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arguments[1] : {};\n\n    _classCallCheck(this, Backend);\n\n    this.backends = [];\n    this.type = 'backend';\n    this.init(services, options);\n  }\n\n  _createClass(Backend, [{\n    key: \"init\",\n    value: function init(services) {\n      var _this = this;\n\n      var options = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};\n      var i18nextOptions = arguments.length > 2 ? arguments[2] : undefined;\n      this.services = services;\n      this.options = defaults(options, this.options || {}, getDefaults());\n      this.options.backends && this.options.backends.forEach(function (b, i) {\n        _this.backends[i] = _this.backends[i] || createClassOnDemand(b);\n\n        _this.backends[i].init(services, _this.options.backendOptions && _this.options.backendOptions[i] || {}, i18nextOptions);\n      });\n    }\n  }, {\n    key: \"read\",\n    value: function read(language, namespace, callback) {\n      var _this2 = this;\n\n      var bLen = this.backends.length;\n\n      var loadPosition = function loadPosition(pos) {\n        if (pos >= bLen) return callback(new Error('non of the backend loaded data;', true)); // failed pass retry flag\n\n        var isLastBackend = pos === bLen - 1;\n        var lengthCheckAmount = _this2.options.handleEmptyResourcesAsFailed && !isLastBackend ? 0 : -1;\n        var backend = _this2.backends[pos];\n\n        if (backend.read) {\n          backend.read(language, namespace, function (err, data) {\n            if (!err && data && Object.keys(data).length > lengthCheckAmount) {\n              callback(null, data, pos);\n              savePosition(pos - 1, data); // save one in front\n            } else {\n              loadPosition(pos + 1); // try load from next\n            }\n          });\n        } else {\n          loadPosition(pos + 1); // try load from next\n        }\n      };\n\n      var savePosition = function savePosition(pos, data) {\n        if (pos < 0) return;\n        var backend = _this2.backends[pos];\n\n        if (backend.save) {\n          backend.save(language, namespace, data);\n          savePosition(pos - 1, data);\n        } else {\n          savePosition(pos - 1, data);\n        }\n      };\n\n      loadPosition(0);\n    }\n  }, {\n    key: \"create\",\n    value: function create(languages, namespace, key, fallbackValue) {\n      this.backends.forEach(function (b) {\n        if (b.create) b.create(languages, namespace, key, fallbackValue);\n      });\n    }\n  }]);\n\n  return Backend;\n}();\n\nBackend.type = 'backend';\n\nexport default Backend;\n"],"sourceRoot":""}