{
  "version": 3,
  "sources": ["../../src/lib/TLSyncRoom.ts"],
  "sourcesContent": ["import {\n\tAtomMap,\n\tMigrationFailureReason,\n\tRecordType,\n\tSerializedSchema,\n\tStoreSchema,\n\tUnknownRecord,\n} from '@tldraw/store'\nimport {\n\tassert,\n\tassertExists,\n\texhaustiveSwitchError,\n\tgetOwnProperty,\n\tisEqual,\n\tisNativeStructuredClone,\n\tobjectMapEntriesIterable,\n\tResult,\n\tthrottle,\n} from '@tldraw/utils'\nimport { createNanoEvents } from 'nanoevents'\nimport {\n\tapplyObjectDiff,\n\tdiffRecord,\n\tNetworkDiff,\n\tObjectDiff,\n\tRecordOp,\n\tRecordOpType,\n\tValueOpType,\n} from './diff'\nimport { interval } from './interval'\nimport {\n\tgetTlsyncProtocolVersion,\n\tTLIncompatibilityReason,\n\tTLObjectStoreAccess,\n\tTLSocketClientSentEvent,\n\tTLSocketServerSentDataEvent,\n\tTLSocketServerSentEvent,\n} from './protocol'\nimport { applyAndDiffRecord, diffAndValidateRecord, validateRecord } from './recordDiff'\nimport {\n\tRoomSession,\n\tRoomSessionState,\n\tSESSION_IDLE_TIMEOUT,\n\tSESSION_REMOVAL_WAIT_TIME,\n\tSESSION_START_WAIT_TIME,\n} from './RoomSession'\nimport { TLSyncLog } from './TLSocketRoom'\nimport { TLSyncError, TLSyncErrorCloseEventCode, TLSyncErrorCloseEventReason } from './TLSyncClient'\nimport {\n\tTLSyncForwardDiff,\n\tTLSyncStorage,\n\tTLSyncStorageTransaction,\n\ttoNetworkDiff,\n} from './TLSyncStorage'\n\n/**\n * WebSocket interface for server-side room connections. This defines the contract\n * that socket implementations must follow to work with TLSyncRoom.\n *\n * @internal\n */\nexport interface TLRoomSocket<R extends UnknownRecord> {\n\t/**\n\t * Whether the socket connection is currently open and ready to send messages.\n\t */\n\tisOpen: boolean\n\t/**\n\t * Send a message to the connected client through this socket.\n\t *\n\t * @param msg - The server-sent event message to transmit\n\t */\n\tsendMessage(msg: TLSocketServerSentEvent<R>): void\n\t/**\n\t * Close the socket connection with optional status code and reason.\n\t *\n\t * @param code - WebSocket close code (optional)\n\t * @param reason - Human-readable close reason (optional)\n\t */\n\tclose(code?: number, reason?: string): void\n}\n\n/**\n * The minimum time interval (in milliseconds) between sending batched data messages\n * to clients. This debouncing prevents overwhelming clients with rapid updates.\n * @public\n */\nexport const DATA_MESSAGE_DEBOUNCE_INTERVAL = 1000 / 60\n\nconst timeSince = (time: number) => Date.now() - time\n\n// WebSocket close frames cap the reason at 123 UTF-8 bytes; a longer one makes `close()` throw\nconst MAX_CLOSE_REASON_BYTES = 123\nconst closeReasonEncoder = new TextEncoder()\n\nconst truncatedSuffix = (droppedBytes: number) => `... (+${droppedBytes} bytes)`\n\nfunction truncateCloseReason(reason: string) {\n\tconst totalBytes = closeReasonEncoder.encode(reason).length\n\tif (totalBytes <= MAX_CLOSE_REASON_BYTES) return reason\n\t// the dropped count can't have more digits than the total, so reserving room for it always fits\n\tconst budget = MAX_CLOSE_REASON_BYTES - truncatedSuffix(totalBytes).length\n\tlet out = ''\n\tlet outBytes = 0\n\t// step by code point so a multi-byte character is never cut in half\n\tfor (const char of reason) {\n\t\tconst charBytes = closeReasonEncoder.encode(char).length\n\t\tif (outBytes + charBytes > budget) break\n\t\tout += char\n\t\toutBytes += charBytes\n\t}\n\treturn out + truncatedSuffix(totalBytes - outBytes)\n}\n\n/**\n * Snapshot of a room's complete state that can be persisted and restored.