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Dir : ~/var/www/invoice/node_modules/flat-cache/src/

Edit File: cache.js

var path = require('path');
var fs = require('fs');
var utils = require('./utils');
var del = require('./del');
var writeJSON = utils.writeJSON;

var cache = {
  /**
   * Load a cache identified by the given Id. If the element does not exists, then initialize an empty
   * cache storage. If specified `cacheDir` will be used as the directory to persist the data to. If omitted
   * then the cache module directory `./cache` will be used instead
   *
   * @method load
   * @param docId {String} the id of the cache, would also be used as the name of the file cache
   * @param [cacheDir] {String} directory for the cache entry
   */
  load: function (docId, cacheDir) {
    var me = this;

me._visited = {};
    me._persisted = {};
    me._pathToFile = cacheDir ? path.resolve(cacheDir, docId) : path.resolve(__dirname, '../.cache/', docId);

if (fs.existsSync(me._pathToFile)) {
      me._persisted = utils.tryParse(me._pathToFile, {});
    }
  },

/**
   * Load the cache from the provided file
   * @method loadFile
   * @param  {String} pathToFile the path to the file containing the info for the cache
   */
  loadFile: function (pathToFile) {
    var me = this;
    var dir = path.dirname(pathToFile);
    var fName = path.basename(pathToFile);

me.load(fName, dir);
  },

/**
   * Returns the entire persisted object
   * @method all
   * @returns {*}
   */
  all: function () {
    return this._persisted;
  },

keys: function () {
    return Object.keys(this._persisted);
  },
  /**
   * sets a key to a given value
   * @method setKey
   * @param key {string} the key to set
   * @param value {object} the value of the key. Could be any object that can be serialized with JSON.stringify
   */
  setKey: function (key, value) {
    this._visited[key] = true;
    this._persisted[key] = value;
  },
  /**
   * remove a given key from the cache
   * @method removeKey
   * @param key {String} the key to remove from the object
   */
  removeKey: function (key) {
    delete this._visited[key]; // esfmt-ignore-line
    delete this._persisted[key]; // esfmt-ignore-line
  },
  /**
   * Return the value of the provided key
   * @method getKey
   * @param key {String} the name of the key to retrieve
   * @returns {*} the value from the key
   */
  getKey: function (key) {
    this._visited[key] = true;
    return this._persisted[key];
  },

/**
   * Remove keys that were not accessed/set since the
   * last time the `prune` method was called.
   * @method _prune
   * @private
   */
  _prune: function () {
    var me = this;
    var obj = {};

var keys = Object.keys(me._visited);

// no keys visited for either get or set value
    if (keys.length === 0) {
      return;
    }

keys.forEach(function (key) {
      obj[key] = me._persisted[key];
    });

me._visited = {};
    me._persisted = obj;
  },

/**
   * Save the state of the cache identified by the docId to disk
   * as a JSON structure
   * @param [noPrune=false] {Boolean} whether to remove from cache the non visited files
   * @method save
   */
  save: function (noPrune) {
    var me = this;

!noPrune && me._prune();
    writeJSON(me._pathToFile, me._persisted);
  },

/**
   * remove the file where the cache is persisted
   * @method removeCacheFile
   * @return {Boolean} true or false if the file was successfully deleted
   */
  removeCacheFile: function () {
    return del(this._pathToFile);
  },
  /**
   * Destroy the file cache and cache content.
   * @method destroy
   */
  destroy: function () {
    var me = this;
    me._visited = {};
    me._persisted = {};

me.removeCacheFile();
  },
};

module.exports = {
  /**
   * Alias for create. Should be considered depreacted. Will be removed in next releases
   *
   * @method load
   * @param docId {String} the id of the cache, would also be used as the name of the file cache
   * @param [cacheDir] {String} directory for the cache entry
   * @returns {cache} cache instance
   */
  load: function (docId, cacheDir) {
    return this.create(docId, cacheDir);
  },

/**
   * Load a cache identified by the given Id. If the element does not exists, then initialize an empty
   * cache storage.
   *
   * @method create
   * @param docId {String} the id of the cache, would also be used as the name of the file cache
   * @param [cacheDir] {String} directory for the cache entry
   * @returns {cache} cache instance
   */
  create: function (docId, cacheDir) {
    var obj = Object.create(cache);
    obj.load(docId, cacheDir);
    return obj;
  },

createFromFile: function (filePath) {
    var obj = Object.create(cache);
    obj.loadFile(filePath);
    return obj;
  },
  /**
   * Clear the cache identified by the given id. Caches stored in a different cache directory can be deleted directly
   *
   * @method clearCache
   * @param docId {String} the id of the cache, would also be used as the name of the file cache
   * @param cacheDir {String} the directory where the cache file was written
   * @returns {Boolean} true if the cache folder was deleted. False otherwise
   */
  clearCacheById: function (docId, cacheDir) {
    var filePath = cacheDir ? path.resolve(cacheDir, docId) : path.resolve(__dirname, '../.cache/', docId);
    return del(filePath);
  },
  /**
   * Remove all cache stored in the cache directory
   * @method clearAll
   * @returns {Boolean} true if the cache folder was deleted. False otherwise
   */
  clearAll: function (cacheDir) {
    var filePath = cacheDir ? path.resolve(cacheDir) : path.resolve(__dirname, '../.cache/');
    return del(filePath);
  },
};