send-crypto/build/module/lib/utxo.js

A minimal JavaScript library / wallet for sending crypto assets

import BigNumber from "bignumber.js";
/**
 * sortUTXOs compares two UTXOs by amount, then confirmations and then hash.
 *
 * @example
 * sortUTXOs({amount: 1, confirmations: 1}, {amount: 2, confirmations: 0});
 * // -1, representing that the first parameter should be ordered first.
 *
 * @returns a negative value to represent that a should come before b or a
 * positive value to represent that b should come before a.
 */
export const sortUTXOs = (a, b) => {
    // Sort greater values first
    if (a.amount !== b.amount) {
        return b.amount - a.amount;
    }
    // Sort older UTXOs first
    if (a.confirmations !== b.confirmations) {
        return a.confirmations - b.confirmations;
    }
    return a.txHash <= b.txHash ? -1 : 1;
};
/**
 * fixValue turns a readable value, e.g. `0.0001` BTC, to the value in the smallest
 * unit, e.g. `10000` sats.
 *
 * @example
 * fixValue(0.0001, 8) = 10000;
 *
 * @param value Value in the readable representation, e.g. `0.0001` BTC.
 * @param decimals The number of decimals to shift by, e.g. 8.
 */
export const fixValue = (value, decimals) => new BigNumber(value)
    .multipliedBy(new BigNumber(10).exponentiatedBy(decimals))
    .decimalPlaces(0)
    .toNumber();
/**
 * fixUTXO calls {{fixValue}} on the value of the UTXO.
 */
export const fixUTXO = (utxo, decimals) => ({
    ...utxo,
    amount: fixValue(utxo.amount, decimals),
});
/**
 * fixUTXOs maps over an array of UTXOs and calls {{fixValue}}.
 */
export const fixUTXOs = (utxos, decimals) => {
    return utxos.map((utxo) => fixUTXO(utxo, decimals));
};
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