@firebase/firestore/dist/common-B2I0AjXl.node.mjs.map

The Cloud Firestore component of the Firebase JS SDK.

{"version":3,"file":"common-B2I0AjXl.node.mjs","sources":["../src/core/version.ts","../src/platform/node/format_json.ts","../src/util/log.ts","../src/util/assert.ts","../src/platform/node/random_bytes.ts","../src/util/misc.ts","../src/util/sorted_map.ts","../src/util/sorted_set.ts","../src/util/error.ts","../src/model/path.ts","../src/model/field_mask.ts","../src/util/obj.ts","../src/model/document_key.ts","../src/util/input_validation.ts","../src/util/json_validation.ts","../src/lite-api/timestamp.ts","../src/platform/node/base64.ts","../src/util/byte_string.ts","../src/model/normalize.ts","../src/model/server_timestamps.ts","../src/core/database_info.ts","../src/util/types.ts","../src/model/values.ts","../src/model/object_value.ts","../src/remote/number_serializer.ts","../src/model/transform_operation.ts","../src/model/mutation.ts","../src/core/bound.ts","../src/core/filter.ts","../src/core/order_by.ts","../src/core/snapshot_version.ts","../src/model/document.ts","../src/model/field_index.ts","../src/core/target.ts","../src/core/query.ts","../src/remote/existence_filter.ts","../src/remote/rpc_error.ts","../src/util/obj_map.ts","../src/model/collections.ts","../src/util/base64_decode_error.ts","../src/util/testing_hooks_spi.ts","../src/platform/node/text_serializer.ts","../src/remote/bloom_filter.ts","../src/remote/remote_event.ts","../src/remote/watch_change.ts","../src/remote/serializer.ts","../src/platform/node/serializer.ts","../src/lite-api/bytes.ts","../src/lite-api/field_path.ts","../src/lite-api/field_value.ts","../src/lite-api/geo_point.ts","../src/auth/user.ts","../src/util/promise.ts","../src/api/credentials.ts","../src/api/long_polling_options.ts","../src/remote/connectivity_monitor_noop.ts","../src/remote/stream_bridge.ts","../src/util/debug_uid.ts","../src/util/node_api.ts","../src/platform/node/grpc_connection.ts","../src/platform/node/load_protos.ts","../src/platform/node/connection.ts","../src/remote/backoff.ts","../src/remote/persistent_stream.ts","../src/remote/datastore.ts","../src/lite-api/components.ts","../src/local/lru_garbage_collector.ts","../src/core/listen_sequence.ts","../src/local/persistence_transaction.ts","../src/local/local_store.ts","../src/local/persistence_promise.ts","../src/local/simple_db.ts","../src/local/lru_garbage_collector_impl.ts","../src/lite-api/settings.ts","../src/lite-api/database.ts","../src/lite-api/reference.ts","../src/util/array.ts","../src/lite-api/vector_value.ts","../src/lite-api/user_data_reader.ts","../src/core/options_util.ts","../src/util/proto.ts","../src/lite-api/field_value_impl.ts","../src/lite-api/expressions.ts","../src/lite-api/stage.ts","../src/core/expressions.ts","../src/core/pipeline.ts","../src/core/pipeline-util.ts","../src/api/realtime_pipeline.ts","../src/model/mutation_batch.ts","../src/local/encoded_resource_path.ts","../src/local/indexeddb_schema_legacy.ts","../src/local/indexeddb_sentinels.ts","../src/local/indexeddb_mutation_batch_impl.ts","../src/local/indexeddb_transaction.ts","../src/model/overlay.ts","../src/local/target_data.ts","../src/local/local_serializer.ts","../src/local/indexeddb_mutation_queue.ts","../src/local/indexeddb_bundle_cache.ts","../src/local/indexeddb_document_overlay_cache.ts","../src/local/indexeddb_globals_cache.ts","../src/index/firestore_index_value_writer.ts","../src/index/ordered_code_writer.ts","../src/index/index_byte_encoder.ts","../src/index/index_entry.ts","../src/model/target_index_matcher.ts","../src/util/logic_utils.ts","../src/local/memory_index_manager.ts","../src/local/indexeddb_index_manager.ts","../src/core/target_id_generator.ts","../src/local/indexeddb_target_cache.ts","../src/local/indexeddb_lru_delegate_impl.ts","../src/core/pipeline_run.ts","../src/local/remote_document_change_buffer.ts","../src/local/indexeddb_remote_document_cache.ts","../src/local/indexeddb_schema.ts","../src/local/overlayed_document.ts","../src/local/local_documents_view.ts","../src/local/memory_bundle_cache.ts","../src/local/memory_document_overlay_cache.ts","../src/local/memory_globals_cache.ts","../src/local/reference_set.ts","../src/local/memory_mutation_queue.ts","../src/local/memory_remote_document_cache.ts","../src/local/memory_target_cache.ts","../src/local/memory_persistence.ts","../src/local/indexeddb_schema_converter.ts","../src/local/indexeddb_persistence.ts","../src/local/local_store_impl.ts","../src/util/byte_stream.ts","../src/platform/node/byte_stream_reader.ts","../src/remote/online_state_tracker.ts","../src/remote/remote_store.ts","../src/util/async_observer.ts","../src/util/async_queue.ts","../src/util/bundle_reader.ts","../src/util/bundle_reader_impl.ts","../src/util/bundle_reader_sync_impl.ts","../src/local/index_backfiller.ts","../src/model/document_comparator.ts","../src/local/query_context.ts","../src/local/query_engine.ts","../src/local/shared_client_state_schema.ts","../src/local/shared_client_state.ts","../src/platform/node/dom.ts","../src/model/document_set.ts","../src/core/view_snapshot.ts","../src/core/event_manager.ts","../src/local/local_view_changes.ts","../src/core/bundle_impl.ts","../src/core/view.ts","../src/core/sync_engine_impl.ts","../src/core/component_provider.ts","../src/core/transaction.ts","../src/core/transaction_runner.ts","../src/core/firestore_client.ts","../src/core/structured_pipeline.ts","../src/util/async_queue_impl.ts","../src/api/bundle.ts","../src/api/database.ts","../src/lite-api/user_data_writer.ts","../src/api/user_data_writer.ts","../src/core/aggregate.ts","../src/remote/internal_serializer.ts"],"sourcesContent":["/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\n/** The