\n * Contains all documents, tombstones, and metadata needed to reconstruct the room.\n *\n * @public\n */\nexport interface RoomSnapshot {\n\t/**\n\t * The current logical clock value for the room\n\t */\n\tclock?: number\n\t/**\n\t * Clock value when document data was last changed (optional for backwards compatibility)\n\t */\n\tdocumentClock?: number\n\t/**\n\t * Array of all document records with their last modification clocks\n\t */\n\tdocuments: Array<{ state: UnknownRecord; lastChangedClock: number }>\n\t/**\n\t * Map of deleted record IDs to their deletion clock values (optional)\n\t */\n\ttombstones?: Record<string, number>\n\t/**\n\t * Clock value where tombstone history begins - older deletions are not tracked (optional)\n\t */\n\ttombstoneHistoryStartsAtClock?: number\n\t/**\n\t * Serialized schema used when creating this snapshot (optional)\n\t */\n\tschema?: SerializedSchema\n}\n\n/**\n * Authorizes a single record write from a client: any per-record, per-session rule the host wants\n * to enforce server-side \u2014 veto writes the session isn't allowed to make, or rewrite the record on\n * create. The session's `meta` carries whatever the rule needs (identity, roles, \u2026); for example,\n * force a comment's `authorId` to the signed-in user so nobody can post in someone else's name.\n *\n * Called on **create**, **update**, and **delete** of records whose `typeName` it's registered for\n * (see {@link TLRecordAuthorizers}), and only for client pushes \u2014 never for server-initiated writes.\n *\n * `prev` and `next` are always at the **server's** schema version: client writes are migrated\n * before the authorizer runs, so guarding or stamping a field never requires knowing what older\n * clients call it. On create, the record you return is what gets stored (after validation) \u2014 no\n * migration runs afterwards, so stamped fields can't be clobbered.\n *\n * Return `null` to reject the write \u2014 it's skipped and the client self-corrects, exactly like the\n * `objectAccess` gate. Otherwise the write is allowed, and:\n *\n * - on **create**, the record you return is what gets stored, so stamp identity fields here (e.g.\n *   set `authorId` from `session.meta`);\n * - on **update** and **delete**, only allow-vs-reject is used (the returned record's contents are\n *   ignored), so use them to veto changes to immutable fields or unauthorized deletes \u2014 return\n *   `next`/`prev` to allow, `null` to reject.\n *\n * \u26A0\uFE0E Runs synchronously inside the commit transaction, on the same path as every document edit \u2014 it\n * must be fast and do **no** I/O. `next`/`prev` are client-controlled records, so treat their\n * contents as untrusted; prefer returning `null` to reject over throwing, though a throw is\n * caught, logged, and treated as a rejection (fail closed) rather than crashing the push. For\n * expensive, async checks (e.g. resolving mentions against who can access a file), react after the\n * fact via `onCommittedChanges`.\n *\n * @public\n */\nexport type TLRecordAuthorizer<Rec extends UnknownRecord, SessionMeta> = (\n\targs: {\n\t\t/** The session performing the write: its host-provided `meta` (e.g. the authenticated user\n\t\t *  id) and the canvas-lane `isReadonly` state, for hosts whose object-lane policy follows\n\t\t *  canvas access. */\n\t\tsession: { sessionId: string; isReadonly: boolean; meta: SessionMeta }\n\t} & (\n\t\t| { type: 'create'; prev: null; next: Rec }\n\t\t| { type: 'update'; prev: Rec; next: Rec }\n\t\t| { type: 'delete'; prev: Rec; next: null }\n\t)\n) => Rec | null\n\n/**\n * A map from record `typeName` to a {@link TLRecordAuthorizer} for that record type. Only listed\n * types are authorized; every other record writes through untouched, so this stays off the hot path\n * for the vast majority of writes (shape drags etc.).