function IsWritableStreamDefaultWriter(x) {
  if (!typeIsObject(x)) {
    return false;
  }

  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
    return false;
  }

  return true;
}
function IsWritableStreamDefaultWriter(x) {
  if (!typeIsObject(x)) {
    return false;
  }

  if (!Object.prototype.hasOwnProperty.call(x, '_ownerWritableStream')) {
    return false;
  }

  return true;
}
function IsWritableStreamDefaultWriter ( x ) { if ( ! typeIsObject ( x ) ) { return false ; } if ( ! Object . prototype . hasOwnProperty . call ( x , '_ownerWritableStream' ) ) { return false ; } return true ; }
Abstract operations for the WritableStreamDefaultWriter.
Abstract operations for the WritableStreamDefaultWriter .