semver (www.semver.org) version of the SDK. */\nimport { version } from '../../../firebase/package.json';\nexport let SDK_VERSION = version;\nexport function setSDKVersion(version: string): void {\n  SDK_VERSION = version;\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { inspect } from 'util';\n\n/** Formats an object as a JSON string, suitable for logging. */\nexport function formatJSON(value: unknown): string {\n  // util.inspect() results in much more readable output than JSON.stringify()\n  return inspect(value, { depth: 100 });\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { Logger, LogLevel, LogLevelString } from '@firebase/logger';\n\nimport { SDK_VERSION } from '../core/version';\nimport { formatJSON } from '../platform/format_json';\n\nexport { LogLevel, LogLevelString };\n\nconst logClient = new Logger('@firebase/firestore');\n\n// Helper methods are needed because variables can't be exported as read/write\nexport function getLogLevel(): LogLevel {\n  return logClient.logLevel;\n}\n\n/**\n * Sets the verbosity of Cloud Firestore logs (debug, error, or silent).\n *\n * @param logLevel - The verbosity you set for activity and error logging. Can\n *   be any of the following values:\n *\n *   <ul>\n *     <li>`debug` for the most verbose logging level, primarily for\n *     debugging.</li>\n *     <li>`error` to log errors only.</li>\n *     <li><code>`silent` to turn off logging.</li>\n *   </ul>\n */\nexport function setLogLevel(logLevel: LogLevelString): void {\n  logClient.setLogLevel(logLevel);\n}\n\nexport function logDebug(msg: string, ...obj: unknown[]): void {\n  if (logClient.logLevel <= LogLevel.DEBUG) {\n    const args = obj.map(argToString);\n    logClient.debug(`Firestore (${SDK_VERSION}): ${msg}`, ...args);\n  }\n}\n\nexport function logError(msg: string, ...obj: unknown[]): void {\n  if (logClient.logLevel <= LogLevel.ERROR) {\n    const args = obj.map(argToString);\n    logClient.error(`Firestore (${SDK_VERSION}): ${msg}`, ...args);\n  }\n}\n\n/**\n * @internal\n */\nexport function logWarn(msg: string, ...obj: unknown[]): void {\n  if (logClient.logLevel <= LogLevel.WARN) {\n    const args = obj.map(argToString);\n    logClient.warn(`Firestore (${SDK_VERSION}): ${msg}`, ...args);\n  }\n}\n\n/**\n * Converts an additional log parameter to a string representation.\n */\nfunction argToString(obj: unknown): string | unknown {\n  if (typeof obj === 'string') {\n    return obj;\n  } else {\n    try {\n      return formatJSON(obj);\n    } catch (e) {\n      // Converting to JSON failed, just log the object directly\n      return obj;\n    }\n  }\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SDK_VERSION } from '../core/version';\n\nimport { logError } from './log';\n\n/**\n * Unconditionally fails, throwing an Error with the given message.\n * Messages are stripped in production builds.\n *\n * Returns `never` and can be used in expressions:\n * @example\n * let futureVar = fail('not implemented yet');\n *\n * @param code - generate a new unique value with `yarn assertion-id:generate`\n * Search for an existing value using `yarn assertion-id:find X`\n */\nexport function fail(\n  code: number,\n  message: string,\n  context?: Record<string, unknown>\n): never;\n\n/**\n * Unconditionally fails, throwing an Error with the given message.\n * Messages are stripped in production builds.\n *\n * Returns `never` and can be used in expressions:\n * @example\n * let futureVar = fail('not implemented yet');\n *\n * @param id - generate a new unique value with `yarn assertion-id:generate`\n * Search for an existing value using `yarn assertion-id:find X`\n */\nexport function fail(id: number, context?: Record<string, unknown>): never;\n\nexport function fail(\n  id: number,\n  messageOrContext?: string | Record<string, unknown>,\n  context?: Record<string, unknown>\n): never {\n  let message = 'Unexpected state';\n  if (typeof messageOrContext === 'string') {\n    message = messageOrContext;\n  } else {\n    context = messageOrContext;\n  }\n  _fail(id, message, context);\n}\n\nfunction _fail(\n  id: number,\n  failure: string,\n  context?: Record<string, unknown>\n): never {\n  // Log the failure in addition to throw an exception, just in case the\n  // exception is swallowed.\n  let message = `FIRESTORE (${SDK_VERSION}) INTERNAL ASSERTION FAILED: ${failure} (ID: ${id.toString(\n    16\n  )})`;\n  if (context !== undefined) {\n    try {\n      const stringContext = JSON.stringify(context);\n      message += ' CONTEXT: ' + stringContext;\n    } catch (e) {\n      message += ' CONTEXT: ' + context;\n    }\n  }\n  logError(message);\n\n  // NOTE: We don't use FirestoreError here because these are internal failures\n  // that cannot be handled by the user. (Also it would create a circular\n  // dependency between the error and assert modules which doesn't work.)\n  throw new Error(message);\n}\n\n/**\n * Fails if the given assertion condition is false, throwing an Error with the\n * given message if it did.\n *\n * Messages are stripped in production builds.\n *\n * @param id - generate a new unique value with `yarn assertion-idgenerate`.\n * Search for an existing value using `yarn assertion-id:find X`\n */\nexport function hardAssert(\n  assertion: boolean,\n  id: number,\n  message: string,\n  context?: Record<string, unknown>\n): asserts assertion;\n\n/**\n * Fails if the given assertion condition is false, throwing an Error with the\n * given message if it did.\n *\n * Messages are stripped in production builds.