brk/website_next/explore/block/preview/fees.js

import {
  createFeeRateRange,
  FEE_RATE_STOPS,
  getFeeRateStopByRank,
} from "../fee-rates.js";

/**
 * @param {BlockPreviewTransaction[]} transactions
 */
export function createPreviewFeeRange(transactions) {
  return createFeeRateRange(transactions.map(({ feeRate }) => feeRate));
}

/**
 * @param {number} index
 * @param {number} count
 */
export function getFeeBucket(index, count) {
  return getFeeRateStopByRank(index, count);
}

/**
 * @param {BlockPreviewTransaction[]} transactions
 */
export function orderTransactions(transactions) {
  return transactions
    .toSorted((a, b) => b.feeRate - a.feeRate || b.weight - a.weight);
}

/**
 * @typedef {Object} BlockPreviewTransaction
 * @property {string} txid
 * @property {number} version
 * @property {number} weight
 * @property {number} feeRate
 */

export { FEE_RATE_STOPS as FEE_BUCKETS };