const Utf8Decoder({bool allowMalformed: false })

Instantiates a new Utf8Decoder.

The optional allowMalformed argument defines how convert deals with invalid or unterminated character sequences.

If it is true convert replaces invalid (or unterminated) character sequences with the Unicode Replacement character U+FFFD (�). Otherwise it throws a FormatException.

Source 

const Utf8Decoder({ bool allowMalformed: false })
    : this._allowMalformed = allowMalformed;