\n *\n * @param id - generate a new unique value with `yarn assertion-id:generate`.\n * Search for an existing value using `yarn assertion-id:find X`\n */\nexport function hardAssert(\n  assertion: boolean,\n  id: number,\n  context?: Record<string, unknown>\n): asserts assertion;\n\nexport function hardAssert(\n  assertion: boolean,\n  id: number,\n  messageOrContext?: string | Record<string, unknown>,\n  context?: Record<string, unknown>\n): asserts assertion {\n  let message = 'Unexpected state';\n  if (typeof messageOrContext === 'string') {\n    message = messageOrContext;\n  } else {\n    context = messageOrContext;\n  }\n\n  if (!assertion) {\n    _fail(id, message, context);\n  }\n}\n\n/**\n * Fails if the given assertion condition is false, throwing an Error with the\n * given message if it did.\n *\n * The code of callsites invoking this function are stripped out in production\n * builds. Any side-effects of code within the debugAssert() invocation will not\n * happen in this case.\n *\n * @internal\n */\nexport function debugAssert(\n  assertion: boolean,\n  message: string\n): asserts assertion {\n  if (!assertion) {\n    fail(0xdeb6, message);\n  }\n}\n\n/**\n * Casts `obj` to `T`. In non-production builds, verifies that `obj` is an\n * instance of `T` before casting.\n */\nexport function debugCast<T>(\n  obj: object,\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  constructor: { new (...args: any[]): T }\n): T | never {\n  debugAssert(\n    obj instanceof constructor,\n    `Expected type '${constructor.name}', but was '${obj.constructor.name}'`\n  );\n  return obj as T;\n}\n","/**\n * @license\n * Copyright 2020 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { randomBytes as generateRandomBytes } from 'crypto';\n\nimport { debugAssert } from '../../util/assert';\n\n/**\n * Generates `nBytes` of random bytes.\n *\n * If `nBytes < 0` , an error will be thrown.\n */\nexport function randomBytes(nBytes: number): Uint8Array {\n  debugAssert(nBytes >= 0, `Expecting non-negative nBytes, got: ${nBytes}`);\n  return generateRandomBytes(nBytes);\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { randomBytes } from '../platform/random_bytes';\n\nimport { debugAssert } from './assert';\n\nexport type EventHandler<E> = (value: E) => void;\nexport interface Indexable {\n  [k: string]: unknown;\n}\n\n/**\n * A utility class for generating unique alphanumeric IDs of a specified length.\n *\n * @internal\n * Exported internally for testing purposes.\n */\nexport class AutoId {\n  static newId(): string {\n    // Alphanumeric characters\n    const chars =\n      'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';\n    // The largest byte value that is a multiple of `char.length`.\n    const maxMultiple = Math.floor(256 / chars.length) * chars.length;\n    debugAssert(\n      0 < maxMultiple && maxMultiple < 256,\n      `Expect maxMultiple to be (0, 256), but got ${maxMultiple}`\n    );\n\n    let autoId = '';\n    const targetLength = 20;\n    while (autoId.length < targetLength) {\n      const bytes = randomBytes(40);\n      for (let i = 0; i < bytes.length; ++i) {\n        // Only accept values that are [0, maxMultiple), this ensures they can\n        // be evenly mapped to indices of `chars` via a modulo operation.\n        if (autoId.length < targetLength && bytes[i] < maxMultiple) {\n          autoId += chars.charAt(bytes[i] % chars.length);\n        }\n      }\n    }\n    debugAssert(autoId.length === targetLength, 'Invalid auto ID: ' + autoId);\n\n    return autoId;\n  }\n}\n\nexport function primitiveComparator<T>(left: T, right: T): number {\n  if (left < right) {\n    return -1;\n  }\n  if (left > right) {\n    return 1;\n  }\n  return 0;\n}\n\nexport interface Equatable<T> {\n  isEqual(other: T): boolean;\n}\n\n/** Compare strings in UTF-8 encoded byte order */\nexport function compareUtf8Strings(left: string, right: string): number {\n  // Find the first differing character (a.k.a. \"UTF-16 code unit\") in the two strings and,\n  // if found, use that character to determine the relative ordering of the two strings as a\n  // whole. Comparing UTF-16 strings in UTF-8 byte order can be done simply and efficiently by\n  // comparing the UTF-16 code units (chars). This serendipitously works because of the way UTF-8\n  // and UTF-16 happen to represent Unicode code points.\n  //\n  // After finding the first pair of differing characters, there are two cases:\n  //\n  // Case 1: Both characters are non-surrogates (code points less than or equal to 0xFFFF) or\n  // both are surrogates from a surrogate pair (that collectively represent code points greater\n  // than 0xFFFF). In this case their numeric order as UTF-16 code units is the same as the\n  // lexicographical order of their corresponding UTF-8 byte sequences. A direct comparison is\n  // sufficient.\n  //\n  // Case 2: One character is a surrogate and the other is not. In this case the surrogate-\n  // containing string is always ordered after the non-surrogate. This is because surrogates are\n  // used to represent code points greater than 0xFFFF which have 4-byte UTF-8 representations\n  // and are lexicographically greater than the 1, 2, or 3-byte representations of code points\n  // less than or equal to 0xFFFF.