.firebaseio.com');\r\n }\r\n if (!parsedUrl.secure) {\r\n warnIfPageIsSecure();\r\n }\r\n const webSocketOnly = parsedUrl.scheme === 'ws' || parsedUrl.scheme === 'wss';\r\n return {\r\n repoInfo: new RepoInfo(parsedUrl.host, parsedUrl.secure, namespace, webSocketOnly, nodeAdmin, \r\n /*persistenceKey=*/ '', \r\n /*includeNamespaceInQueryParams=*/ namespace !== parsedUrl.subdomain),\r\n path: new Path(parsedUrl.pathString)\r\n };\r\n};\r\nconst parseDatabaseURL = function (dataURL) {\r\n // Default to empty strings in the event of a malformed string.\r\n let host = '', domain = '', subdomain = '', pathString = '', namespace = '';\r\n // Always default to SSL, unless otherwise specified.\r\n let secure = true, scheme = 'https', port = 443;\r\n // Don't do any validation here. The caller is responsible for validating the result of parsing.\r\n if (typeof dataURL === 'string') {\r\n // Parse scheme.\r\n let colonInd = dataURL.indexOf('//');\r\n if (colonInd >= 0) {\r\n scheme = dataURL.substring(0, colonInd - 1);\r\n dataURL = dataURL.substring(colonInd + 2);\r\n }\r\n // Parse host, path, and query string.\r\n let slashInd = dataURL.indexOf('/');\r\n if (slashInd === -1) {\r\n slashInd = dataURL.length;\r\n }\r\n let questionMarkInd = dataURL.indexOf('?');\r\n if (questionMarkInd === -1) {\r\n questionMarkInd = dataURL.length;\r\n }\r\n host = dataURL.substring(0, Math.min(slashInd, questionMarkInd));\r\n if (slashInd < questionMarkInd) {\r\n // For pathString, questionMarkInd will always come after slashInd\r\n pathString = decodePath(dataURL.substring(slashInd, questionMarkInd));\r\n }\r\n const queryParams = decodeQuery(dataURL.substring(Math.min(dataURL.length, questionMarkInd)));\r\n // If we have a port, use scheme for determining if it's secure.\r\n colonInd = host.indexOf(':');\r\n if (colonInd >= 0) {\r\n secure = scheme === 'https' || scheme === 'wss';\r\n port = parseInt(host.substring(colonInd + 1), 10);\r\n }\r\n else {\r\n colonInd = host.length;\r\n }\r\n const hostWithoutPort = host.slice(0, colonInd);\r\n if (hostWithoutPort.toLowerCase() === 'localhost') {\r\n domain = 'localhost';\r\n }\r\n else if (hostWithoutPort.split('.').length <= 2) {\r\n domain = hostWithoutPort;\r\n }\r\n else {\r\n // Interpret the subdomain of a 3 or more component URL as the namespace name.\r\n const dotInd = host.indexOf('.');\r\n subdomain = host.substring(0, dotInd).toLowerCase();\r\n domain = host.substring(dotInd + 1);\r\n // Normalize namespaces to lowercase to share storage / connection.\r\n namespace = subdomain;\r\n }\r\n // Always treat the value of the `ns` as the namespace name if it is present.\r\n if ('ns' in queryParams) {\r\n namespace = queryParams['ns'];\r\n }\r\n }\r\n return {\r\n host,\r\n port,\r\n domain,\r\n subdomain,\r\n secure,\r\n scheme,\r\n pathString,\r\n namespace\r\n };\r\n};\n\n/**\r\n * @license\r\n * Copyright 2017 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n// Modeled after base64 web-safe chars, but ordered by ASCII.\r\nconst PUSH_CHARS = '-0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ_abcdefghijklmnopqrstuvwxyz';\r\n/**\r\n * Fancy ID generator that creates 20-character string identifiers with the\r\n * following properties:\r\n *\r\n * 1. They're based on timestamp so that they sort *after* any existing ids.\r\n * 2. They contain 72-bits of random data after the timestamp so that IDs won't\r\n * collide with other clients' IDs.\r\n * 3. They sort *lexicographically* (so the timestamp is converted to characters\r\n * that will sort properly).\r\n * 4. They're monotonically increasing. Even if you generate more than one in\r\n * the same timestamp, the latter ones will sort after the former ones. We do\r\n * this by using the previous random bits but \"incrementing\" them by 1 (only\r\n * in the case of a timestamp collision).\r\n */\r\nconst nextPushId = (function () {\r\n // Timestamp of last push, used to prevent local collisions if you push twice\r\n // in one ms.\r\n let lastPushTime = 0;\r\n // We generate 72-bits of randomness which get turned into 12 characters and\r\n // appended to the timestamp to prevent collisions with other clients. We\r\n // store the last characters we generated because in the event of a collision,\r\n // we'll use those same characters except \"incremented\" by one.\r\n const lastRandChars = [];\r\n return function (now) {\r\n const duplicateTime = now === lastPushTime;\r\n lastPushTime = now;\r\n let i;\r\n const timeStampChars = new Array(8);\r\n for (i = 7; i >= 0; i--) {\r\n timeStampChars[i] = PUSH_CHARS.charAt(now % 64);\r\n // NOTE: Can't use << here because javascript will convert to int and lose\r\n // the upper bits.\r\n now = Math.floor(now / 64);\r\n }\r\n assert(now === 0, 'Cannot push at time == 0');\r\n let id = timeStampChars.join('');\r\n if (!duplicateTime) {\r\n for (i = 0; i < 12; i++) {\r\n lastRandChars[i] = Math.floor(Math.random() * 64);\r\n }\r\n }\r\n else {\r\n // If the timestamp hasn't changed since last push, use the same random\r\n // number, except incremented by 1.\r\n for (i = 11; i >= 0 && lastRandChars[i] === 63; i--) {\r\n lastRandChars[i] = 0;\r\n }\r\n lastRandChars[i]++;\r\n }\r\n for (i = 0; i < 12; i++) {\r\n id += PUSH_CHARS.charAt(lastRandChars[i]);\r\n }\r\n assert(id.length === 20, 'nextPushId: Length should be 20.');\r\n return id;\r\n };\r\n})();\n\n/**\r\n * @license\r\n * Copyright 2017 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * Encapsulates the data needed to raise an event\r\n */\r\nclass DataEvent {\r\n /**\r\n * @param eventType - One of: value, child_added, child_changed, child_moved, child_removed\r\n * @param eventRegistration - The function to call to with the event data. User provided\r\n * @param snapshot - The data backing the event\r\n * @param prevName - Optional, the name of the previous child for child_* events.\r\n */\r\n constructor(eventType, eventRegistration, snapshot, prevName) {\r\n this.eventType = eventType;\r\n this.eventRegistration = eventRegistration;\r\n this.snapshot = snapshot;\r\n this.prevName = prevName;\r\n }\r\n getPath() {\r\n const ref = this.snapshot.ref;\r\n if (this.eventType === 'value') {\r\n return ref._path;\r\n }\r\n else {\r\n return ref.parent._path;\r\n }\r\n }\r\n getEventType() {\r\n return this.eventType;\r\n }\r\n getEventRunner() {\r\n return this.eventRegistration.getEventRunner(this);\r\n }\r\n toString() {\r\n return (this.getPath().toString() +\r\n ':' +\r\n this.eventType +\r\n ':' +\r\n stringify(this.snapshot.exportVal()));\r\n }\r\n}\r\nclass CancelEvent {\r\n constructor(eventRegistration, error, path) {\r\n this.eventRegistration = eventRegistration;\r\n this.error = error;\r\n this.path = path;\r\n }\r\n getPath() {\r\n return this.path;\r\n }\r\n getEventType() {\r\n return 'cancel';\r\n }\r\n getEventRunner() {\r\n return this.eventRegistration.getEventRunner(this);\r\n }\r\n toString() {\r\n return this.path.toString() + ':cancel';\r\n }\r\n}\n\n/**\r\n * @license\r\n * Copyright 2017 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * A wrapper class that converts events from the database@exp SDK to the legacy\r\n * Database SDK. Events are not converted directly as event registration relies\r\n * on reference comparison of the original user callback (see `matches()`) and\r\n * relies on equality of the legacy SDK's `context` object.\r\n */\r\nclass CallbackContext {\r\n constructor(snapshotCallback, cancelCallback) {\r\n this.snapshotCallback = snapshotCallback;\r\n this.cancelCallback = cancelCallback;\r\n }\r\n onValue(expDataSnapshot, previousChildName) {\r\n this.snapshotCallback.call(null, expDataSnapshot, previousChildName);\r\n }\r\n onCancel(error) {\r\n assert(this.hasCancelCallback, 'Raising a cancel event on a listener with no cancel callback');\r\n return this.cancelCallback.call(null, error);\r\n }\r\n get hasCancelCallback() {\r\n return !!this.cancelCallback;\r\n }\r\n matches(other) {\r\n return (this.snapshotCallback === other.snapshotCallback ||\r\n (this.snapshotCallback.userCallback !== undefined &&\r\n this.snapshotCallback.userCallback ===\r\n other.snapshotCallback.userCallback &&\r\n this.snapshotCallback.context === other.snapshotCallback.context));\r\n }\r\n}\n\n/**\r\n * @license\r\n * Copyright 2021 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * The `onDisconnect` class allows you to write or clear data when your client\r\n * disconnects from the Database server. These updates occur whether your\r\n * client disconnects cleanly or not, so you can rely on them to clean up data\r\n * even if a connection is dropped or a client crashes.\r\n *\r\n * The `onDisconnect` class is most commonly used to manage presence in\r\n * applications where it is useful to detect how many clients are connected and\r\n * when other clients disconnect. See\r\n * {@link https://firebase.google.com/docs/database/web/offline-capabilities | Enabling Offline Capabilities in JavaScript}\r\n * for more information.\r\n *\r\n * To avoid problems when a connection is dropped before the requests can be\r\n * transferred to the Database server, these functions should be called before\r\n * writing any data.\r\n *\r\n * Note that `onDisconnect` operations are only triggered once. If you want an\r\n * operation to occur each time a disconnect occurs, you'll need to re-establish\r\n * the `onDisconnect` operations each time you reconnect.\r\n */\r\nclass OnDisconnect {\r\n /** @hideconstructor */\r\n constructor(_repo, _path) {\r\n this._repo = _repo;\r\n this._path = _path;\r\n }\r\n /**\r\n * Cancels all previously queued `onDisconnect()` set or update events for this\r\n * location and all children.\r\n *\r\n * If a write has been queued for this location via a `set()` or `update()` at a\r\n * parent location, the write at this location will be canceled, though writes\r\n * to sibling locations will still occur.\r\n *\r\n * @returns Resolves when synchronization to the server is complete.\r\n */\r\n cancel() {\r\n const deferred = new Deferred();\r\n repoOnDisconnectCancel(this._repo, this._path, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n }\r\n /**\r\n * Ensures the data at this location is deleted when the client is disconnected\r\n * (due to closing the browser, navigating to a new page, or network issues).\r\n *\r\n * @returns Resolves when synchronization to the server is complete.