ERC721 constructor
const
ERC721({})
Implementation
const factory ERC721(
{required final String symbol,
@JsonKey(fromJson: nameFromJson) required final String name,
@JsonKey(fromJson: decimalsFromJson) required final int decimals,
@JsonKey(name: 'contractAddress', fromJson: addressFromJson)
required final String address,
@JsonKey(name: 'balance') required final BigInt amount}) = _$ERC721Impl;