\n  //\n  // An example of why Case 2 is required is comparing the following two Unicode code points:\n  //\n  // |-----------------------|------------|---------------------|-----------------|\n  // | Name                  | Code Point | UTF-8 Encoding      | UTF-16 Encoding |\n  // |-----------------------|------------|---------------------|-----------------|\n  // | Replacement Character | U+FFFD     | 0xEF 0xBF 0xBD      | 0xFFFD          |\n  // | Grinning Face         | U+1F600    | 0xF0 0x9F 0x98 0x80 | 0xD83D 0xDE00   |\n  // |-----------------------|------------|---------------------|-----------------|\n  //\n  // A lexicographical comparison of the UTF-8 encodings of these code points would order\n  // \"Replacement Character\" _before_ \"Grinning Face\" because 0xEF is less than 0xF0. However, a\n  // direct comparison of the UTF-16 code units, as would be done in case 1, would erroneously\n  // produce the _opposite_ ordering, because 0xFFFD is _greater than_ 0xD83D. As it turns out,\n  // this relative ordering holds for all comparisons of UTF-16 code points requiring a surrogate\n  // pair with those that do not.\n  const length = Math.min(left.length, right.length);\n  for (let i = 0; i < length; i++) {\n    const leftChar = left.charAt(i);\n    const rightChar = right.charAt(i);\n    if (leftChar !== rightChar) {\n      return isSurrogate(leftChar) === isSurrogate(rightChar)\n        ? primitiveComparator(leftChar, rightChar)\n        : isSurrogate(leftChar)\n        ? 1\n        : -1;\n    }\n  }\n\n  // Use the lengths of the strings to determine the overall comparison result since either the\n  // strings were equal or one is a prefix of the other.\n  return primitiveComparator(left.length, right.length);\n}\n\nconst MIN_SURROGATE = 0xd800;\nconst MAX_SURROGATE = 0xdfff;\n\nexport function isSurrogate(s: string): boolean {\n  debugAssert(s.length === 1, `s.length == ${s.length}, but expected 1`);\n  const c = s.charCodeAt(0);\n  return c >= MIN_SURROGATE && c <= MAX_SURROGATE;\n}\n\nexport interface Iterable<V> {\n  forEach: (cb: (v: V) => void) => void;\n}\n\n/** Helper to compare arrays using isEqual(). */\nexport function arrayEquals<T>(\n  left: T[],\n  right: T[],\n  comparator: (l: T, r: T) => boolean\n): boolean {\n  if (left.length !== right.length) {\n    return false;\n  }\n  return left.every((value, index) => comparator(value, right[index]));\n}\n\n/**\n * Verifies equality for an optional value.\n */\nexport function isOptionalEqual<T>(\n  left: T | undefined,\n  right: T | undefined,\n  equalityTest: (left: T, right: T) => boolean\n): boolean {\n  if (left === undefined && right === undefined) {\n    return true;\n  }\n\n  if (left === undefined || right === undefined) {\n    return false;\n  }\n\n  return equalityTest(left, right);\n}\n\n/**\n * Returns the immediate lexicographically-following string. This is useful to\n * construct an inclusive range for indexeddb iterators.\n */\nexport function immediateSuccessor(s: string): string {\n  // Return the input string, with an additional NUL byte appended.\n  return s + '\\0';\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { debugAssert, fail } from './assert';\n\n/*\n * Implementation of an immutable SortedMap using a Left-leaning\n * Red-Black Tree, adapted from the implementation in Mugs\n * (http://mads379.github.com/mugs/) by Mads Hartmann Jensen\n * (mads379@gmail.com).\n *\n * Original paper on Left-leaning Red-Black Trees:\n *   http://www.cs.princeton.edu/~rs/talks/LLRB/LLRB.pdf\n *\n * Invariant 1: No red node has a red child\n * Invariant 2: Every leaf path has the same number of black nodes\n * Invariant 3: Only the left child can be red (left leaning)\n */\n\nexport type Comparator<K> = (key1: K, key2: K) => number;\n\nexport interface Entry<K, V> {\n  key: K;\n  value: V;\n}\n\n// An immutable sorted map implementation, based on a Left-leaning Red-Black\n// tree.\nexport class SortedMap<K, V> {\n  // visible for testing\n  root: LLRBNode<K, V> | LLRBEmptyNode<K, V>;\n\n  constructor(\n    public comparator: Comparator<K>,\n    root?: LLRBNode<K, V> | LLRBEmptyNode<K, V>\n  ) {\n    this.root = root ? root : LLRBNode.EMPTY;\n  }\n\n  // Returns a copy of the map, with the specified key/value added or replaced.\n  insert(key: K, value: V): SortedMap<K, V> {\n    return new SortedMap<K, V>(\n      this.comparator,\n      this.root\n        .insert(key, value, this.comparator)\n        .copy(null, null, LLRBNode.BLACK, null, null)\n    );\n  }\n\n  // Returns a copy of the map, with the specified key removed.\n  remove(key: K): SortedMap<K, V> {\n    return new SortedMap<K, V>(\n      this.comparator,\n      this.root\n        .remove(key, this.comparator)\n        .copy(null, null, LLRBNode.BLACK, null, null)\n    );\n  }\n\n  // Returns the value of the node with the given key, or null.\n  get(key: K): V | null {\n    let node = this.root;\n    while (!node.isEmpty()) {\n      const cmp = this.comparator(key, node.key);\n      if (cmp === 0) {\n        return node.value;\n      } else if (cmp < 0) {\n        node = node.left;\n      } else if (cmp > 0) {\n        node = node.right;\n      }\n    }\n    return null;\n  }\n\n  // Returns the index of the element in this sorted map, or -1 if it doesn't\n  // exist.\n  indexOf(key: K): number {\n    // Number of nodes that were pruned when descending right\n    let prunedNodes = 0;\n    let node = this.root;\n    while (!node.isEmpty()) {\n      const cmp = this.comparator(key, node.key);\n      if (cmp === 0) {\n        return prunedNodes + node.left.size;\n      } else if (cmp < 0) {\n        node = node.left;\n      } else {\n        // Count all nodes left of the node plus the node itself\n        prunedNodes += node.left.size + 1;\n        node = node.right;\n      }\n    }\n    // Node not found\n    return -1;\n  }\n\n  isEmpty(): boolean {\n    return this.root.isEmpty();\n  }\n\n  // Returns the total number of nodes in the map.