\r\n */\r\n remove() {\r\n validateWritablePath('OnDisconnect.remove', this._path);\r\n const deferred = new Deferred();\r\n repoOnDisconnectSet(this._repo, this._path, null, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n }\r\n /**\r\n * Ensures the data at this location is set to the specified value when the\r\n * client is disconnected (due to closing the browser, navigating to a new page,\r\n * or network issues).\r\n *\r\n * `set()` is especially useful for implementing \"presence\" systems, where a\r\n * value should be changed or cleared when a user disconnects so that they\r\n * appear \"offline\" to other users. See\r\n * {@link https://firebase.google.com/docs/database/web/offline-capabilities | Enabling Offline Capabilities in JavaScript}\r\n * for more information.\r\n *\r\n * Note that `onDisconnect` operations are only triggered once. If you want an\r\n * operation to occur each time a disconnect occurs, you'll need to re-establish\r\n * the `onDisconnect` operations each time.\r\n *\r\n * @param value - The value to be written to this location on disconnect (can\r\n * be an object, array, string, number, boolean, or null).\r\n * @returns Resolves when synchronization to the Database is complete.\r\n */\r\n set(value) {\r\n validateWritablePath('OnDisconnect.set', this._path);\r\n validateFirebaseDataArg('OnDisconnect.set', value, this._path, false);\r\n const deferred = new Deferred();\r\n repoOnDisconnectSet(this._repo, this._path, value, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n }\r\n /**\r\n * Ensures the data at this location is set to the specified value and priority\r\n * when the client is disconnected (due to closing the browser, navigating to a\r\n * new page, or network issues).\r\n *\r\n * @param value - The value to be written to this location on disconnect (can\r\n * be an object, array, string, number, boolean, or null).\r\n * @param priority - The priority to be written (string, number, or null).\r\n * @returns Resolves when synchronization to the Database is complete.\r\n */\r\n setWithPriority(value, priority) {\r\n validateWritablePath('OnDisconnect.setWithPriority', this._path);\r\n validateFirebaseDataArg('OnDisconnect.setWithPriority', value, this._path, false);\r\n validatePriority('OnDisconnect.setWithPriority', priority, false);\r\n const deferred = new Deferred();\r\n repoOnDisconnectSetWithPriority(this._repo, this._path, value, priority, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n }\r\n /**\r\n * Writes multiple values at this location when the client is disconnected (due\r\n * to closing the browser, navigating to a new page, or network issues).\r\n *\r\n * The `values` argument contains multiple property-value pairs that will be\r\n * written to the Database together. Each child property can either be a simple\r\n * property (for example, \"name\") or a relative path (for example, \"name/first\")\r\n * from the current location to the data to update.\r\n *\r\n * As opposed to the `set()` method, `update()` can be use to selectively update\r\n * only the referenced properties at the current location (instead of replacing\r\n * all the child properties at the current location).\r\n *\r\n * @param values - Object containing multiple values.\r\n * @returns Resolves when synchronization to the Database is complete.\r\n */\r\n update(values) {\r\n validateWritablePath('OnDisconnect.update', this._path);\r\n validateFirebaseMergeDataArg('OnDisconnect.update', values, this._path, false);\r\n const deferred = new Deferred();\r\n repoOnDisconnectUpdate(this._repo, this._path, values, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n }\r\n}\n\n/**\r\n * @license\r\n * Copyright 2020 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * @internal\r\n */\r\nclass QueryImpl {\r\n /**\r\n * @hideconstructor\r\n */\r\n constructor(_repo, _path, _queryParams, _orderByCalled) {\r\n this._repo = _repo;\r\n this._path = _path;\r\n this._queryParams = _queryParams;\r\n this._orderByCalled = _orderByCalled;\r\n }\r\n get key() {\r\n if (pathIsEmpty(this._path)) {\r\n return null;\r\n }\r\n else {\r\n return pathGetBack(this._path);\r\n }\r\n }\r\n get ref() {\r\n return new ReferenceImpl(this._repo, this._path);\r\n }\r\n get _queryIdentifier() {\r\n const obj = queryParamsGetQueryObject(this._queryParams);\r\n const id = ObjectToUniqueKey(obj);\r\n return id === '{}' ? 'default' : id;\r\n }\r\n /**\r\n * An object representation of the query parameters used by this Query.\r\n */\r\n get _queryObject() {\r\n return queryParamsGetQueryObject(this._queryParams);\r\n }\r\n isEqual(other) {\r\n other = getModularInstance(other);\r\n if (!(other instanceof QueryImpl)) {\r\n return false;\r\n }\r\n const sameRepo = this._repo === other._repo;\r\n const samePath = pathEquals(this._path, other._path);\r\n const sameQueryIdentifier = this._queryIdentifier === other._queryIdentifier;\r\n return sameRepo && samePath && sameQueryIdentifier;\r\n }\r\n toJSON() {\r\n return this.toString();\r\n }\r\n toString() {\r\n return this._repo.toString() + pathToUrlEncodedString(this._path);\r\n }\r\n}\r\n/**\r\n * Validates that no other order by call has been made\r\n */\r\nfunction validateNoPreviousOrderByCall(query, fnName) {\r\n if (query._orderByCalled === true) {\r\n throw new Error(fnName + \": You can't combine multiple orderBy calls.\");\r\n }\r\n}\r\n/**\r\n * Validates start/end values for queries.\r\n */\r\nfunction validateQueryEndpoints(params) {\r\n let startNode = null;\r\n let endNode = null;\r\n if (params.hasStart()) {\r\n startNode = params.getIndexStartValue();\r\n }\r\n if (params.hasEnd()) {\r\n endNode = params.getIndexEndValue();\r\n }\r\n if (params.getIndex() === KEY_INDEX) {\r\n const tooManyArgsError = 'Query: When ordering by key, you may only pass one argument to ' +\r\n 'startAt(), endAt(), or equalTo().';\r\n const wrongArgTypeError = 'Query: When ordering by key, the argument passed to startAt(), startAfter(), ' +\r\n 'endAt(), endBefore(), or equalTo() must be a string.';\r\n if (params.hasStart()) {\r\n const startName = params.getIndexStartName();\r\n if (startName !== MIN_NAME) {\r\n throw new Error(tooManyArgsError);\r\n }\r\n else if (typeof startNode !== 'string') {\r\n throw new Error(wrongArgTypeError);\r\n }\r\n }\r\n if (params.hasEnd()) {\r\n const endName = params.getIndexEndName();\r\n if (endName !== MAX_NAME) {\r\n throw new Error(tooManyArgsError);\r\n }\r\n else if (typeof endNode !== 'string') {\r\n throw new Error(wrongArgTypeError);\r\n }\r\n }\r\n }\r\n else if (params.getIndex() === PRIORITY_INDEX) {\r\n if ((startNode != null && !isValidPriority(startNode)) ||\r\n (endNode != null && !isValidPriority(endNode))) {\r\n throw new Error('Query: When ordering by priority, the first argument passed to startAt(), ' +\r\n 'startAfter() endAt(), endBefore(), or equalTo() must be a valid priority value ' +\r\n '(null, a number, or a string).');\r\n }\r\n }\r\n else {\r\n assert(params.getIndex() instanceof PathIndex ||\r\n params.getIndex() === VALUE_INDEX, 'unknown index type.');\r\n if ((startNode != null && typeof startNode === 'object') ||\r\n (endNode != null && typeof endNode === 'object')) {\r\n throw new Error('Query: First argument passed to startAt(), startAfter(), endAt(), endBefore(), or ' +\r\n 'equalTo() cannot be an object.');\r\n }\r\n }\r\n}\r\n/**\r\n * Validates that limit* has been called with the correct combination of parameters\r\n */\r\nfunction validateLimit(params) {\r\n if (params.hasStart() &&\r\n params.hasEnd() &&\r\n params.hasLimit() &&\r\n !params.hasAnchoredLimit()) {\r\n throw new Error(\"Query: Can't combine startAt(), startAfter(), endAt(), endBefore(), and limit(). Use \" +\r\n 'limitToFirst() or limitToLast() instead.');\r\n }\r\n}\r\n/**\r\n * @internal\r\n */\r\nclass ReferenceImpl extends QueryImpl {\r\n /** @hideconstructor */\r\n constructor(repo, path) {\r\n super(repo, path, new QueryParams(), false);\r\n }\r\n get parent() {\r\n const parentPath = pathParent(this._path);\r\n return parentPath === null\r\n ? null\r\n : new ReferenceImpl(this._repo, parentPath);\r\n }\r\n get root() {\r\n let ref = this;\r\n while (ref.parent !== null) {\r\n ref = ref.parent;\r\n }\r\n return ref;\r\n }\r\n}\r\n/**\r\n * A `DataSnapshot` contains data from a Database location.\r\n *\r\n * Any time you read data from the Database, you receive the data as a\r\n * `DataSnapshot`. A `DataSnapshot` is passed to the event callbacks you attach\r\n * with `on()` or `once()`. You can extract the contents of the snapshot as a\r\n * JavaScript object by calling the `val()` method. Alternatively, you can\r\n * traverse into the snapshot by calling `child()` to return child snapshots\r\n * (which you could then call `val()` on).\r\n *\r\n * A `DataSnapshot` is an efficiently generated, immutable copy of the data at\r\n * a Database location. It cannot be modified and will never change (to modify\r\n * data, you always call the `set()` method on a `Reference` directly).\r\n */\r\nclass DataSnapshot {\r\n /**\r\n * @param _node - A SnapshotNode to wrap.\r\n * @param ref - The location this snapshot came from.\r\n * @param _index - The iteration order for this snapshot\r\n * @hideconstructor\r\n */\r\n constructor(_node, \r\n /**\r\n * The location of this DataSnapshot.\r\n */\r\n ref, _index) {\r\n this._node = _node;\r\n this.ref = ref;\r\n this._index = _index;\r\n }\r\n /**\r\n * Gets the priority value of the data in this `DataSnapshot`.\r\n *\r\n * Applications need not use priority but can order collections by\r\n * ordinary properties (see\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data |Sorting and filtering data}\r\n * ).\r\n */\r\n get priority() {\r\n // typecast here because we never return deferred values or internal priorities (MAX_PRIORITY)\r\n return this._node.getPriority().val();\r\n }\r\n /**\r\n * The key (last part of the path) of the location of this `DataSnapshot`.\r\n *\r\n * The last token in a Database location is considered its key. For example,\r\n * \"ada\" is the key for the /users/ada/ node. Accessing the key on any\r\n * `DataSnapshot` will return the key for the location that generated it.\r\n * However, accessing the key on the root URL of a Database will return\r\n * `null`.\r\n */\r\n get key() {\r\n return this.ref.key;\r\n }\r\n /** Returns the number of child properties of this `DataSnapshot`. */\r\n get size() {\r\n return this._node.numChildren();\r\n }\r\n /**\r\n * Gets another `DataSnapshot` for the location at the specified relative path.