leap-node/src/utils/buildCas.js

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/**
 * Copyright (c) 2018-present, Leap DAO (leapdao.org)
 *
 * This source code is licensed under the Mozilla Public License Version 2.0
 * found in the LICENSE file in the root directory of this source tree.
 */

const { BigInt, leftShift, bitwiseOr } = require('jsbi');

module.exports = slotIds =>
  slotIds
    .filter(k => k < 256)
    .reduce(
      (cas, slotId) =>
        bitwiseOr(cas, leftShift(BigInt(1), BigInt(255 - slotId))),
      BigInt(0)
    );