\n *\n * Each authorizer is typed to its record \u2014 e.g. `next` in the `comment` entry is a `TLComment` \u2014 so\n * renaming a field on the record makes the authorizer that reads it fail to compile, rather than\n * silently stamp or guard the wrong field.\n *\n * Presence records are never authorized (presence is per-session and ephemeral); registering the\n * presence typeName is a construction-time error.\n *\n * @public\n */\nexport type TLRecordAuthorizers<R extends UnknownRecord, SessionMeta> = {\n\t[K in R['typeName']]?: TLRecordAuthorizer<Extract<R, { typeName: K }>, SessionMeta>\n}\n\n/**\n * A collaborative workspace that manages multiple client sessions and synchronizes\n * document changes between them. The room serves as the authoritative source for\n * all document state and handles conflict resolution, schema migrations, and\n * real-time data distribution.\n *\n * @example\n * ```ts\n * const room = new TLSyncRoom({\n *   schema: mySchema,\n *   onDataChange: () => saveToDatabase(room.getSnapshot()),\n *   onPresenceChange: () => updateLiveCursors()\n * })\n *\n * // Handle new client connections\n * room.handleNewSession({\n *   sessionId: 'user-123',\n *   socket: webSocketAdapter,\n *   meta: { userId: '123', name: 'Alice' },\n *   isReadonly: false\n * })\n * ```\n *\n * @internal\n */\nexport class TLSyncRoom<R extends UnknownRecord, SessionMeta> {\n\t// A table of connected clients\n\treadonly sessions = new Map<string, RoomSession<R, SessionMeta>>()\n\n\tprivate lastDocumentClock = 0\n\n\tprivate pruneTimer: ReturnType<typeof setTimeout> | null = null\n\n\tpruneSessions = throttle(() => {\n\t\tif (this.pruneTimer) {\n\t\t\tclearTimeout(this.pruneTimer)\n\t\t\tthis.pruneTimer = null\n\t\t}\n\t\tfor (const client of this.sessions.values()) {\n\t\t\tswitch (client.state) {\n\t\t\t\tcase RoomSessionState.Connected: {\n\t\t\t\t\tconst hasTimedOut = timeSince(client.lastInteractionTime) > this.sessionIdleTimeout\n\t\t\t\t\tif (hasTimedOut || !client.socket.isOpen) {\n\t\t\t\t\t\tthis.cancelSession(client.sessionId)\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t\tcase RoomSessionState.AwaitingConnectMessage: {\n\t\t\t\t\tconst hasTimedOut = timeSince(client.sessionStartTime) > SESSION_START_WAIT_TIME\n\t\t\t\t\tif (hasTimedOut || !client.socket.isOpen) {\n\t\t\t\t\t\t// remove immediately\n\t\t\t\t\t\tthis.removeSession(client.sessionId)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthis.scheduleFollowUpPrune()\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t\tcase RoomSessionState.AwaitingRemoval: {\n\t\t\t\t\tconst hasTimedOut = timeSince(client.cancellationTime) > SESSION_REMOVAL_WAIT_TIME\n\t\t\t\t\tif (hasTimedOut) {\n\t\t\t\t\t\tthis.removeSession(client.sessionId)\n\t\t\t\t\t} else {\n\t\t\t\t\t\tthis.scheduleFollowUpPrune()\n\t\t\t\t\t}\n\t\t\t\t\tbreak\n\t\t\t\t}\n\t\t\t\tdefault: {\n\t\t\t\t\texhaustiveSwitchError(client)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}, 1000)\n\n\tprivate scheduleFollowUpPrune() {\n\t\t// don't leave a stray timer on a room the host has already torn down\n\t\tif (this._isClosed || this.pruneTimer) return\n\t\tthis.pruneTimer = setTimeout(this.pruneSessions, SESSION_REMOVAL_WAIT_TIME + 100)\n\t}\n\n\treadonly presenceStore = new PresenceStore<R>()\n\n\tprivate disposables: Array<() => void> = []\n\n\tprivate _isClosed = false\n\n\t/**\n\t * Close the room and clean up all resources. Disconnects all sessions\n\t * and stops background processes.