\r\n *\r\n * Passing a relative path to the `child()` method of a DataSnapshot returns\r\n * another `DataSnapshot` for the location at the specified relative path. The\r\n * relative path can either be a simple child name (for example, \"ada\") or a\r\n * deeper, slash-separated path (for example, \"ada/name/first\"). If the child\r\n * location has no data, an empty `DataSnapshot` (that is, a `DataSnapshot`\r\n * whose value is `null`) is returned.\r\n *\r\n * @param path - A relative path to the location of child data.\r\n */\r\n child(path) {\r\n const childPath = new Path(path);\r\n const childRef = child(this.ref, path);\r\n return new DataSnapshot(this._node.getChild(childPath), childRef, PRIORITY_INDEX);\r\n }\r\n /**\r\n * Returns true if this `DataSnapshot` contains any data. It is slightly more\r\n * efficient than using `snapshot.val() !== null`.\r\n */\r\n exists() {\r\n return !this._node.isEmpty();\r\n }\r\n /**\r\n * Exports the entire contents of the DataSnapshot as a JavaScript object.\r\n *\r\n * The `exportVal()` method is similar to `val()`, except priority information\r\n * is included (if available), making it suitable for backing up your data.\r\n *\r\n * @returns The DataSnapshot's contents as a JavaScript value (Object,\r\n * Array, string, number, boolean, or `null`).\r\n */\r\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\r\n exportVal() {\r\n return this._node.val(true);\r\n }\r\n /**\r\n * Enumerates the top-level children in the `IteratedDataSnapshot`.\r\n *\r\n * Because of the way JavaScript objects work, the ordering of data in the\r\n * JavaScript object returned by `val()` is not guaranteed to match the\r\n * ordering on the server nor the ordering of `onChildAdded()` events. That is\r\n * where `forEach()` comes in handy. It guarantees the children of a\r\n * `DataSnapshot` will be iterated in their query order.\r\n *\r\n * If no explicit `orderBy*()` method is used, results are returned\r\n * ordered by key (unless priorities are used, in which case, results are\r\n * returned by priority).\r\n *\r\n * @param action - A function that will be called for each child DataSnapshot.\r\n * The callback can return true to cancel further enumeration.\r\n * @returns true if enumeration was canceled due to your callback returning\r\n * true.\r\n */\r\n forEach(action) {\r\n if (this._node.isLeafNode()) {\r\n return false;\r\n }\r\n const childrenNode = this._node;\r\n // Sanitize the return value to a boolean. ChildrenNode.forEachChild has a weird return type...\r\n return !!childrenNode.forEachChild(this._index, (key, node) => {\r\n return action(new DataSnapshot(node, child(this.ref, key), PRIORITY_INDEX));\r\n });\r\n }\r\n /**\r\n * Returns true if the specified child path has (non-null) data.\r\n *\r\n * @param path - A relative path to the location of a potential child.\r\n * @returns `true` if data exists at the specified child path; else\r\n * `false`.\r\n */\r\n hasChild(path) {\r\n const childPath = new Path(path);\r\n return !this._node.getChild(childPath).isEmpty();\r\n }\r\n /**\r\n * Returns whether or not the `DataSnapshot` has any non-`null` child\r\n * properties.\r\n *\r\n * You can use `hasChildren()` to determine if a `DataSnapshot` has any\r\n * children. If it does, you can enumerate them using `forEach()`. If it\r\n * doesn't, then either this snapshot contains a primitive value (which can be\r\n * retrieved with `val()`) or it is empty (in which case, `val()` will return\r\n * `null`).\r\n *\r\n * @returns true if this snapshot has any children; else false.\r\n */\r\n hasChildren() {\r\n if (this._node.isLeafNode()) {\r\n return false;\r\n }\r\n else {\r\n return !this._node.isEmpty();\r\n }\r\n }\r\n /**\r\n * Returns a JSON-serializable representation of this object.\r\n */\r\n toJSON() {\r\n return this.exportVal();\r\n }\r\n /**\r\n * Extracts a JavaScript value from a `DataSnapshot`.\r\n *\r\n * Depending on the data in a `DataSnapshot`, the `val()` method may return a\r\n * scalar type (string, number, or boolean), an array, or an object. It may\r\n * also return null, indicating that the `DataSnapshot` is empty (contains no\r\n * data).\r\n *\r\n * @returns The DataSnapshot's contents as a JavaScript value (Object,\r\n * Array, string, number, boolean, or `null`).\r\n */\r\n // eslint-disable-next-line @typescript-eslint/no-explicit-any\r\n val() {\r\n return this._node.val();\r\n }\r\n}\r\n/**\r\n *\r\n * Returns a `Reference` representing the location in the Database\r\n * corresponding to the provided path. If no path is provided, the `Reference`\r\n * will point to the root of the Database.\r\n *\r\n * @param db - The database instance to obtain a reference for.\r\n * @param path - Optional path representing the location the returned\r\n * `Reference` will point. If not provided, the returned `Reference` will\r\n * point to the root of the Database.\r\n * @returns If a path is provided, a `Reference`\r\n * pointing to the provided path. Otherwise, a `Reference` pointing to the\r\n * root of the Database.\r\n */\r\nfunction ref(db, path) {\r\n db = getModularInstance(db);\r\n db._checkNotDeleted('ref');\r\n return path !== undefined ? child(db._root, path) : db._root;\r\n}\r\n/**\r\n * Returns a `Reference` representing the location in the Database\r\n * corresponding to the provided Firebase URL.\r\n *\r\n * An exception is thrown if the URL is not a valid Firebase Database URL or it\r\n * has a different domain than the current `Database` instance.\r\n *\r\n * Note that all query parameters (`orderBy`, `limitToLast`, etc.) are ignored\r\n * and are not applied to the returned `Reference`.\r\n *\r\n * @param db - The database instance to obtain a reference for.\r\n * @param url - The Firebase URL at which the returned `Reference` will\r\n * point.\r\n * @returns A `Reference` pointing to the provided\r\n * Firebase URL.\r\n */\r\nfunction refFromURL(db, url) {\r\n db = getModularInstance(db);\r\n db._checkNotDeleted('refFromURL');\r\n const parsedURL = parseRepoInfo(url, db._repo.repoInfo_.nodeAdmin);\r\n validateUrl('refFromURL', parsedURL);\r\n const repoInfo = parsedURL.repoInfo;\r\n if (!db._repo.repoInfo_.isCustomHost() &&\r\n repoInfo.host !== db._repo.repoInfo_.host) {\r\n fatal('refFromURL' +\r\n ': Host name does not match the current database: ' +\r\n '(found ' +\r\n repoInfo.host +\r\n ' but expected ' +\r\n db._repo.repoInfo_.host +\r\n ')');\r\n }\r\n return ref(db, parsedURL.path.toString());\r\n}\r\n/**\r\n * Gets a `Reference` for the location at the specified relative path.\r\n *\r\n * The relative path can either be a simple child name (for example, \"ada\") or\r\n * a deeper slash-separated path (for example, \"ada/name/first\").\r\n *\r\n * @param parent - The parent location.\r\n * @param path - A relative path from this location to the desired child\r\n * location.\r\n * @returns The specified child location.\r\n */\r\nfunction child(parent, path) {\r\n parent = getModularInstance(parent);\r\n if (pathGetFront(parent._path) === null) {\r\n validateRootPathString('child', 'path', path, false);\r\n }\r\n else {\r\n validatePathString('child', 'path', path, false);\r\n }\r\n return new ReferenceImpl(parent._repo, pathChild(parent._path, path));\r\n}\r\n/**\r\n * Returns an `OnDisconnect` object - see\r\n * {@link https://firebase.google.com/docs/database/web/offline-capabilities | Enabling Offline Capabilities in JavaScript}\r\n * for more information on how to use it.\r\n *\r\n * @param ref - The reference to add OnDisconnect triggers for.\r\n */\r\nfunction onDisconnect(ref) {\r\n ref = getModularInstance(ref);\r\n return new OnDisconnect(ref._repo, ref._path);\r\n}\r\n/**\r\n * Generates a new child location using a unique key and returns its\r\n * `Reference`.\r\n *\r\n * This is the most common pattern for adding data to a collection of items.\r\n *\r\n * If you provide a value to `push()`, the value is written to the\r\n * generated location. If you don't pass a value, nothing is written to the\r\n * database and the child remains empty (but you can use the `Reference`\r\n * elsewhere).\r\n *\r\n * The unique keys generated by `push()` are ordered by the current time, so the\r\n * resulting list of items is chronologically sorted. The keys are also\r\n * designed to be unguessable (they contain 72 random bits of entropy).\r\n *\r\n * See {@link https://firebase.google.com/docs/database/web/lists-of-data#append_to_a_list_of_data | Append to a list of data}.\r\n * See {@link https://firebase.googleblog.com/2015/02/the-2120-ways-to-ensure-unique_68.html | The 2^120 Ways to Ensure Unique Identifiers}.\r\n *\r\n * @param parent - The parent location.\r\n * @param value - Optional value to be written at the generated location.\r\n * @returns Combined `Promise` and `Reference`; resolves when write is complete,\r\n * but can be used immediately as the `Reference` to the child location.\r\n */\r\nfunction push(parent, value) {\r\n parent = getModularInstance(parent);\r\n validateWritablePath('push', parent._path);\r\n validateFirebaseDataArg('push', value, parent._path, true);\r\n const now = repoServerTime(parent._repo);\r\n const name = nextPushId(now);\r\n // push() returns a ThennableReference whose promise is fulfilled with a\r\n // regular Reference. We use child() to create handles to two different\r\n // references. The first is turned into a ThennableReference below by adding\r\n // then() and catch() methods and is used as the return value of push(). The\r\n // second remains a regular Reference and is used as the fulfilled value of\r\n // the first ThennableReference.\r\n const thennablePushRef = child(parent, name);\r\n const pushRef = child(parent, name);\r\n let promise;\r\n if (value != null) {\r\n promise = set(pushRef, value).then(() => pushRef);\r\n }\r\n else {\r\n promise = Promise.resolve(pushRef);\r\n }\r\n thennablePushRef.then = promise.then.bind(promise);\r\n thennablePushRef.catch = promise.then.bind(promise, undefined);\r\n return thennablePushRef;\r\n}\r\n/**\r\n * Removes the data at this Database location.\r\n *\r\n * Any data at child locations will also be deleted.\r\n *\r\n * The effect of the remove will be visible immediately and the corresponding\r\n * event 'value' will be triggered. Synchronization of the remove to the\r\n * Firebase servers will also be started, and the returned Promise will resolve\r\n * when complete. If provided, the onComplete callback will be called\r\n * asynchronously after synchronization has finished.