promises.appendFile - node__fs.d.ts - Node

function promises.appendFile

Usage in Deno

```typescript import { promises } from "node:node__fs.d.ts"; ```



appendFile(path: PathLike | FileHandle,
data: string | Uint8Array,
options?: (ObjectEncodingOptions
 & FlagAndOpenMode
 & { flush?: boolean | undefined;  }
)
 | BufferEncoding
 | null,
): Promise<void>

Asynchronously append data to a file, creating the file if it does not yet exist. `data` can be a string or a `Buffer`. If `options` is a string, then it specifies the `encoding`. The `mode` option only affects the newly created file. See `fs.open()` for more details. The `path` may be specified as a `FileHandle` that has been opened for appending (using `fsPromises.open()`).

Parameters



path: PathLike | FileHandle

filename or {FileHandle}



data: string | Uint8Array

optional



options: (ObjectEncodingOptions
 & FlagAndOpenMode
 & { flush?: boolean | undefined;  }
)
 | BufferEncoding
 | null

Return Type

Promise<void>

Fulfills with `undefined` upon success.