\n  get size(): number {\n    return this.root.size;\n  }\n\n  // Returns the minimum key in the map.\n  minKey(): K | null {\n    return this.root.minKey();\n  }\n\n  // Returns the maximum key in the map.\n  maxKey(): K | null {\n    return this.root.maxKey();\n  }\n\n  // Traverses the map in key order and calls the specified action function\n  // for each key/value pair. If action returns true, traversal is aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  inorderTraversal<T>(action: (k: K, v: V) => T): T {\n    return (this.root as LLRBNode<K, V>).inorderTraversal(action);\n  }\n\n  forEach(fn: (k: K, v: V) => void): void {\n    this.inorderTraversal((k, v) => {\n      fn(k, v);\n      return false;\n    });\n  }\n\n  toString(): string {\n    const descriptions: string[] = [];\n    this.inorderTraversal((k, v) => {\n      descriptions.push(`${k}:${v}`);\n      return false;\n    });\n    return `{${descriptions.join(', ')}}`;\n  }\n\n  // Traverses the map in reverse key order and calls the specified action\n  // function for each key/value pair. If action returns true, traversal is\n  // aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  reverseTraversal<T>(action: (k: K, v: V) => T): T {\n    return (this.root as LLRBNode<K, V>).reverseTraversal(action);\n  }\n\n  // Returns an iterator over the SortedMap.\n  getIterator(): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, null, this.comparator, false);\n  }\n\n  getIteratorFrom(key: K): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, key, this.comparator, false);\n  }\n\n  getReverseIterator(): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, null, this.comparator, true);\n  }\n\n  getReverseIteratorFrom(key: K): SortedMapIterator<K, V> {\n    return new SortedMapIterator<K, V>(this.root, key, this.comparator, true);\n  }\n} // end SortedMap\n\n// An iterator over an LLRBNode.\nexport class SortedMapIterator<K, V> {\n  private isReverse: boolean;\n  private nodeStack: Array<LLRBNode<K, V> | LLRBEmptyNode<K, V>>;\n\n  constructor(\n    node: LLRBNode<K, V> | LLRBEmptyNode<K, V>,\n    startKey: K | null,\n    comparator: Comparator<K>,\n    isReverse: boolean\n  ) {\n    this.isReverse = isReverse;\n    this.nodeStack = [];\n\n    let cmp = 1;\n    while (!node.isEmpty()) {\n      cmp = startKey ? comparator(node.key, startKey) : 1;\n      // flip the comparison if we're going in reverse\n      if (startKey && isReverse) {\n        cmp *= -1;\n      }\n\n      if (cmp < 0) {\n        // This node is less than our start key. ignore it\n        if (this.isReverse) {\n          node = node.left;\n        } else {\n          node = node.right;\n        }\n      } else if (cmp === 0) {\n        // This node is exactly equal to our start key. Push it on the stack,\n        // but stop iterating;\n        this.nodeStack.push(node);\n        break;\n      } else {\n        // This node is greater than our start key, add it to the stack and move\n        // to the next one\n        this.nodeStack.push(node);\n        if (this.isReverse) {\n          node = node.right;\n        } else {\n          node = node.left;\n        }\n      }\n    }\n  }\n\n  getNext(): Entry<K, V> {\n    debugAssert(\n      this.nodeStack.length > 0,\n      'getNext() called on iterator when hasNext() is false.'\n    );\n\n    let node = this.nodeStack.pop()!;\n    const result = { key: node.key, value: node.value };\n\n    if (this.isReverse) {\n      node = node.left;\n      while (!node.isEmpty()) {\n        this.nodeStack.push(node);\n        node = node.right;\n      }\n    } else {\n      node = node.right;\n      while (!node.isEmpty()) {\n        this.nodeStack.push(node);\n        node = node.left;\n      }\n    }\n\n    return result;\n  }\n\n  hasNext(): boolean {\n    return this.nodeStack.length > 0;\n  }\n\n  peek(): Entry<K, V> | null {\n    if (this.nodeStack.length === 0) {\n      return null;\n    }\n\n    const node = this.nodeStack[this.nodeStack.length - 1];\n    return { key: node.key, value: node.value };\n  }\n} // end SortedMapIterator\n\n// Represents a node in a Left-leaning Red-Black tree.\nexport class LLRBNode<K, V> {\n  readonly color: boolean;\n  readonly left: LLRBNode<K, V> | LLRBEmptyNode<K, V>;\n  readonly right: LLRBNode<K, V> | LLRBEmptyNode<K, V>;\n  readonly size: number;\n\n  // Empty node is shared between all LLRB trees.\n  // eslint-disable-next-line @typescript-eslint/no-explicit-any\n  static EMPTY: LLRBEmptyNode<any, any> = null as any;\n\n  static RED = true;\n  static BLACK = false;\n\n  constructor(\n    public key: K,\n    public value: V,\n    color?: boolean,\n    left?: LLRBNode<K, V> | LLRBEmptyNode<K, V>,\n    right?: LLRBNode<K, V> | LLRBEmptyNode<K, V>\n  ) {\n    this.color = color != null ? color : LLRBNode.RED;\n    this.left = left != null ? left : LLRBNode.EMPTY;\n    this.right = right != null ? right : LLRBNode.EMPTY;\n    this.size = this.left.size + 1 + this.right.size;\n  }\n\n  // Returns a copy of the current node, optionally replacing pieces of it.\n  copy(\n    key: K | null,\n    value: V | null,\n    color: boolean | null,\n    left: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null,\n    right: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null\n  ): LLRBNode<K, V> {\n    return new LLRBNode<K, V>(\n      key != null ? key : this.key,\n      value != null ? value : this.value,\n      color != null ? color : this.color,\n      left != null ? left : this.left,\n      right != null ? right : this.right\n    );\n  }\n\n  isEmpty(): boolean {\n    return false;\n  }\n\n  // Traverses the tree in key order and calls the specified action function\n  // for each node. If action returns true, traversal is aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  inorderTraversal<T>(action: (k: K, v: V) => T): T {\n    return (\n      (this.left as LLRBNode<K, V>).inorderTraversal(action) ||\n      action(this.key, this.value) ||\n      (this.right as LLRBNode<K, V>).inorderTraversal(action)\n    );\n  }\n\n  // Traverses the tree in reverse key order and calls the specified action\n  // function for each node. If action returns true, traversal is aborted.