\r\n *\r\n * @param ref - The location to remove.\r\n * @returns Resolves when remove on server is complete.\r\n */\r\nfunction remove(ref) {\r\n validateWritablePath('remove', ref._path);\r\n return set(ref, null);\r\n}\r\n/**\r\n * Writes data to this Database location.\r\n *\r\n * This will overwrite any data at this location and all child locations.\r\n *\r\n * The effect of the write will be visible immediately, and the corresponding\r\n * events (\"value\", \"child_added\", etc.) will be triggered. Synchronization of\r\n * the data to the Firebase servers will also be started, and the returned\r\n * Promise will resolve when complete. If provided, the `onComplete` callback\r\n * will be called asynchronously after synchronization has finished.\r\n *\r\n * Passing `null` for the new value is equivalent to calling `remove()`; namely,\r\n * all data at this location and all child locations will be deleted.\r\n *\r\n * `set()` will remove any priority stored at this location, so if priority is\r\n * meant to be preserved, you need to use `setWithPriority()` instead.\r\n *\r\n * Note that modifying data with `set()` will cancel any pending transactions\r\n * at that location, so extreme care should be taken if mixing `set()` and\r\n * `transaction()` to modify the same data.\r\n *\r\n * A single `set()` will generate a single \"value\" event at the location where\r\n * the `set()` was performed.\r\n *\r\n * @param ref - The location to write to.\r\n * @param value - The value to be written (string, number, boolean, object,\r\n * array, or null).\r\n * @returns Resolves when write to server is complete.\r\n */\r\nfunction set(ref, value) {\r\n ref = getModularInstance(ref);\r\n validateWritablePath('set', ref._path);\r\n validateFirebaseDataArg('set', value, ref._path, false);\r\n const deferred = new Deferred();\r\n repoSetWithPriority(ref._repo, ref._path, value, \r\n /*priority=*/ null, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n}\r\n/**\r\n * Sets a priority for the data at this Database location.\r\n *\r\n * Applications need not use priority but can order collections by\r\n * ordinary properties (see\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data | Sorting and filtering data}\r\n * ).\r\n *\r\n * @param ref - The location to write to.\r\n * @param priority - The priority to be written (string, number, or null).\r\n * @returns Resolves when write to server is complete.\r\n */\r\nfunction setPriority(ref, priority) {\r\n ref = getModularInstance(ref);\r\n validateWritablePath('setPriority', ref._path);\r\n validatePriority('setPriority', priority, false);\r\n const deferred = new Deferred();\r\n repoSetWithPriority(ref._repo, pathChild(ref._path, '.priority'), priority, null, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n}\r\n/**\r\n * Writes data the Database location. Like `set()` but also specifies the\r\n * priority for that data.\r\n *\r\n * Applications need not use priority but can order collections by\r\n * ordinary properties (see\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data | Sorting and filtering data}\r\n * ).\r\n *\r\n * @param ref - The location to write to.\r\n * @param value - The value to be written (string, number, boolean, object,\r\n * array, or null).\r\n * @param priority - The priority to be written (string, number, or null).\r\n * @returns Resolves when write to server is complete.\r\n */\r\nfunction setWithPriority(ref, value, priority) {\r\n validateWritablePath('setWithPriority', ref._path);\r\n validateFirebaseDataArg('setWithPriority', value, ref._path, false);\r\n validatePriority('setWithPriority', priority, false);\r\n if (ref.key === '.length' || ref.key === '.keys') {\r\n throw 'setWithPriority failed: ' + ref.key + ' is a read-only object.';\r\n }\r\n const deferred = new Deferred();\r\n repoSetWithPriority(ref._repo, ref._path, value, priority, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n}\r\n/**\r\n * Writes multiple values to the Database at once.\r\n *\r\n * The `values` argument contains multiple property-value pairs that will be\r\n * written to the Database together. Each child property can either be a simple\r\n * property (for example, \"name\") or a relative path (for example,\r\n * \"name/first\") from the current location to the data to update.\r\n *\r\n * As opposed to the `set()` method, `update()` can be use to selectively update\r\n * only the referenced properties at the current location (instead of replacing\r\n * all the child properties at the current location).\r\n *\r\n * The effect of the write will be visible immediately, and the corresponding\r\n * events ('value', 'child_added', etc.) will be triggered. Synchronization of\r\n * the data to the Firebase servers will also be started, and the returned\r\n * Promise will resolve when complete. If provided, the `onComplete` callback\r\n * will be called asynchronously after synchronization has finished.\r\n *\r\n * A single `update()` will generate a single \"value\" event at the location\r\n * where the `update()` was performed, regardless of how many children were\r\n * modified.\r\n *\r\n * Note that modifying data with `update()` will cancel any pending\r\n * transactions at that location, so extreme care should be taken if mixing\r\n * `update()` and `transaction()` to modify the same data.\r\n *\r\n * Passing `null` to `update()` will remove the data at this location.\r\n *\r\n * See\r\n * {@link https://firebase.googleblog.com/2015/09/introducing-multi-location-updates-and_86.html | Introducing multi-location updates and more}.\r\n *\r\n * @param ref - The location to write to.\r\n * @param values - Object containing multiple values.\r\n * @returns Resolves when update on server is complete.\r\n */\r\nfunction update(ref, values) {\r\n validateFirebaseMergeDataArg('update', values, ref._path, false);\r\n const deferred = new Deferred();\r\n repoUpdate(ref._repo, ref._path, values, deferred.wrapCallback(() => { }));\r\n return deferred.promise;\r\n}\r\n/**\r\n * Gets the most up-to-date result for this query.\r\n *\r\n * @param query - The query to run.\r\n * @returns A `Promise` which resolves to the resulting DataSnapshot if a value is\r\n * available, or rejects if the client is unable to return a value (e.g., if the\r\n * server is unreachable and there is nothing cached).\r\n */\r\nfunction get(query) {\r\n query = getModularInstance(query);\r\n const callbackContext = new CallbackContext(() => { });\r\n const container = new ValueEventRegistration(callbackContext);\r\n return repoGetValue(query._repo, query, container).then(node => {\r\n return new DataSnapshot(node, new ReferenceImpl(query._repo, query._path), query._queryParams.getIndex());\r\n });\r\n}\r\n/**\r\n * Represents registration for 'value' events.\r\n */\r\nclass ValueEventRegistration {\r\n constructor(callbackContext) {\r\n this.callbackContext = callbackContext;\r\n }\r\n respondsTo(eventType) {\r\n return eventType === 'value';\r\n }\r\n createEvent(change, query) {\r\n const index = query._queryParams.getIndex();\r\n return new DataEvent('value', this, new DataSnapshot(change.snapshotNode, new ReferenceImpl(query._repo, query._path), index));\r\n }\r\n getEventRunner(eventData) {\r\n if (eventData.getEventType() === 'cancel') {\r\n return () => this.callbackContext.onCancel(eventData.error);\r\n }\r\n else {\r\n return () => this.callbackContext.onValue(eventData.snapshot, null);\r\n }\r\n }\r\n createCancelEvent(error, path) {\r\n if (this.callbackContext.hasCancelCallback) {\r\n return new CancelEvent(this, error, path);\r\n }\r\n else {\r\n return null;\r\n }\r\n }\r\n matches(other) {\r\n if (!(other instanceof ValueEventRegistration)) {\r\n return false;\r\n }\r\n else if (!other.callbackContext || !this.callbackContext) {\r\n // If no callback specified, we consider it to match any callback.\r\n return true;\r\n }\r\n else {\r\n return other.callbackContext.matches(this.callbackContext);\r\n }\r\n }\r\n hasAnyCallback() {\r\n return this.callbackContext !== null;\r\n }\r\n}\r\n/**\r\n * Represents the registration of a child_x event.\r\n */\r\nclass ChildEventRegistration {\r\n constructor(eventType, callbackContext) {\r\n this.eventType = eventType;\r\n this.callbackContext = callbackContext;\r\n }\r\n respondsTo(eventType) {\r\n let eventToCheck = eventType === 'children_added' ? 'child_added' : eventType;\r\n eventToCheck =\r\n eventToCheck === 'children_removed' ? 'child_removed' : eventToCheck;\r\n return this.eventType === eventToCheck;\r\n }\r\n createCancelEvent(error, path) {\r\n if (this.callbackContext.hasCancelCallback) {\r\n return new CancelEvent(this, error, path);\r\n }\r\n else {\r\n return null;\r\n }\r\n }\r\n createEvent(change, query) {\r\n assert(change.childName != null, 'Child events should have a childName.');\r\n const childRef = child(new ReferenceImpl(query._repo, query._path), change.childName);\r\n const index = query._queryParams.getIndex();\r\n return new DataEvent(change.type, this, new DataSnapshot(change.snapshotNode, childRef, index), change.prevName);\r\n }\r\n getEventRunner(eventData) {\r\n if (eventData.getEventType() === 'cancel') {\r\n return () => this.callbackContext.onCancel(eventData.error);\r\n }\r\n else {\r\n return () => this.callbackContext.onValue(eventData.snapshot, eventData.prevName);\r\n }\r\n }\r\n matches(other) {\r\n if (other instanceof ChildEventRegistration) {\r\n return (this.eventType === other.eventType &&\r\n (!this.callbackContext ||\r\n !other.callbackContext ||\r\n this.callbackContext.matches(other.callbackContext)));\r\n }\r\n return false;\r\n }\r\n hasAnyCallback() {\r\n return !!this.callbackContext;\r\n }\r\n}\r\nfunction addEventListener(query, eventType, callback, cancelCallbackOrListenOptions, options) {\r\n let cancelCallback;\r\n if (typeof cancelCallbackOrListenOptions === 'object') {\r\n cancelCallback = undefined;\r\n options = cancelCallbackOrListenOptions;\r\n }\r\n if (typeof cancelCallbackOrListenOptions === 'function') {\r\n cancelCallback = cancelCallbackOrListenOptions;\r\n }\r\n if (options && options.onlyOnce) {\r\n const userCallback = callback;\r\n const onceCallback = (dataSnapshot, previousChildName) => {\r\n repoRemoveEventCallbackForQuery(query._repo, query, container);\r\n