\n\t */\n\tclose() {\n\t\tthis._isClosed = true\n\t\tthis.disposables.forEach((d) => d())\n\t\tthis.sessions.forEach((session) => {\n\t\t\tthis.clearDebounceTimer(session)\n\t\t\ttry {\n\t\t\t\tsession.socket.close()\n\t\t\t} catch {\n\t\t\t\t// noop, one bad socket must not leave the rest open\n\t\t\t}\n\t\t})\n\t\t// forgetting the sessions is what makes late socket close/error events no-ops, so\n\t\t// nothing can emit session_removed / room_became_empty on a closed room\n\t\tthis.sessions.clear()\n\t}\n\n\tprivate clearDebounceTimer(session: RoomSession<R, SessionMeta>) {\n\t\tif (session.state === RoomSessionState.Connected && session.debounceTimer !== null) {\n\t\t\tclearTimeout(session.debounceTimer)\n\t\t\tsession.debounceTimer = null\n\t\t\tsession.outstandingDataMessages = []\n\t\t}\n\t}\n\n\t/**\n\t * Check if the room has been closed and is no longer accepting connections.\n\t *\n\t * @returns True if the room is closed\n\t */\n\tisClosed() {\n\t\treturn this._isClosed\n\t}\n\n\treadonly events = createNanoEvents<{\n\t\troom_became_empty(): void\n\t\tsession_removed(args: { sessionId: string; meta: SessionMeta }): void\n\t}>()\n\n\t// Storage layer for documents, tombstones, and clocks\n\tprivate readonly storage: TLSyncStorage<R>\n\n\treadonly serializedSchema: SerializedSchema\n\n\treadonly documentTypes: Set<string>\n\t/**\n\t * Record types served by the object-store lane. Object records ride the same wire messages\n\t * as document records but are gated by the session's `objectAccess` instead of `isReadonly`,\n\t * and are excluded from `documentTypes` so hosts can persist them in a separate lane.\n\t */\n\treadonly objectTypes: Set<string>\n\treadonly presenceType: RecordType<R, any> | null\n\tprivate log?: TLSyncLog\n\tpublic readonly schema: StoreSchema<R, any>\n\tprivate onPresenceChange?(): void\n\tprivate onCommittedChanges?(args: { diff: TLSyncForwardDiff<R>; documentClock: number }): void\n\tprivate readonly authorizeRecord?: TLRecordAuthorizers<R, SessionMeta>\n\tprivate readonly sessionIdleTimeout: number\n\n\t/**\n\t * The authorizer registered for a record type, widened to the room's record union. Each entry in\n\t * `authorizeRecord` is typed to its specific record; the cast here is the one place we can't\n\t * statically correlate a runtime `typeName` with its record type, so it lives in the library\n\t * rather than in every consumer.\n\t */\n\tprivate authorizerFor(typeName: R['typeName']): TLRecordAuthorizer<R, SessionMeta> | undefined {\n\t\tconst authorize = this.authorizeRecord?.[typeName] as\n\t\t\t| TLRecordAuthorizer<R, SessionMeta>\n\t\t\t| undefined\n\t\tif (!authorize) return undefined\n\t\t// Fail closed: an authorizer that throws rejects the write (and is logged) rather than\n\t\t// aborting the whole push. Authorizers are security-sensitive, so a bug must never let a\n\t\t// write through.\n\t\treturn (args) => {\n\t\t\ttry {\n\t\t\t\treturn authorize(args)\n\t\t\t} catch (e) {\n\t\t\t\tthis.log?.error?.('record authorizer threw; rejecting the write', e)\n\t\t\t\treturn null\n\t\t\t}\n\t\t}\n\t}\n\n\tconstructor(opts: {\n\t\tlog?: TLSyncLog\n\t\tschema: StoreSchema<R, any>\n\t\tonPresenceChange?