@trezor/utxo-lib/lib/coinselect/outputs/split.js

Client-side Bitcoin-like JavaScript library

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.split = split;
const tslib_1 = require("tslib");
const bn_js_1 = tslib_1.__importDefault(require("bn.js"));
const coinselectUtils_1 = require("../coinselectUtils");
function split(utxosOrig, outputs, feeRate, options) {
  const coinbase = options.coinbase || coinselectUtils_1.MINIMAL_COINBASE_CONFIRMATIONS;
  const utxos = (0, coinselectUtils_1.filterCoinbase)(utxosOrig, coinbase);
  const fee = (0, coinselectUtils_1.getFee)(utxos, outputs, feeRate, options);
  if (outputs.length === 0) return {
    fee
  };
  const inAccum = (0, coinselectUtils_1.sumOrNaN)(utxos);
  const outAccum = (0, coinselectUtils_1.sumOrNaN)(outputs, true);
  if (!inAccum) return {
    fee
  };
  const remaining = inAccum.sub(outAccum).sub(new bn_js_1.default(fee));
  if (remaining.lt(coinselectUtils_1.ZERO)) return {
    fee
  };
  const unspecified = outputs.reduce((a, x) => a + (!(0, coinselectUtils_1.bignumberOrNaN)(x.value) ? 1 : 0), 0);
  if (remaining.isZero() || unspecified === 0) {
    return (0, coinselectUtils_1.finalize)(utxos, outputs, feeRate, options);
  }
  const splitValue = remaining.div(new bn_js_1.default(unspecified));
  const dustAmount = (0, coinselectUtils_1.getDustAmount)(feeRate, options);
  if (unspecified && splitValue.lt(new bn_js_1.default(dustAmount))) return {
    fee
  };
  const outputsSplit = outputs.map(output => {
    if (output.value) return output;
    return {
      ...output,
      value: splitValue
    };
  });
  return (0, coinselectUtils_1.finalize)(utxos, outputsSplit, feeRate, options);
}
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