userCallback(dataSnapshot, previousChildName);\r\n };\r\n onceCallback.userCallback = callback.userCallback;\r\n onceCallback.context = callback.context;\r\n callback = onceCallback;\r\n }\r\n const callbackContext = new CallbackContext(callback, cancelCallback || undefined);\r\n const container = eventType === 'value'\r\n ? new ValueEventRegistration(callbackContext)\r\n : new ChildEventRegistration(eventType, callbackContext);\r\n repoAddEventCallbackForQuery(query._repo, query, container);\r\n return () => repoRemoveEventCallbackForQuery(query._repo, query, container);\r\n}\r\nfunction onValue(query, callback, cancelCallbackOrListenOptions, options) {\r\n return addEventListener(query, 'value', callback, cancelCallbackOrListenOptions, options);\r\n}\r\nfunction onChildAdded(query, callback, cancelCallbackOrListenOptions, options) {\r\n return addEventListener(query, 'child_added', callback, cancelCallbackOrListenOptions, options);\r\n}\r\nfunction onChildChanged(query, callback, cancelCallbackOrListenOptions, options) {\r\n return addEventListener(query, 'child_changed', callback, cancelCallbackOrListenOptions, options);\r\n}\r\nfunction onChildMoved(query, callback, cancelCallbackOrListenOptions, options) {\r\n return addEventListener(query, 'child_moved', callback, cancelCallbackOrListenOptions, options);\r\n}\r\nfunction onChildRemoved(query, callback, cancelCallbackOrListenOptions, options) {\r\n return addEventListener(query, 'child_removed', callback, cancelCallbackOrListenOptions, options);\r\n}\r\n/**\r\n * Detaches a callback previously attached with the corresponding `on*()` (`onValue`, `onChildAdded`) listener.\r\n * Note: This is not the recommended way to remove a listener. Instead, please use the returned callback function from\r\n * the respective `on*` callbacks.\r\n *\r\n * Detach a callback previously attached with `on*()`. Calling `off()` on a parent listener\r\n * will not automatically remove listeners registered on child nodes, `off()`\r\n * must also be called on any child listeners to remove the callback.\r\n *\r\n * If a callback is not specified, all callbacks for the specified eventType\r\n * will be removed. Similarly, if no eventType is specified, all callbacks\r\n * for the `Reference` will be removed.\r\n *\r\n * Individual listeners can also be removed by invoking their unsubscribe\r\n * callbacks.\r\n *\r\n * @param query - The query that the listener was registered with.\r\n * @param eventType - One of the following strings: \"value\", \"child_added\",\r\n * \"child_changed\", \"child_removed\", or \"child_moved.\" If omitted, all callbacks\r\n * for the `Reference` will be removed.\r\n * @param callback - The callback function that was passed to `on()` or\r\n * `undefined` to remove all callbacks.\r\n */\r\nfunction off(query, eventType, callback) {\r\n let container = null;\r\n const expCallback = callback ? new CallbackContext(callback) : null;\r\n if (eventType === 'value') {\r\n container = new ValueEventRegistration(expCallback);\r\n }\r\n else if (eventType) {\r\n container = new ChildEventRegistration(eventType, expCallback);\r\n }\r\n repoRemoveEventCallbackForQuery(query._repo, query, container);\r\n}\r\n/**\r\n * A `QueryConstraint` is used to narrow the set of documents returned by a\r\n * Database query. `QueryConstraint`s are created by invoking {@link endAt},\r\n * {@link endBefore}, {@link startAt}, {@link startAfter}, {@link\r\n * limitToFirst}, {@link limitToLast}, {@link orderByChild},\r\n * {@link orderByChild}, {@link orderByKey} , {@link orderByPriority} ,\r\n * {@link orderByValue} or {@link equalTo} and\r\n * can then be passed to {@link query} to create a new query instance that\r\n * also contains this `QueryConstraint`.\r\n */\r\nclass QueryConstraint {\r\n}\r\nclass QueryEndAtConstraint extends QueryConstraint {\r\n constructor(_value, _key) {\r\n super();\r\n this._value = _value;\r\n this._key = _key;\r\n }\r\n _apply(query) {\r\n validateFirebaseDataArg('endAt', this._value, query._path, true);\r\n const newParams = queryParamsEndAt(query._queryParams, this._value, this._key);\r\n validateLimit(newParams);\r\n validateQueryEndpoints(newParams);\r\n if (query._queryParams.hasEnd()) {\r\n throw new Error('endAt: Starting point was already set (by another call to endAt, ' +\r\n 'endBefore or equalTo).');\r\n }\r\n return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);\r\n }\r\n}\r\n/**\r\n * Creates a `QueryConstraint` with the specified ending point.\r\n *\r\n * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`\r\n * allows you to choose arbitrary starting and ending points for your queries.\r\n *\r\n * The ending point is inclusive, so children with exactly the specified value\r\n * will be included in the query. The optional key argument can be used to\r\n * further limit the range of the query. If it is specified, then children that\r\n * have exactly the specified value must also have a key name less than or equal\r\n * to the specified key.\r\n *\r\n * You can read more about `endAt()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.\r\n *\r\n * @param value - The value to end at. The argument type depends on which\r\n * `orderBy*()` function was used in this query. Specify a value that matches\r\n * the `orderBy*()` type. When used in combination with `orderByKey()`, the\r\n * value must be a string.\r\n * @param key - The child key to end at, among the children with the previously\r\n * specified priority. This argument is only allowed if ordering by child,\r\n * value, or priority.\r\n */\r\nfunction endAt(value, key) {\r\n validateKey('endAt', 'key', key, true);\r\n return new QueryEndAtConstraint(value, key);\r\n}\r\nclass QueryEndBeforeConstraint extends QueryConstraint {\r\n constructor(_value, _key) {\r\n super();\r\n this._value = _value;\r\n this._key = _key;\r\n }\r\n _apply(query) {\r\n validateFirebaseDataArg('endBefore', this._value, query._path, false);\r\n const newParams = queryParamsEndBefore(query._queryParams, this._value, this._key);\r\n validateLimit(newParams);\r\n validateQueryEndpoints(newParams);\r\n if (query._queryParams.hasEnd()) {\r\n throw new Error('endBefore: Starting point was already set (by another call to endAt, ' +\r\n 'endBefore or equalTo).');\r\n }\r\n return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);\r\n }\r\n}\r\n/**\r\n * Creates a `QueryConstraint` with the specified ending point (exclusive).\r\n *\r\n * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`\r\n * allows you to choose arbitrary starting and ending points for your queries.\r\n *\r\n * The ending point is exclusive. If only a value is provided, children\r\n * with a value less than the specified value will be included in the query.\r\n * If a key is specified, then children must have a value less than or equal\r\n * to the specified value and a key name less than the specified key.\r\n *\r\n * @param value - The value to end before. The argument type depends on which\r\n * `orderBy*()` function was used in this query. Specify a value that matches\r\n * the `orderBy*()` type. When used in combination with `orderByKey()`, the\r\n * value must be a string.\r\n * @param key - The child key to end before, among the children with the\r\n * previously specified priority. This argument is only allowed if ordering by\r\n * child, value, or priority.\r\n */\r\nfunction endBefore(value, key) {\r\n validateKey('endBefore', 'key', key, true);\r\n return new QueryEndBeforeConstraint(value, key);\r\n}\r\nclass QueryStartAtConstraint extends QueryConstraint {\r\n constructor(_value, _key) {\r\n super();\r\n this._value = _value;\r\n this._key = _key;\r\n }\r\n _apply(query) {\r\n validateFirebaseDataArg('startAt', this._value, query._path, true);\r\n const newParams = queryParamsStartAt(query._queryParams, this._value, this._key);\r\n validateLimit(newParams);\r\n validateQueryEndpoints(newParams);\r\n if (query._queryParams.hasStart()) {\r\n throw new Error('startAt: Starting point was already set (by another call to startAt, ' +\r\n 'startBefore or equalTo).');\r\n }\r\n return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);\r\n }\r\n}\r\n/**\r\n * Creates a `QueryConstraint` with the specified starting point.\r\n *\r\n * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`\r\n * allows you to choose arbitrary starting and ending points for your queries.\r\n *\r\n * The starting point is inclusive, so children with exactly the specified value\r\n * will be included in the query. The optional key argument can be used to\r\n * further limit the range of the query. If it is specified, then children that\r\n * have exactly the specified value must also have a key name greater than or\r\n * equal to the specified key.\r\n *\r\n * You can read more about `startAt()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.\r\n *\r\n * @param value - The value to start at. The argument type depends on which\r\n * `orderBy*()` function was used in this query. Specify a value that matches\r\n * the `orderBy*()` type. When used in combination with `orderByKey()`, the\r\n * value must be a string.\r\n * @param key - The child key to start at. This argument is only allowed if\r\n * ordering by child, value, or priority.\r\n */\r\nfunction startAt(value = null, key) {\r\n validateKey('startAt', 'key', key, true);\r\n return new QueryStartAtConstraint(value, key);\r\n}\r\nclass QueryStartAfterConstraint extends QueryConstraint {\r\n constructor(_value, _key) {\r\n super();\r\n this._value = _value;\r\n this._key = _key;\r\n }\r\n _apply(query) {\r\n validateFirebaseDataArg('startAfter', this._value, query._path, false);\r\n const newParams = queryParamsStartAfter(query._queryParams, this._value, this._key);\r\n validateLimit(newParams);\r\n validateQueryEndpoints(newParams);\r\n if (query._queryParams.hasStart()) {\r\n throw new Error('startAfter: Starting point was already set (by another call to startAt, ' +\r\n 'startAfter, or equalTo).');\r\n }\r\n return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);\r\n }\r\n}\r\n/**\r\n * Creates a `QueryConstraint` with the specified starting point (exclusive).\r\n *\r\n * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`\r\n * allows you to choose arbitrary starting and ending points for your queries.\r\n *\r\n * The starting point is exclusive. If only a value is provided, children\r\n * with a value greater than the specified value will be included in the query.