AbiFallback
ABI "fallback" type
type AbiFallback = {  payable?: boolean;  stateMutability: Extract<    AbiStateMutability,    "payable" | "nonpayable"  >;  type: "fallback";};
Deprecated
 use payable  or nonpayable  from AbiStateMutability instead
https://github.com/ethereum/solidity/issues/992
type payable = boolean;
type stateMutability = Extract<  AbiStateMutability,  "payable" | "nonpayable">;
type type = "fallback";