(): void\n\t\t/**\n\t\t * Called once after a client push commits, with the committed document diff. Fires for\n\t\t * local and remote pushes. Use this to react to document changes (e.g. persist certain\n\t\t * record types to a separate lane, or project them to an external store) as soon as they\n\t\t * commit. Best-effort \u2014 do not throw; do not block.\n\t\t */\n\t\tonCommittedChanges?(args: { diff: TLSyncForwardDiff<R>; documentClock: number }): void\n\t\t/**\n\t\t * Record type names to serve through the object-store lane instead of the document lane.\n\t\t * Each must be a document-scoped type registered in the schema. Object-lane writes are\n\t\t * gated per session by `objectAccess` rather than `isReadonly`.\n\t\t */\n\t\tobjectTypes?: readonly string[]\n\t\t/**\n\t\t * Per-type authorizers for client record writes (create, update, delete): veto or, on\n\t\t * create, rewrite. See {@link TLRecordAuthorizers}.\n\t\t */\n\t\tauthorizeRecord?: TLRecordAuthorizers<R, SessionMeta>\n\t\tstorage: TLSyncStorage<R>\n\t\tclientTimeout?: number\n\t}) {\n\t\tthis.schema = opts.schema\n\t\tthis.log = opts.log\n\t\tthis.onPresenceChange = opts.onPresenceChange\n\t\tthis.onCommittedChanges = opts.onCommittedChanges\n\t\tthis.authorizeRecord = opts.authorizeRecord\n\t\tthis.storage = opts.storage\n\t\tthis.sessionIdleTimeout = opts.clientTimeout ?? SESSION_IDLE_TIMEOUT\n\n\t\tassert(\n\t\t\tisNativeStructuredClone,\n\t\t\t'TLSyncRoom is supposed to run either on Cloudflare Workers' +\n\t\t\t\t'or on a 18+ version of Node.js, which both support the native structuredClone API'\n\t\t)\n\n\t\t// do a json serialization cycle to make sure the schema has no 'undefined' values\n\t\tthis.serializedSchema = JSON.parse(JSON.stringify(this.schema.serialize()))\n\n\t\tthis.objectTypes = new Set(opts.objectTypes ?? [])\n\t\tfor (const typeName of this.objectTypes) {\n\t\t\tconst type = getOwnProperty(this.schema.types, typeName)\n\t\t\tassert(type, `TLSyncRoom: object type '${typeName}' is not registered in the schema`)\n\t\t\tassert(\n\t\t\t\ttype.scope === 'document',\n\t\t\t\t`TLSyncRoom: object type '${typeName}' must have scope 'document', got '${type.scope}'`\n\t\t\t)\n\t\t}\n\n\t\t// object-lane types are partitioned out of the document lane\n\t\tthis.documentTypes = new Set(\n\t\t\tObject.values<RecordType<R, any>>(this.schema.types)\n\t\t\t\t.filter((t) => t.scope === 'document' && !this.objectTypes.has(t.typeName))\n\t\t\t\t.map((t) => t.typeName)\n\t\t)\n\n\t\tconst presenceTypes = new Set(\n\t\t\tObject.values<RecordType<R, any>>(this.schema.types).filter((t) => t.scope === 'presence')\n\t\t)\n\n\t\tif (presenceTypes.size > 1) {\n\t\t\tthrow new Error(\n\t\t\t\t`TLSyncRoom: exactly zero or one presence type is expected, but found ${presenceTypes.size}`\n\t\t\t)\n\t\t}\n\n\t\tthis.presenceType = presenceTypes.values().next()?.value ?? null\n\n\t\t// The presence lane never consults authorizers, so a presence key in `authorizeRecord`\n\t\t// would be a silent no-op \u2014 fail loudly at construction instead.\n\t\tif (this.presenceType && this.authorizeRecord) {\n\t\t\tassert(\n\t\t\t\t!getOwnProperty(this.authorizeRecord, this.presenceType.typeName),\n\t\t\t\t`TLSyncRoom: authorizeRecord['${this.presenceType.typeName}'] is a presence type; presence records are not authorized`\n\t\t\t)\n\t\t}\n\n\t\tconst { documentClock } = this.storage.transaction((txn) => {\n\t\t\tthis.schema.migrateStorage(txn)\n\t\t})\n\n\t\tthis.lastDocumentClock = documentClock\n\n\t\tthis.disposables.push(\n\t\t\tthis.storage.onChange(({ id }) => {\n\t\t\t\tif (id !