function appendFileSync
Usage in Deno
```typescript import { appendFileSync } from "node:node__fs.d.ts"; ```
appendFileSync(): void
Synchronously 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](../.././node__fs.d.ts/~/open) for more details.
```js
import { appendFileSync } from 'node:fs';
try {
appendFileSync('message.txt', 'data to append');
console.log('The "data to append" was appended to file!');
} catch (err) {
// Handle the error
}
```
If `options` is a string, then it specifies the encoding:
```js
import { appendFileSync } from 'node:fs';
appendFileSync('message.txt', 'data to append', 'utf8');
```
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.
```js
import { openSync, closeSync, appendFileSync } from 'node:fs';
let fd;
try {
fd = openSync('message.txt', 'a');
appendFileSync(fd, 'data to append', 'utf8');
} catch (err) {
// Handle the error
} finally {
if (fd !== undefined)
closeSync(fd);
}
```
path: PathOrFileDescriptor
filename or file descriptor
optional
options: WriteFileOptions
void