\n  // Returns the first truthy value returned by action, or the last falsey\n  // value returned by action.\n  reverseTraversal<T>(action: (k: K, v: V) => T): T {\n    return (\n      (this.right as LLRBNode<K, V>).reverseTraversal(action) ||\n      action(this.key, this.value) ||\n      (this.left as LLRBNode<K, V>).reverseTraversal(action)\n    );\n  }\n\n  // Returns the minimum node in the tree.\n  private min(): LLRBNode<K, V> {\n    if (this.left.isEmpty()) {\n      return this;\n    } else {\n      return (this.left as LLRBNode<K, V>).min();\n    }\n  }\n\n  // Returns the maximum key in the tree.\n  minKey(): K | null {\n    return this.min().key;\n  }\n\n  // Returns the maximum key in the tree.\n  maxKey(): K | null {\n    if (this.right.isEmpty()) {\n      return this.key;\n    } else {\n      return this.right.maxKey();\n    }\n  }\n\n  // Returns new tree, with the key/value added.\n  insert(key: K, value: V, comparator: Comparator<K>): LLRBNode<K, V> {\n    let n: LLRBNode<K, V> = this;\n    const cmp = comparator(key, n.key);\n    if (cmp < 0) {\n      n = n.copy(null, null, null, n.left.insert(key, value, comparator), null);\n    } else if (cmp === 0) {\n      n = n.copy(null, value, null, null, null);\n    } else {\n      n = n.copy(\n        null,\n        null,\n        null,\n        null,\n        n.right.insert(key, value, comparator)\n      );\n    }\n    return n.fixUp();\n  }\n\n  private removeMin(): LLRBNode<K, V> | LLRBEmptyNode<K, V> {\n    if (this.left.isEmpty()) {\n      return LLRBNode.EMPTY;\n    }\n    let n: LLRBNode<K, V> = this;\n    if (!n.left.isRed() && !n.left.left.isRed()) {\n      n = n.moveRedLeft();\n    }\n    n = n.copy(null, null, null, (n.left as LLRBNode<K, V>).removeMin(), null);\n    return n.fixUp();\n  }\n\n  // Returns new tree, with the specified item removed.\n  remove(\n    key: K,\n    comparator: Comparator<K>\n  ): LLRBNode<K, V> | LLRBEmptyNode<K, V> {\n    let smallest: LLRBNode<K, V>;\n    let n: LLRBNode<K, V> = this;\n    if (comparator(key, n.key) < 0) {\n      if (!n.left.isEmpty() && !n.left.isRed() && !n.left.left.isRed()) {\n        n = n.moveRedLeft();\n      }\n      n = n.copy(null, null, null, n.left.remove(key, comparator), null);\n    } else {\n      if (n.left.isRed()) {\n        n = n.rotateRight();\n      }\n      if (!n.right.isEmpty() && !n.right.isRed() && !n.right.left.isRed()) {\n        n = n.moveRedRight();\n      }\n      if (comparator(key, n.key) === 0) {\n        if (n.right.isEmpty()) {\n          return LLRBNode.EMPTY;\n        } else {\n          smallest = (n.right as LLRBNode<K, V>).min();\n          n = n.copy(\n            smallest.key,\n            smallest.value,\n            null,\n            null,\n            (n.right as LLRBNode<K, V>).removeMin()\n          );\n        }\n      }\n      n = n.copy(null, null, null, null, n.right.remove(key, comparator));\n    }\n    return n.fixUp();\n  }\n\n  isRed(): boolean {\n    return this.color;\n  }\n\n  // Returns new tree after performing any needed rotations.\n  private fixUp(): LLRBNode<K, V> {\n    let n: LLRBNode<K, V> = this;\n    if (n.right.isRed() && !n.left.isRed()) {\n      n = n.rotateLeft();\n    }\n    if (n.left.isRed() && n.left.left.isRed()) {\n      n = n.rotateRight();\n    }\n    if (n.left.isRed() && n.right.isRed()) {\n      n = n.colorFlip();\n    }\n    return n;\n  }\n\n  private moveRedLeft(): LLRBNode<K, V> {\n    let n = this.colorFlip();\n    if (n.right.left.isRed()) {\n      n = n.copy(\n        null,\n        null,\n        null,\n        null,\n        (n.right as LLRBNode<K, V>).rotateRight()\n      );\n      n = n.rotateLeft();\n      n = n.colorFlip();\n    }\n    return n;\n  }\n\n  private moveRedRight(): LLRBNode<K, V> {\n    let n = this.colorFlip();\n    if (n.left.left.isRed()) {\n      n = n.rotateRight();\n      n = n.colorFlip();\n    }\n    return n;\n  }\n\n  private rotateLeft(): LLRBNode<K, V> {\n    const nl = this.copy(null, null, LLRBNode.RED, null, this.right.left);\n    return (this.right as LLRBNode<K, V>).copy(\n      null,\n      null,\n      this.color,\n      nl,\n      null\n    );\n  }\n\n  private rotateRight(): LLRBNode<K, V> {\n    const nr = this.copy(null, null, LLRBNode.RED, this.left.right, null);\n    return (this.left as LLRBNode<K, V>).copy(null, null, this.color, null, nr);\n  }\n\n  private colorFlip(): LLRBNode<K, V> {\n    const left = this.left.copy(null, null, !this.left.color, null, null);\n    const right = this.right.copy(null, null, !this.right.color, null, null);\n    return this.copy(null, null, !this.color, left, right);\n  }\n\n  // For testing.\n  checkMaxDepth(): boolean {\n    const blackDepth = this.check();\n    if (Math.pow(2.0, blackDepth) <= this.size + 1) {\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n  // In a balanced RB tree, the black-depth (number of black nodes) from root to\n  // leaves is equal on both sides.  This function verifies that or asserts.