# All files / 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)
        );