\r\n * If a key is specified, then children must have a value greater than or equal\r\n * to the specified value and a a key name greater than the specified key.\r\n *\r\n * @param value - The value to start after. The argument type depends on which\r\n * `orderBy*()` function was used in this query. Specify a value that matches\r\n * the `orderBy*()` type. When used in combination with `orderByKey()`, the\r\n * value must be a string.\r\n * @param key - The child key to start after. This argument is only allowed if\r\n * ordering by child, value, or priority.\r\n */\r\nfunction startAfter(value, key) {\r\n validateKey('startAfter', 'key', key, true);\r\n return new QueryStartAfterConstraint(value, key);\r\n}\r\nclass QueryLimitToFirstConstraint extends QueryConstraint {\r\n constructor(_limit) {\r\n super();\r\n this._limit = _limit;\r\n }\r\n _apply(query) {\r\n if (query._queryParams.hasLimit()) {\r\n throw new Error('limitToFirst: Limit was already set (by another call to limitToFirst ' +\r\n 'or limitToLast).');\r\n }\r\n return new QueryImpl(query._repo, query._path, queryParamsLimitToFirst(query._queryParams, this._limit), query._orderByCalled);\r\n }\r\n}\r\n/**\r\n * Creates a new `QueryConstraint` that if limited to the first specific number\r\n * of children.\r\n *\r\n * The `limitToFirst()` method is used to set a maximum number of children to be\r\n * synced for a given callback. If we set a limit of 100, we will initially only\r\n * receive up to 100 `child_added` events. If we have fewer than 100 messages\r\n * stored in our Database, a `child_added` event will fire for each message.\r\n * However, if we have over 100 messages, we will only receive a `child_added`\r\n * event for the first 100 ordered messages. As items change, we will receive\r\n * `child_removed` events for each item that drops out of the active list so\r\n * that the total number stays at 100.\r\n *\r\n * You can read more about `limitToFirst()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.\r\n *\r\n * @param limit - The maximum number of nodes to include in this query.\r\n */\r\nfunction limitToFirst(limit) {\r\n if (typeof limit !== 'number' || Math.floor(limit) !== limit || limit <= 0) {\r\n throw new Error('limitToFirst: First argument must be a positive integer.');\r\n }\r\n return new QueryLimitToFirstConstraint(limit);\r\n}\r\nclass QueryLimitToLastConstraint extends QueryConstraint {\r\n constructor(_limit) {\r\n super();\r\n this._limit = _limit;\r\n }\r\n _apply(query) {\r\n if (query._queryParams.hasLimit()) {\r\n throw new Error('limitToLast: Limit was already set (by another call to limitToFirst ' +\r\n 'or limitToLast).');\r\n }\r\n return new QueryImpl(query._repo, query._path, queryParamsLimitToLast(query._queryParams, this._limit), query._orderByCalled);\r\n }\r\n}\r\n/**\r\n * Creates a new `QueryConstraint` that is limited to return only the last\r\n * specified number of children.\r\n *\r\n * The `limitToLast()` method is used to set a maximum number of children to be\r\n * synced for a given callback. If we set a limit of 100, we will initially only\r\n * receive up to 100 `child_added` events. If we have fewer than 100 messages\r\n * stored in our Database, a `child_added` event will fire for each message.\r\n * However, if we have over 100 messages, we will only receive a `child_added`\r\n * event for the last 100 ordered messages. As items change, we will receive\r\n * `child_removed` events for each item that drops out of the active list so\r\n * that the total number stays at 100.\r\n *\r\n * You can read more about `limitToLast()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.\r\n *\r\n * @param limit - The maximum number of nodes to include in this query.\r\n */\r\nfunction limitToLast(limit) {\r\n if (typeof limit !== 'number' || Math.floor(limit) !== limit || limit <= 0) {\r\n throw new Error('limitToLast: First argument must be a positive integer.');\r\n }\r\n return new QueryLimitToLastConstraint(limit);\r\n}\r\nclass QueryOrderByChildConstraint extends QueryConstraint {\r\n constructor(_path) {\r\n super();\r\n this._path = _path;\r\n }\r\n _apply(query) {\r\n validateNoPreviousOrderByCall(query, 'orderByChild');\r\n const parsedPath = new Path(this._path);\r\n if (pathIsEmpty(parsedPath)) {\r\n throw new Error('orderByChild: cannot pass in empty path. Use orderByValue() instead.');\r\n }\r\n const index = new PathIndex(parsedPath);\r\n const newParams = queryParamsOrderBy(query._queryParams, index);\r\n validateQueryEndpoints(newParams);\r\n return new QueryImpl(query._repo, query._path, newParams, \r\n /*orderByCalled=*/ true);\r\n }\r\n}\r\n/**\r\n * Creates a new `QueryConstraint` that orders by the specified child key.\r\n *\r\n * Queries can only order by one key at a time. Calling `orderByChild()`\r\n * multiple times on the same query is an error.\r\n *\r\n * Firebase queries allow you to order your data by any child key on the fly.\r\n * However, if you know in advance what your indexes will be, you can define\r\n * them via the .indexOn rule in your Security Rules for better performance. See\r\n * the{@link https://firebase.google.com/docs/database/security/indexing-data}\r\n * rule for more information.\r\n *\r\n * You can read more about `orderByChild()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}.\r\n *\r\n * @param path - The path to order by.\r\n */\r\nfunction orderByChild(path) {\r\n if (path === '$key') {\r\n throw new Error('orderByChild: \"$key\" is invalid. Use orderByKey() instead.');\r\n }\r\n else if (path === '$priority') {\r\n throw new Error('orderByChild: \"$priority\" is invalid. Use orderByPriority() instead.');\r\n }\r\n else if (path === '$value') {\r\n throw new Error('orderByChild: \"$value\" is invalid. Use orderByValue() instead.');\r\n }\r\n validatePathString('orderByChild', 'path', path, false);\r\n return new QueryOrderByChildConstraint(path);\r\n}\r\nclass QueryOrderByKeyConstraint extends QueryConstraint {\r\n _apply(query) {\r\n validateNoPreviousOrderByCall(query, 'orderByKey');\r\n const newParams = queryParamsOrderBy(query._queryParams, KEY_INDEX);\r\n validateQueryEndpoints(newParams);\r\n return new QueryImpl(query._repo, query._path, newParams, \r\n /*orderByCalled=*/ true);\r\n }\r\n}\r\n/**\r\n * Creates a new `QueryConstraint` that orders by the key.\r\n *\r\n * Sorts the results of a query by their (ascending) key values.\r\n *\r\n * You can read more about `orderByKey()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}.\r\n */\r\nfunction orderByKey() {\r\n return new QueryOrderByKeyConstraint();\r\n}\r\nclass QueryOrderByPriorityConstraint extends QueryConstraint {\r\n _apply(query) {\r\n validateNoPreviousOrderByCall(query, 'orderByPriority');\r\n const newParams = queryParamsOrderBy(query._queryParams, PRIORITY_INDEX);\r\n validateQueryEndpoints(newParams);\r\n return new QueryImpl(query._repo, query._path, newParams, \r\n /*orderByCalled=*/ true);\r\n }\r\n}\r\n/**\r\n * Creates a new `QueryConstraint` that orders by priority.\r\n *\r\n * Applications need not use priority but can order collections by\r\n * ordinary properties (see\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}\r\n * for alternatives to priority.\r\n */\r\nfunction orderByPriority() {\r\n return new QueryOrderByPriorityConstraint();\r\n}\r\nclass QueryOrderByValueConstraint extends QueryConstraint {\r\n _apply(query) {\r\n validateNoPreviousOrderByCall(query, 'orderByValue');\r\n const newParams = queryParamsOrderBy(query._queryParams, VALUE_INDEX);\r\n validateQueryEndpoints(newParams);\r\n return new QueryImpl(query._repo, query._path, newParams, \r\n /*orderByCalled=*/ true);\r\n }\r\n}\r\n/**\r\n * Creates a new `QueryConstraint` that orders by value.\r\n *\r\n * If the children of a query are all scalar values (string, number, or\r\n * boolean), you can order the results by their (ascending) values.\r\n *\r\n * You can read more about `orderByValue()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}.\r\n */\r\nfunction orderByValue() {\r\n return new QueryOrderByValueConstraint();\r\n}\r\nclass QueryEqualToValueConstraint extends QueryConstraint {\r\n constructor(_value, _key) {\r\n super();\r\n this._value = _value;\r\n this._key = _key;\r\n }\r\n _apply(query) {\r\n validateFirebaseDataArg('equalTo', this._value, query._path, false);\r\n if (query._queryParams.hasStart()) {\r\n throw new Error('equalTo: Starting point was already set (by another call to startAt/startAfter or ' +\r\n 'equalTo).');\r\n }\r\n if (query._queryParams.hasEnd()) {\r\n throw new Error('equalTo: Ending point was already set (by another call to endAt/endBefore or ' +\r\n 'equalTo).');\r\n }\r\n return new QueryEndAtConstraint(this._value, this._key)._apply(new QueryStartAtConstraint(this._value, this._key)._apply(query));\r\n }\r\n}\r\n/**\r\n * Creates a `QueryConstraint` that includes children that match the specified\r\n * value.\r\n *\r\n * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`\r\n * allows you to choose arbitrary starting and ending points for your queries.\r\n *\r\n * The optional key argument can be used to further limit the range of the\r\n * query. If it is specified, then children that have exactly the specified\r\n * value must also have exactly the specified key as their key name. This can be\r\n * used to filter result sets with many matches for the same value.\r\n *\r\n * You can read more about `equalTo()` in\r\n * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.\r\n *\r\n * @param value - The value to match for. The argument type depends on which\r\n * `orderBy*()` function was used in this query. Specify a value that matches\r\n * the `orderBy*()` type. When used in combination with `orderByKey()`, the\r\n * value must be a string.\r\n * @param key - The child key to start at, among the children with the\r\n * previously specified priority. This argument is only allowed if ordering by\r\n * child, value, or priority.\r\n */\r\nfunction equalTo(value, key) {\r\n validateKey('equalTo', 'key', key, true);\r\n return new QueryEqualToValueConstraint(value, key);\r\n}\r\n/**\r\n * Creates a new immutable instance of `Query` that is extended to also include\r\n * additional query constraints.\r\n *\r\n * @param query - The Query instance to use as a base for the new constraints.\r\n * @param queryConstraints - The list of `QueryConstraint`s to apply.