write method

@override Future<void> write(String ref, String contents)

Replace the whole record.

Implementations that can, write atomically — a half-written preferences file is worse than an absent one, because the absent one is recoverable by the same code path that handles a first run.

Implementation

@override
Future<void> write(String ref, String contents) async {
  final file = await _fileHandle(ref, create: true);
  final writable = await file!.createWritable().toDart;
  // The default truncates, and the spec has the stream land on the real
  // file only at close — so a torn write leaves the previous contents
  // rather than half of the new ones.
  await writable.write(contents.toJS).toDart;
  await writable.close().toDart;
}