__ (file: PathOrFileDescriptor, data: U2<string,Uint8Array<U2<ArrayBuffer,SharedArrayBuffer>>>, ?options: U2<string,WriteFileOptions2>) : Promise<unit>


Assembly	`Xantham.Fable.Node`

Methods

abstract member Invoke (file: PathOrFileDescriptor, data: U2<string,Uint8Array<U2<ArrayBuffer,SharedArrayBuffer>>>, callback: NoParamCallback) : unit

Asynchronously append data to a file, creating the file if it does not yet exist. data can be a string or a Buffer.

The mode option only affects the newly created file. See open for more details.

import { appendFile } from 'node:fs';

appendFile('message.txt', 'data to append', (err) => {
if (err) throw err;
console.log('The "data to append" was appended to file!');
});

If options is a string, then it specifies the encoding:

import { appendFile } from 'node:fs';

appendFile('message.txt', 'data to append', 'utf8', callback);

The path may be specified as a numeric file descriptor that has been opened for appending (using fs.open() or fs.openSync()). The file descriptor will not be closed automatically.

import { open, close, appendFile } from 'node:fs';

function closeFd(fd) {
close(fd, (err) => {
if (err) throw err;
});
}

open('message.txt', 'a', (err, fd) => {
if (err) throw err;

try {
appendFile(fd, 'data to append', 'utf8', (err) => {
closeFd(fd);
if (err) throw err;
});
} catch (err) {
closeFd(fd);
throw err;
}
});

Asynchronously append data to a file, creating the file if it does not exist.

Parameter
`path`	filename or file descriptor
`file`	A path to a file. If a URL is provided, it must use the `file:` protocol. If a file descriptor is provided, the underlying file will not be closed automatically.
`data`	The data to write. If something other than a Buffer or Uint8Array is provided, the value is coerced to a string.

abstract member Invoke (path: PathOrFileDescriptor, data: U2<string,Uint8Array<U2<ArrayBuffer,SharedArrayBuffer>>>, options: WriteFileOptions, callback: NoParamCallback) : unit

Asynchronously append data to a file, creating the file if it does not yet exist. data can be a string or a Buffer.

The mode option only affects the newly created file. See open for more details.

import { appendFile } from 'node:fs';

appendFile('message.txt', 'data to append', (err) => {
if (err) throw err;
console.log('The "data to append" was appended to file!');
});

If options is a string, then it specifies the encoding:

import { appendFile } from 'node:fs';

appendFile('message.txt', 'data to append', 'utf8', callback);

The path may be specified as a numeric file descriptor that has been opened for appending (using fs.open() or fs.openSync()). The file descriptor will not be closed automatically.

import { open, close, appendFile } from 'node:fs';

function closeFd(fd) {
close(fd, (err) => {
if (err) throw err;
});
}

open('message.txt', 'a', (err, fd) => {
if (err) throw err;

try {
appendFile(fd, 'data to append', 'utf8', (err) => {
closeFd(fd);
if (err) throw err;
});
} catch (err) {
closeFd(fd);
throw err;
}
});

Asynchronously append data to a file, creating the file if it does not exist.

@since v0.6.7

Parameter
`path`	filename or file descriptor
`file`	A path to a file. If a URL is provided, it must use the `file:` protocol. If a file descriptor is provided, the underlying file will not be closed automatically.
`data`	The data to write. If something other than a Buffer or Uint8Array is provided, the value is coerced to a string.

abstract member __promisify__ (file: PathOrFileDescriptor, data: U2<string,Uint8Array<U2<ArrayBuffer,SharedArrayBuffer>>>, ?options: U2<string,WriteFileOptions2>) : Promise<unit>

Asynchronously append data to a file, creating the file if it does not exist.

Parameter
`file`	A path to a file. If a URL is provided, it must use the `file:` protocol. URL support is experimental. If a file descriptor is provided, the underlying file will not be closed automatically.
`data`	The data to write. If something other than a Buffer or Uint8Array is provided, the value is coerced to a string.
`options`	Either the encoding for the file, or an object optionally specifying the encoding, file mode, and flag. If `encoding` is not supplied, the default of `'utf8'` is used. If `mode` is not supplied, the default of `0o666` is used. If `mode` is a string, it is parsed as an octal integer. If `flag` is not supplied, the default of `'a'` is used.