\n  protected check(): number {\n    if (this.isRed() && this.left.isRed()) {\n      throw fail(0xaad2, 'Red node has red child', {\n        key: this.key,\n        value: this.value\n      });\n    }\n    if (this.right.isRed()) {\n      throw fail(0x3721, 'Right child of (`key`, `value`) is red', {\n        key: this.key,\n        value: this.value\n      });\n    }\n    const blackDepth = (this.left as LLRBNode<K, V>).check();\n    if (blackDepth !== (this.right as LLRBNode<K, V>).check()) {\n      throw fail(0x6d2d, 'Black depths differ');\n    } else {\n      return blackDepth + (this.isRed() ? 0 : 1);\n    }\n  }\n} // end LLRBNode\n\n// Represents an empty node (a leaf node in the Red-Black Tree).\nexport class LLRBEmptyNode<K, V> {\n  get key(): never {\n    throw fail(0xe1a6, 'LLRBEmptyNode has no key.');\n  }\n  get value(): never {\n    throw fail(0x3f0d, 'LLRBEmptyNode has no value.');\n  }\n  get color(): never {\n    throw fail(0x4157, 'LLRBEmptyNode has no color.');\n  }\n  get left(): never {\n    throw fail(0x741e, 'LLRBEmptyNode has no left child.');\n  }\n  get right(): never {\n    throw fail(0x901e, 'LLRBEmptyNode has no right child.');\n  }\n  size = 0;\n\n  // Returns a copy of the current node.\n  copy(\n    key: K | null,\n    value: V | null,\n    color: boolean | null,\n    left: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null,\n    right: LLRBNode<K, V> | LLRBEmptyNode<K, V> | null\n  ): LLRBEmptyNode<K, V> {\n    return this;\n  }\n\n  // Returns a copy of the tree, with the specified key/value added.\n  insert(key: K, value: V, comparator: Comparator<K>): LLRBNode<K, V> {\n    return new LLRBNode<K, V>(key, value);\n  }\n\n  // Returns a copy of the tree, with the specified key removed.\n  remove(key: K, comparator: Comparator<K>): LLRBEmptyNode<K, V> {\n    return this;\n  }\n\n  isEmpty(): boolean {\n    return true;\n  }\n\n  inorderTraversal(action: (k: K, v: V) => boolean): boolean {\n    return false;\n  }\n\n  reverseTraversal(action: (k: K, v: V) => boolean): boolean {\n    return false;\n  }\n\n  minKey(): K | null {\n    return null;\n  }\n\n  maxKey(): K | null {\n    return null;\n  }\n\n  isRed(): boolean {\n    return false;\n  }\n\n  // For testing.\n  checkMaxDepth(): boolean {\n    return true;\n  }\n\n  protected check(): 0 {\n    return 0;\n  }\n} // end LLRBEmptyNode\n\nLLRBNode.EMPTY = new LLRBEmptyNode<unknown, unknown>();\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { SortedMap, SortedMapIterator } from './sorted_map';\n\n/**\n * SortedSet is an immutable (copy-on-write) collection that holds elements\n * in order specified by the provided comparator.\n *\n * NOTE: if provided comparator returns 0 for two elements, we consider them to\n * be equal!\n */\nexport class SortedSet<T> {\n  private data: SortedMap<T, boolean>;\n\n  constructor(private comparator: (left: T, right: T) => number) {\n    this.data = new SortedMap<T, boolean>(this.comparator);\n  }\n\n  has(elem: T): boolean {\n    return this.data.get(elem) !== null;\n  }\n\n  first(): T | null {\n    return this.data.minKey();\n  }\n\n  last(): T | null {\n    return this.data.maxKey();\n  }\n\n  get size(): number {\n    return this.data.size;\n  }\n\n  indexOf(elem: T): number {\n    return this.data.indexOf(elem);\n  }\n\n  /** Iterates elements in order defined by \"comparator\" */\n  forEach(cb: (elem: T) => void): void {\n    this.data.inorderTraversal((k: T, v: boolean) => {\n      cb(k);\n      return false;\n    });\n  }\n\n  /** Iterates over `elem`s such that: range[0] &lt;= elem &lt; range[1]. */\n  forEachInRange(range: [T, T], cb: (elem: T) => void): void {\n    const iter = this.data.getIteratorFrom(range[0]);\n    while (iter.hasNext()) {\n      const elem = iter.getNext();\n      if (this.comparator(elem.key, range[1]) >= 0) {\n        return;\n      }\n      cb(elem.key);\n    }\n  }\n\n  /**\n   * Iterates over `elem`s such that: start &lt;= elem until false is returned.\n   */\n  forEachWhile(cb: (elem: T) => boolean, start?: T): void {\n    let iter: SortedMapIterator<T, boolean>;\n    if (start !== undefined) {\n      iter = this.data.getIteratorFrom(start);\n    } else {\n      iter = this.data.getIterator();\n    }\n    while (iter.hasNext()) {\n      const elem = iter.getNext();\n      const result = cb(elem.key);\n      if (!result) {\n        return;\n      }\n    }\n  }\n\n  /** Finds the least element greater than or equal to `elem`. */\n  firstAfterOrEqual(elem: T): T | null {\n    const iter = this.data.getIteratorFrom(elem);\n    return iter.hasNext() ? iter.getNext().key : null;\n  }\n\n  getIterator(): SortedSetIterator<T> {\n    return new SortedSetIterator<T>(this.data.getIterator());\n  }\n\n  getIteratorFrom(key: T): SortedSetIterator<T> {\n    return new SortedSetIterator<T>(this.data.getIteratorFrom(key));\n  }\n\n  /** Inserts or updates an element */\n  add(elem: T): SortedSet<T> {\n    return this.copy(this.data.remove(elem).insert(elem, true));\n  }\n\n  /** Deletes an element */\n  delete(elem: T): SortedSet<T> {\n    if (!this.has(elem)) {\n      return this;\n    }\n    return this.copy(this.data.remove(elem));\n  }\n\n  isEmpty(): boolean {\n    return this.data.isEmpty();\n  }\n\n  unionWith(other: SortedSet<T>): SortedSet<T> {\n    let result: SortedSet<T> = this;\n\n    // Make sure `result` always refers to the larger one of the two sets.\n    if (result.size < other.size) {\n      result = other;\n      other = this;\n    }\n\n    other.forEach(elem => {\n      result = result.add(elem);\n    });\n    return result;\n  }\n\n  isEqual(other: SortedSet<T>): boolean {\n    if (!(other instanceof SortedSet)) {\n      return false;\n    }\n    if (this.size !