Function appendFile

appendFile(
    filePath: string,
    contents: WriteFileContent,
    options?: AppendOptions,
): AsyncVoidIOResult
Appends content to a file at the specified path. Creates the file if it doesn't exist (unless create: false is specified).
Parameters
- filePath: string
  The absolute path of the file to append to.
- contents: WriteFileContent
  The content to append (string, ArrayBuffer, TypedArray, or Blob).
- Optionaloptions: AppendOptions
  Optional append options.
  
  Options for appending to files.
  - Optionalcreate?: boolean
    Whether to create the file if it does not exist.
    
    Default Value
    true
Returns AsyncVoidIOResult
A promise that resolves to an AsyncVoidIOResult indicating success or failure.
Since
1.0.0

See
writeFile with append: true option
Example
```
// Append to file, create if doesn't exist (default behavior)
await appendFile('/path/to/log.txt', 'New log entry\n');

// Append only if file exists, fail if it doesn't
await appendFile('/path/to/log.txt', 'New log entry\n', { create: false });
```
- Defined in async/ext.ts:28