dart:html

createFile method

Future<Entry> createFile(String path, { bool exclusive: false })

Create a new file with the specified path. If exclusive is true, the returned Future will complete with an error if a file already exists at the specified path.

Source

Future<Entry> createFile(String path, {bool exclusive: false}) {
  return _getFile(path, options: {'create': true, 'exclusive': exclusive});
}