# All files / src/tx/applyTx checkEpochLength.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 { Type } = require('leap-core');

    module.exports = (state, tx, bridgeState) => {
      if (tx.type !== Type.EPOCH_LENGTH) {
        throw new Error('epochLength tx expected');
      }

      if (
        state.epoch.epochLengthIndex + 1 !==
        bridgeState.epochLengths.length - 1
      ) {
        throw new Error('Unknown epochLength change');
      }

      if (
        bridgeState.epochLengths[state.epoch.epochLengthIndex + 1] !==
        tx.options.epochLength
      ) {
        throw new Error('Wrong epoch length');
      }

      state.epoch.epochLengthIndex += 1;
      state.epoch.epochLength = tx.options.epochLength;
    };