circomlib/src/smt_hashes_poseidon.js

const ZqField = require("ffjavascript").ZqField;
const Scalar = require("ffjavascript").Scalar;

const poseidon = require("./poseidon");

const F = new ZqField(Scalar.fromString("21888242871839275222246405745257275088548364400416034343698204186575808495617"));


exports.hash0 = function (left, right) {
    return poseidon([left, right]);
};

exports.hash1 = function(key, value) {
    return poseidon([key, value, F.one]);
};

exports.F = F;