Snarklibjs's poseidon ABI

Poseidon.json

[
    {
       "constant":true,
       "inputs":[
          {
             "internalType":"bytes32[2]",
             "name":"input",
             "type":"bytes32[2]"
          }
       ],
       "name":"poseidon",
       "outputs":[
          {
             "internalType":"bytes32",
             "name":"",
             "type":"bytes32"
          }
       ],
       "payable":false,
       "stateMutability":"pure",
       "type":"function"
    },
    {
       "constant":true,
       "inputs":[
          {
             "internalType":"uint256[2]",
             "name":"input",
             "type":"uint256[2]"
          }
       ],
       "name":"poseidon",
       "outputs":[
          {
             "internalType":"uint256",
             "name":"",
             "type":"uint256"
          }
       ],
       "payable":false,
       "stateMutability":"pure",
       "type":"function"
    }
 ]