hunk.code_window:   const state = {
       active: destination.destinations.length,
       flashing: destination.destinations.length,
       verifying: 0,
       failed: 0,
       successful: 0
     }
     function updateState() {
  
hunk.labels: keep keep keep keep keep replace keep keep
hunk.after_edit:     successful: 0,
       type: step
  
hunk.file_path: lib/gui/modules/child-writer.js
hunk.type: replace
file: /*
   * Copyright 2017 resin.io
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *    http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  
  'use strict'
  
  const _ = require('lodash')
  const errors = require('./errors')
  
  /**
   * @summary Minimum percentage value
   * @constant
   * @public
   * @type {Number}
   */
  exports.PERCENTAGE_MINIMUM = 0
  
  /**
   * @summary Maximum percentage value
   * @constant
   * @public
   * @type {Number}
   */
  exports.PERCENTAGE_MAXIMUM = 100
  
  /**
   * @summary Check if a percentage is valid
   * @function
   * @public
   *
   * @param {Number} percentage - percentage
   * @returns {Boolean} whether the percentage is valid
   *
   * @example
   * if (utils.isValidPercentage(85)) {
   *   console.log('The percentage is valid');
   * }
   */
  exports.isValidPercentage = (percentage) => {
    return _.every([
      _.isNumber(percentage),
      percentage >= exports.PERCENTAGE_MINIMUM,
      percentage <= exports.PERCENTAGE_MAXIMUM
    ])
  }
  
  /**
   * @summary Convert a percentage to a float
   * @function
   * @public
   *
   * @param {Number} percentage - percentage
   * @returns {Number} float percentage
   *
   * @example
   * const value = utils.percentageToFloat(50);
   * console.log(value);
   * > 0.5
   */
  exports.percentageToFloat = (percentage) => {
    if (!exports.isValidPercentage(percentage)) {
      throw errors.createError({
        title: `Invalid percentage: ${percentage}`
      })
    }
  
    return percentage / exports.PERCENTAGE_MAXIMUM
  }
  
  /**
   * @summary Memoize a function
   * @function
   * @private
   *
   * @description
   * This workaround is needed to avoid AngularJS from getting
   * caught in an infinite digest loop when using `ngRepeat`
   * over a function that returns a mutable version of an
   * ImmutableJS object.
   *
   * The problem is that every time you call `myImmutableObject.toJS()`
   * you will get a new object, whose reference is different from
   * the one you previously got, even if the data is exactly the same.
   *
   * @param {Function} func - function that returns an ImmutableJS list
   * @param {Function} comparer - function to compare old and new args and state
   * @returns {Function} memoized function
   *
   * @example
   * const getList = () => {
   *   return Store.getState().toJS().myList;
   * };
   *
   * const memoizedFunction = memoize(getList, angular.equals);
   */
  exports.memoize = (func, comparer) => {
    let previousTuples = []
  
    return (...restArgs) => {
      let areArgsInTuple = false
      let state = Reflect.apply(func, this, restArgs)
  
      previousTuples = _.map(previousTuples, ([ oldArgs, oldState ]) => {
        if (comparer(oldArgs, restArgs)) {
          areArgsInTuple = true
  
          if (comparer(state, oldState)) {
            // Use the previously memoized state for this argument
            state = oldState
          }
  
          // Update the tuple state
          return [ oldArgs, state ]
        }
  
        // Return the tuple unchanged
        return [ oldArgs, oldState ]
      })
  
      // Add the state associated with these args to be memoized
      if (!areArgsInTuple) {
        previousTuples.push([ restArgs, state ])
      }
  
      return state
    }
  }
  
  /**
   * @summary Check if obj has one or many specific props
   * @function
   * @public
   *
   * @param {Object} obj - object
   * @param {Array<String>} props - properties
   *
   * @returns {Boolean}
   *
   * @example
   * const doesIt = hasProps({ foo: 'bar' }, [ 'foo' ]);
   */
  exports.hasProps = (obj, props) => {
    return _.every(props, (prop) => {
      return _.has(obj, prop)
    })
  }
  