\r\n * @throws if any of the provided query constraints cannot be combined with the\r\n * existing or new constraints.\r\n */\r\nfunction query(query, ...queryConstraints) {\r\n let queryImpl = getModularInstance(query);\r\n for (const constraint of queryConstraints) {\r\n queryImpl = constraint._apply(queryImpl);\r\n }\r\n return queryImpl;\r\n}\r\n/**\r\n * Define reference constructor in various modules\r\n *\r\n * We are doing this here to avoid several circular\r\n * dependency issues\r\n */\r\nsyncPointSetReferenceConstructor(ReferenceImpl);\r\nsyncTreeSetReferenceConstructor(ReferenceImpl);\n\n/**\r\n * @license\r\n * Copyright 2020 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * This variable is also defined in the firebase Node.js Admin SDK. Before\r\n * modifying this definition, consult the definition in:\r\n *\r\n * https://github.com/firebase/firebase-admin-node\r\n *\r\n * and make sure the two are consistent.\r\n */\r\nconst FIREBASE_DATABASE_EMULATOR_HOST_VAR = 'FIREBASE_DATABASE_EMULATOR_HOST';\r\n/**\r\n * Creates and caches `Repo` instances.\r\n */\r\nconst repos = {};\r\n/**\r\n * If true, any new `Repo` will be created to use `ReadonlyRestClient` (for testing purposes).\r\n */\r\nlet useRestClient = false;\r\n/**\r\n * Update an existing `Repo` in place to point to a new host/port.\r\n */\r\nfunction repoManagerApplyEmulatorSettings(repo, host, port, tokenProvider) {\r\n repo.repoInfo_ = new RepoInfo(`${host}:${port}`, \r\n /* secure= */ false, repo.repoInfo_.namespace, repo.repoInfo_.webSocketOnly, repo.repoInfo_.nodeAdmin, repo.repoInfo_.persistenceKey, repo.repoInfo_.includeNamespaceInQueryParams, \r\n /*isUsingEmulator=*/ true);\r\n if (tokenProvider) {\r\n repo.authTokenProvider_ = tokenProvider;\r\n }\r\n}\r\n/**\r\n * This function should only ever be called to CREATE a new database instance.\r\n * @internal\r\n */\r\nfunction repoManagerDatabaseFromApp(app, authProvider, appCheckProvider, url, nodeAdmin) {\r\n let dbUrl = url || app.options.databaseURL;\r\n if (dbUrl === undefined) {\r\n if (!app.options.projectId) {\r\n fatal(\"Can't determine Firebase Database URL. Be sure to include \" +\r\n ' a Project ID when calling firebase.initializeApp().');\r\n }\r\n log('Using default host for project ', app.options.projectId);\r\n dbUrl = `${app.options.projectId}-default-rtdb.firebaseio.com`;\r\n }\r\n let parsedUrl = parseRepoInfo(dbUrl, nodeAdmin);\r\n let repoInfo = parsedUrl.repoInfo;\r\n let isEmulator;\r\n let dbEmulatorHost = undefined;\r\n if (typeof process !== 'undefined' && process.env) {\r\n dbEmulatorHost = process.env[FIREBASE_DATABASE_EMULATOR_HOST_VAR];\r\n }\r\n if (dbEmulatorHost) {\r\n isEmulator = true;\r\n dbUrl = `http://${dbEmulatorHost}?ns=${repoInfo.namespace}`;\r\n parsedUrl = parseRepoInfo(dbUrl, nodeAdmin);\r\n repoInfo = parsedUrl.repoInfo;\r\n }\r\n else {\r\n isEmulator = !parsedUrl.repoInfo.secure;\r\n }\r\n const authTokenProvider = nodeAdmin && isEmulator\r\n ? new EmulatorTokenProvider(EmulatorTokenProvider.OWNER)\r\n : new FirebaseAuthTokenProvider(app.name, app.options, authProvider);\r\n validateUrl('Invalid Firebase Database URL', parsedUrl);\r\n if (!pathIsEmpty(parsedUrl.path)) {\r\n fatal('Database URL must point to the root of a Firebase Database ' +\r\n '(not including a child path).');\r\n }\r\n const repo = repoManagerCreateRepo(repoInfo, app, authTokenProvider, new AppCheckTokenProvider(app.name, appCheckProvider));\r\n return new Database(repo, app);\r\n}\r\n/**\r\n * Remove the repo and make sure it is disconnected.\r\n *\r\n */\r\nfunction repoManagerDeleteRepo(repo, appName) {\r\n const appRepos = repos[appName];\r\n // This should never happen...\r\n if (!appRepos || appRepos[repo.key] !== repo) {\r\n fatal(`Database ${appName}(${repo.repoInfo_}) has already been deleted.`);\r\n }\r\n repoInterrupt(repo);\r\n delete appRepos[repo.key];\r\n}\r\n/**\r\n * Ensures a repo doesn't already exist and then creates one using the\r\n * provided app.\r\n *\r\n * @param repoInfo - The metadata about the Repo\r\n * @returns The Repo object for the specified server / repoName.\r\n */\r\nfunction repoManagerCreateRepo(repoInfo, app, authTokenProvider, appCheckProvider) {\r\n let appRepos = repos[app.name];\r\n if (!appRepos) {\r\n appRepos = {};\r\n repos[app.name] = appRepos;\r\n }\r\n let repo = appRepos[repoInfo.toURLString()];\r\n if (repo) {\r\n fatal('Database initialized multiple times. Please make sure the format of the database URL matches with each database() call.');\r\n }\r\n repo = new Repo(repoInfo, useRestClient, authTokenProvider, appCheckProvider);\r\n appRepos[repoInfo.toURLString()] = repo;\r\n return repo;\r\n}\r\n/**\r\n * Forces us to use ReadonlyRestClient instead of PersistentConnection for new Repos.\r\n */\r\nfunction repoManagerForceRestClient(forceRestClient) {\r\n useRestClient = forceRestClient;\r\n}\r\n/**\r\n * Class representing a Firebase Realtime Database.\r\n */\r\nclass Database {\r\n /** @hideconstructor */\r\n constructor(_repoInternal, \r\n /** The {@link @firebase/app#FirebaseApp} associated with this Realtime Database instance. */\r\n app) {\r\n this._repoInternal = _repoInternal;\r\n this.app = app;\r\n /** Represents a `Database` instance. */\r\n this['type'] = 'database';\r\n /** Track if the instance has been used (root or repo accessed) */\r\n this._instanceStarted = false;\r\n }\r\n get _repo() {\r\n if (!this._instanceStarted) {\r\n repoStart(this._repoInternal, this.app.options.appId, this.app.options['databaseAuthVariableOverride']);\r\n this._instanceStarted = true;\r\n }\r\n return this._repoInternal;\r\n }\r\n get _root() {\r\n if (!this._rootInternal) {\r\n this._rootInternal = new ReferenceImpl(this._repo, newEmptyPath());\r\n }\r\n return this._rootInternal;\r\n }\r\n _delete() {\r\n if (this._rootInternal !== null) {\r\n repoManagerDeleteRepo(this._repo, this.app.name);\r\n this._repoInternal = null;\r\n this._rootInternal = null;\r\n }\r\n return Promise.resolve();\r\n }\r\n _checkNotDeleted(apiName) {\r\n if (this._rootInternal === null) {\r\n fatal('Cannot call ' + apiName + ' on a deleted database.');\r\n }\r\n }\r\n}\r\nfunction checkTransportInit() {\r\n if (TransportManager.IS_TRANSPORT_INITIALIZED) {\r\n warn('Transport has already been initialized. Please call this function before calling ref or setting up a listener');\r\n }\r\n}\r\n/**\r\n * Force the use of websockets instead of longPolling.\r\n */\r\nfunction forceWebSockets() {\r\n checkTransportInit();\r\n BrowserPollConnection.forceDisallow();\r\n}\r\n/**\r\n * Force the use of longPolling instead of websockets. This will be ignored if websocket protocol is used in databaseURL.\r\n */\r\nfunction forceLongPolling() {\r\n checkTransportInit();\r\n WebSocketConnection.forceDisallow();\r\n BrowserPollConnection.forceAllow();\r\n}\r\n/**\r\n * Returns the instance of the Realtime Database SDK that is associated\r\n * with the provided {@link @firebase/app#FirebaseApp}. Initializes a new instance with\r\n * with default settings if no instance exists or if the existing instance uses\r\n * a custom database URL.\r\n *\r\n * @param app - The {@link @firebase/app#FirebaseApp} instance that the returned Realtime\r\n * Database instance is associated with.\r\n * @param url - The URL of the Realtime Database instance to connect to. If not\r\n * provided, the SDK connects to the default instance of the Firebase App.\r\n * @returns The `Database` instance of the provided app.\r\n */\r\nfunction getDatabase(app = getApp(), url) {\r\n const db = _getProvider(app, 'database').getImmediate({\r\n identifier: url\r\n });\r\n if (!db._instanceStarted) {\r\n const emulator = getDefaultEmulatorHostnameAndPort('database');\r\n if (emulator) {\r\n connectDatabaseEmulator(db, ...emulator);\r\n }\r\n }\r\n return db;\r\n}\r\n/**\r\n * Modify the provided instance to communicate with the Realtime Database\r\n * emulator.\r\n *\r\n * Note: This method must be called before performing any other operation.\r\n *\r\n * @param db - The instance to modify.\r\n * @param host - The emulator host (ex: localhost)\r\n * @param port - The emulator port (ex: 8080)\r\n * @param options.mockUserToken - the mock auth token to use for unit testing Security Rules\r\n */\r\nfunction connectDatabaseEmulator(db, host, port, options = {}) {\r\n db = getModularInstance(db);\r\n db._checkNotDeleted('useEmulator');\r\n if (db._instanceStarted) {\r\n fatal('Cannot call useEmulator() after instance has already been initialized.');\r\n }\r\n const repo = db._repoInternal;\r\n let tokenProvider = undefined;\r\n if (repo.repoInfo_.nodeAdmin) {\r\n if (options.mockUserToken) {\r\n fatal('mockUserToken is not supported by the Admin SDK. For client access with mock users, please use the \"firebase\" package instead of \"firebase-admin\".');\r\n }\r\n tokenProvider = new EmulatorTokenProvider(EmulatorTokenProvider.OWNER);\r\n }\r\n else if (options.mockUserToken) {\r\n const token = typeof options.mockUserToken === 'string'\r\n ? options.mockUserToken\r\n : createMockUserToken(options.mockUserToken, db.app.options.projectId);\r\n tokenProvider = new EmulatorTokenProvider(token);\r\n }\r\n // Modify the repo to apply emulator settings\r\n repoManagerApplyEmulatorSettings(repo, host, port, tokenProvider);\r\n}\r\n/**\r\n * Disconnects from the server (all Database operations will be completed\r\n * offline).\r\n *\r\n * The client automatically maintains a persistent connection to the Database\r\n * server, which will remain active indefinitely and reconnect when\r\n * disconnected. However, the `goOffline()` and `goOnline()` methods may be used\r\n * to control the client connection in cases where a persistent connection is\r\n * undesirable.\r\n *\r\n * While offline, the client will no longer receive data updates from the\r\n * Database. However, all Database operations performed locally will continue to\r\n * immediately fire events, allowing your application to continue behaving\r\n * normally. Additionally, each operation performed locally will automatically\r\n * be queued and retried upon reconnection to the Database server.\r\n *\r\n * To reconnect to the Database and begin receiving remote events, see\r\n * `goOnline()`.\r\n *\r\n * @param db - The instance to disconnect.\r\n */\r\nfunction goOffline(db) {\r\n db = getModularInstance(db);\r\n db._checkNotDeleted('goOffline');\r\n repoInterrupt(db._repo);\r\n}\r\n/**\r\n * Reconnects to the server and synchronizes the offline Database state\r\n * with the server state.