== other.size) {\n      return false;\n    }\n\n    const thisIt = this.data.getIterator();\n    const otherIt = other.data.getIterator();\n    while (thisIt.hasNext()) {\n      const thisElem = thisIt.getNext().key;\n      const otherElem = otherIt.getNext().key;\n      if (this.comparator(thisElem, otherElem) !== 0) {\n        return false;\n      }\n    }\n    return true;\n  }\n\n  toArray(): T[] {\n    const res: T[] = [];\n    this.forEach(targetId => {\n      res.push(targetId);\n    });\n    return res;\n  }\n\n  toString(): string {\n    const result: T[] = [];\n    this.forEach(elem => result.push(elem));\n    return 'SortedSet(' + result.toString() + ')';\n  }\n\n  private copy(data: SortedMap<T, boolean>): SortedSet<T> {\n    const result = new SortedSet(this.comparator);\n    result.data = data;\n    return result;\n  }\n}\n\nexport class SortedSetIterator<T> {\n  constructor(private iter: SortedMapIterator<T, boolean>) {}\n\n  getNext(): T {\n    return this.iter.getNext().key;\n  }\n\n  hasNext(): boolean {\n    return this.iter.hasNext();\n  }\n}\n\n/**\n * Compares two sorted sets for equality using their natural ordering. The\n * method computes the intersection and invokes `onAdd` for every element that\n * is in `after` but not `before`. `onRemove` is invoked for every element in\n * `before` but missing from `after`.\n *\n * The method creates a copy of both `before` and `after` and runs in O(n log\n * n), where n is the size of the two lists.\n *\n * @param before - The elements that exist in the original set.\n * @param after - The elements to diff against the original set.\n * @param comparator - The comparator for the elements in before and after.\n * @param onAdd - A function to invoke for every element that is part of `\n * after` but not `before`.\n * @param onRemove - A function to invoke for every element that is part of\n * `before` but not `after`.\n */\nexport function diffSortedSets<T>(\n  before: SortedSet<T>,\n  after: SortedSet<T>,\n  comparator: (l: T, r: T) => number,\n  onAdd: (entry: T) => void,\n  onRemove: (entry: T) => void\n): void {\n  const beforeIt = before.getIterator();\n  const afterIt = after.getIterator();\n\n  let beforeValue = advanceIterator(beforeIt);\n  let afterValue = advanceIterator(afterIt);\n\n  // Walk through the two sets at the same time, using the ordering defined by\n  // `comparator`.\n  while (beforeValue || afterValue) {\n    let added = false;\n    let removed = false;\n\n    if (beforeValue && afterValue) {\n      const cmp = comparator(beforeValue, afterValue);\n      if (cmp < 0) {\n        // The element was removed if the next element in our ordered\n        // walkthrough is only in `before`.\n        removed = true;\n      } else if (cmp > 0) {\n        // The element was added if the next element in our ordered walkthrough\n        // is only in `after`.\n        added = true;\n      }\n    } else if (beforeValue != null) {\n      removed = true;\n    } else {\n      added = true;\n    }\n\n    if (added) {\n      onAdd(afterValue!);\n      afterValue = advanceIterator(afterIt);\n    } else if (removed) {\n      onRemove(beforeValue!);\n      beforeValue = advanceIterator(beforeIt);\n    } else {\n      beforeValue = advanceIterator(beforeIt);\n      afterValue = advanceIterator(afterIt);\n    }\n  }\n}\n\n/**\n * Returns the next element from the iterator or `undefined` if none available.\n */\nfunction advanceIterator<T>(it: SortedSetIterator<T>): T | undefined {\n  return it.hasNext() ? it.getNext() : undefined;\n}\n","/**\n * @license\n * Copyright 2017 Google LLC\n *\n * Licensed under the Apache License, Version 2.0 (the \"License\");\n * you may not use this file except in compliance with the License.\n * You may obtain a copy of the License at\n *\n *   http://www.apache.org/licenses/LICENSE-2.0\n *\n * Unless required by applicable law or agreed to in writing, software\n * distributed under the License is distributed on an \"AS IS\" BASIS,\n * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\n * See the License for the specific language governing permissions and\n * limitations under the License.\n */\n\nimport { FirebaseError } from '@firebase/util';\n\n/**\n * The set of Firestore status codes. The codes are the same at the ones\n * exposed by gRPC here:\n * https://github.com/grpc/grpc/blob/master/doc/statuscodes.md\n *\n * Possible values:\n * - 'cancelled': The operation was cancelled (typically by the caller).\n * - 'unknown': Unknown error or an error from a different error domain.\n * - 'invalid-argument': Client specified an invalid argument. Note that this\n *   differs from 'failed-precondition'. 'invalid-argument' indicates\n *   arguments that are problematic regardless of the state of the system\n *   (e.g. an invalid field name).\n * - 'deadline-exceeded': Deadline expired before operation could complete.\n *   For operations that change the state of the system, this error may be\n *   returned even if the operation has completed successfully. For example,\n *   a successful response from a server could have been delayed long enough\n *   for the deadline to expire.\n * - 'not-found': Some requested document was not found.\n * - 'already-exists': Some document that we attempted to create already\n *   exists.\n * - 'permission-denied': The caller does not have permission to execute the\n *   specified operation.\n * - 'resource-exhausted': Some resource has been exhausted, perhaps a\n *   per-user quota, or perhaps the entire file system is out of space.\n * - 'failed-precondition': Operation was rejected because the system is not\n *   in a state required