\r\n *\r\n * This method should be used after disabling the active connection with\r\n * `goOffline()`. Once reconnected, the client will transmit the proper data\r\n * and fire the appropriate events so that your client \"catches up\"\r\n * automatically.\r\n *\r\n * @param db - The instance to reconnect.\r\n */\r\nfunction goOnline(db) {\r\n db = getModularInstance(db);\r\n db._checkNotDeleted('goOnline');\r\n repoResume(db._repo);\r\n}\r\nfunction enableLogging(logger, persistent) {\r\n enableLogging$1(logger, persistent);\r\n}\n\n/**\r\n * @license\r\n * Copyright 2021 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\nfunction registerDatabase(variant) {\r\n setSDKVersion(SDK_VERSION$1);\r\n _registerComponent(new Component('database', (container, { instanceIdentifier: url }) => {\r\n const app = container.getProvider('app').getImmediate();\r\n const authProvider = container.getProvider('auth-internal');\r\n const appCheckProvider = container.getProvider('app-check-internal');\r\n return repoManagerDatabaseFromApp(app, authProvider, appCheckProvider, url);\r\n }, \"PUBLIC\" /* ComponentType.PUBLIC */).setMultipleInstances(true));\r\n registerVersion(name, version, variant);\r\n // BUILD_TARGET will be replaced by values like esm5, esm2017, cjs5, etc during the compilation\r\n registerVersion(name, version, 'esm2017');\r\n}\n\n/**\r\n * @license\r\n * Copyright 2020 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\nconst SERVER_TIMESTAMP = {\r\n '.sv': 'timestamp'\r\n};\r\n/**\r\n * Returns a placeholder value for auto-populating the current timestamp (time\r\n * since the Unix epoch, in milliseconds) as determined by the Firebase\r\n * servers.\r\n */\r\nfunction serverTimestamp() {\r\n return SERVER_TIMESTAMP;\r\n}\r\n/**\r\n * Returns a placeholder value that can be used to atomically increment the\r\n * current database value by the provided delta.\r\n *\r\n * @param delta - the amount to modify the current value atomically.\r\n * @returns A placeholder value for modifying data atomically server-side.\r\n */\r\nfunction increment(delta) {\r\n return {\r\n '.sv': {\r\n 'increment': delta\r\n }\r\n };\r\n}\n\n/**\r\n * @license\r\n * Copyright 2020 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * A type for the resolve value of {@link runTransaction}.\r\n */\r\nclass TransactionResult {\r\n /** @hideconstructor */\r\n constructor(\r\n /** Whether the transaction was successfully committed. */\r\n committed, \r\n /** The resulting data snapshot. */\r\n snapshot) {\r\n this.committed = committed;\r\n this.snapshot = snapshot;\r\n }\r\n /** Returns a JSON-serializable representation of this object. */\r\n toJSON() {\r\n return { committed: this.committed, snapshot: this.snapshot.toJSON() };\r\n }\r\n}\r\n/**\r\n * Atomically modifies the data at this location.\r\n *\r\n * Atomically modify the data at this location. Unlike a normal `set()`, which\r\n * just overwrites the data regardless of its previous value, `runTransaction()` is\r\n * used to modify the existing value to a new value, ensuring there are no\r\n * conflicts with other clients writing to the same location at the same time.\r\n *\r\n * To accomplish this, you pass `runTransaction()` an update function which is\r\n * used to transform the current value into a new value. If another client\r\n * writes to the location before your new value is successfully written, your\r\n * update function will be called again with the new current value, and the\r\n * write will be retried. This will happen repeatedly until your write succeeds\r\n * without conflict or you abort the transaction by not returning a value from\r\n * your update function.\r\n *\r\n * Note: Modifying data with `set()` will cancel any pending transactions at\r\n * that location, so extreme care should be taken if mixing `set()` and\r\n * `runTransaction()` to update the same data.\r\n *\r\n * Note: When using transactions with Security and Firebase Rules in place, be\r\n * aware that a client needs `.read` access in addition to `.write` access in\r\n * order to perform a transaction. This is because the client-side nature of\r\n * transactions requires the client to read the data in order to transactionally\r\n * update it.\r\n *\r\n * @param ref - The location to atomically modify.\r\n * @param transactionUpdate - A developer-supplied function which will be passed\r\n * the current data stored at this location (as a JavaScript object). The\r\n * function should return the new value it would like written (as a JavaScript\r\n * object). If `undefined` is returned (i.e. you return with no arguments) the\r\n * transaction will be aborted and the data at this location will not be\r\n * modified.\r\n * @param options - An options object to configure transactions.\r\n * @returns A `Promise` that can optionally be used instead of the `onComplete`\r\n * callback to handle success and failure.\r\n */\r\nfunction runTransaction(ref, \r\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\r\ntransactionUpdate, options) {\r\n var _a;\r\n ref = getModularInstance(ref);\r\n validateWritablePath('Reference.transaction', ref._path);\r\n if (ref.key === '.length' || ref.key === '.keys') {\r\n throw ('Reference.transaction failed: ' + ref.key + ' is a read-only object.');\r\n }\r\n const applyLocally = (_a = options === null || options === void 0 ? void 0 : options.applyLocally) !== null && _a !== void 0 ? _a : true;\r\n const deferred = new Deferred();\r\n const promiseComplete = (error, committed, node) => {\r\n let dataSnapshot = null;\r\n if (error) {\r\n deferred.reject(error);\r\n }\r\n else {\r\n dataSnapshot = new DataSnapshot(node, new ReferenceImpl(ref._repo, ref._path), PRIORITY_INDEX);\r\n deferred.resolve(new TransactionResult(committed, dataSnapshot));\r\n }\r\n };\r\n // Add a watch to make sure we get server updates.\r\n const unwatcher = onValue(ref, () => { });\r\n repoStartTransaction(ref._repo, ref._path, transactionUpdate, promiseComplete, unwatcher, applyLocally);\r\n return deferred.promise;\r\n}\n\n/**\r\n * @license\r\n * Copyright 2017 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\nPersistentConnection;\r\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\r\nPersistentConnection.prototype.simpleListen = function (pathString, onComplete) {\r\n this.sendRequest('q', { p: pathString }, onComplete);\r\n};\r\n// eslint-disable-next-line @typescript-eslint/no-explicit-any\r\nPersistentConnection.prototype.echo = function (data, onEcho) {\r\n this.sendRequest('echo', { d: data }, onEcho);\r\n};\r\n// RealTimeConnection properties that we use in tests.\r\nConnection;\r\n/**\r\n * @internal\r\n */\r\nconst hijackHash = function (newHash) {\r\n const oldPut = PersistentConnection.prototype.put;\r\n PersistentConnection.prototype.put = function (pathString, data, onComplete, hash) {\r\n if (hash !== undefined) {\r\n hash = newHash();\r\n }\r\n oldPut.call(this, pathString, data, onComplete, hash);\r\n };\r\n return function () {\r\n PersistentConnection.prototype.put = oldPut;\r\n };\r\n};\r\nRepoInfo;\r\n/**\r\n * Forces the RepoManager to create Repos that use ReadonlyRestClient instead of PersistentConnection.\r\n * @internal\r\n */\r\nconst forceRestClient = function (forceRestClient) {\r\n repoManagerForceRestClient(forceRestClient);\r\n};\n\n/**\r\n * @license\r\n * Copyright 2023 Google LLC\r\n *\r\n * Licensed under the Apache License, Version 2.0 (the \"License\");\r\n * you may not use this file except in compliance with the License.\r\n * You may obtain a copy of the License at\r\n *\r\n * http://www.apache.org/licenses/LICENSE-2.0\r\n *\r\n * Unless required by applicable law or agreed to in writing, software\r\n * distributed under the License is distributed on an \"AS IS\" BASIS,\r\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r\n * See the License for the specific language governing permissions and\r\n * limitations under the License.\r\n */\r\n/**\r\n * Used by console to create a database based on the app,\r\n * passed database URL and a custom auth implementation.\r\n * @internal\r\n * @param app - A valid FirebaseApp-like object\r\n * @param url - A valid Firebase databaseURL\r\n * @param version - custom version e.g. firebase-admin version\r\n * @param customAppCheckImpl - custom app check implementation\r\n * @param customAuthImpl - custom auth implementation\r\n */\r\nfunction _initStandalone({ app, url, version, customAuthImpl, customAppCheckImpl, nodeAdmin = false }) {\r\n setSDKVersion(version);\r\n /**\r\n * ComponentContainer('database-standalone') is just a placeholder that doesn't perform\r\n * any actual function.\r\n */\r\n const componentContainer = new ComponentContainer('database-standalone');\r\n const authProvider = new Provider('auth-internal', componentContainer);\r\n let appCheckProvider;\r\n if (customAppCheckImpl) {\r\n appCheckProvider = new Provider('app-check-internal', componentContainer);\r\n appCheckProvider.setComponent(new Component('app-check-internal', () => customAppCheckImpl, \"PRIVATE\" /* ComponentType.PRIVATE */));\r\n }\r\n authProvider.setComponent(new Component('auth-internal', () => customAuthImpl, \"PRIVATE\" /* ComponentType.PRIVATE */));\r\n return repoManagerDatabaseFromApp(app, authProvider, appCheckProvider, url, nodeAdmin);\r\n}\n\n/**\r\n * Firebase Realtime Database\r\n *\r\n * @packageDocumentation\r\n */\r\nregisterDatabase();\n\nexport { DataSnapshot, Database, OnDisconnect, QueryConstraint, TransactionResult, QueryImpl as _QueryImpl, QueryParams as _QueryParams, ReferenceImpl as _ReferenceImpl, forceRestClient as _TEST_ACCESS_forceRestClient, hijackHash as _TEST_ACCESS_hijackHash, _initStandalone, repoManagerDatabaseFromApp as _repoManagerDatabaseFromApp, setSDKVersion as _setSDKVersion, validatePathString as _validatePathString, validateWritablePath as _validateWritablePath, child, connectDatabaseEmulator, enableLogging, endAt, endBefore, equalTo, forceLongPolling, forceWebSockets, get, getDatabase, goOffline, goOnline, increment, limitToFirst, limitToLast, off, onChildAdded, onChildChanged, onChildMoved, onChildRemoved, onDisconnect, onValue, orderByChild, orderByKey, orderByPriority, orderByValue, push, query, ref, refFromURL, remove, runTransaction, serverTimestamp, set, setPriority, setWithPriority, startAfter, startAt, update };\n//# 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