== this.internalTxnId) {\n\t\t\t\t\tthis.broadcastExternalStorageChanges()\n\t\t\t\t}\n\t\t\t})\n\t\t)\n\n\t\tthis.disposables.push(() => {\n\t\t\tthis.pruneSessions.cancel()\n\t\t\tif (this.pruneTimer) {\n\t\t\t\tclearTimeout(this.pruneTimer)\n\t\t\t\tthis.pruneTimer = null\n\t\t\t}\n\t\t})\n\n\t\t// When clientTimeout is finite, run periodic pruning so idle sessions are\n\t\t// cleaned up even with no traffic. When Infinity or 0 we skip the interval\n\t\t// (e.g. for hibernation); without it, pruning only runs on message or when\n\t\t// socket close/error triggers cancelSession, so pruning idle sessions\n\t\t// reliably depends on the runtime delivering those events.\n\t\tif (Number.isFinite(this.sessionIdleTimeout) && this.sessionIdleTimeout > 0) {\n\t\t\tconst pruneIntervalMs = Math.min(2000, Math.floor(this.sessionIdleTimeout / 4))\n\t\t\tthis.disposables.push(interval(() => this.pruneSessions(), pruneIntervalMs))\n\t\t}\n\t}\n\tprivate broadcastExternalStorageChanges() {\n\t\tthis.storage.transaction((txn) => {\n\t\t\tthis.broadcastChanges(txn)\n\t\t\tthis.lastDocumentClock = txn.getClock()\n\t\t}) // no id needed because this only reads, no writes.\n\t}\n\n\t/**\n\t * Send a message to a particular client. Debounces data events\n\t *\n\t * @param sessionId - The id of the session to send the message to.\n\t * @param message - The message to send. UNSAFE Any diffs must have been downgraded already if necessary\n\t */\n\tprivate _unsafe_sendMessage(\n\t\tsessionId: string,\n\t\tmessage: TLSocketServerSentEvent<R> | TLSocketServerSentDataEvent<R>\n\t) {\n\t\tconst session = this.sessions.get(sessionId)\n\t\tif (!session) {\n\t\t\tthis.log?.warn?.('Tried to send message to unknown session', message.type)\n\t\t\treturn\n\t\t}\n\t\tif (session.state !== RoomSessionState.Connected) {\n\t\t\tthis.log?.warn?.('Tried to send message to disconnected client', message.type)\n\t\t\treturn\n\t\t}\n\t\tif (session.socket.isOpen) {\n\t\t\tif (message.type !== 'patch' && message.type !== 'push_result') {\n\t\t\t\t// this is not a data message\n\t\t\t\tif (message.type !== 'pong') {\n\t\t\t\t\t// non-data messages like \"connect\" might still need to be ordered correctly with\n\t\t\t\t\t// respect to data messages, so it's better to flush just in case\n\t\t\t\t\tthis._flushDataMessages(sessionId)\n\t\t\t\t}\n\t\t\t\tsession.socket.sendMessage(message)\n\t\t\t} else {\n\t\t\t\tif (session.debounceTimer === null) {\n\t\t\t\t\t// this is the first message since the last flush, don't delay it\n\t\t\t\t\tsession.socket.sendMessage({ type: 'data', data: [message] })\n\n\t\t\t\t\tsession.debounceTimer = setTimeout(\n\t\t\t\t\t\t() => this._flushDataMessages(sessionId),\n\t\t\t\t\t\tDATA_MESSAGE_DEBOUNCE_INTERVAL\n\t\t\t\t\t)\n\t\t\t\t} else {\n\t\t\t\t\tsession.outstandingDataMessages.push(message)\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\tthis.cancelSession(session.sessionId)\n\t\t}\n\t}\n\n\t// needs to accept sessionId and not a session because the session might be dead by the time\n\t// the timer fires\n\t_flushDataMessages(sessionId: string) {\n\t\tconst session = this.sessions.get(sessionId)\n\n\t\tif (!session || session.state !== RoomSessionState.Connected) {\n\t\t\treturn\n\t\t}\n\n\t\tsession.debounceTimer = null\n\n\t\tif (session.outstandingDataMessages.length > 0) {\n\t\t\t// hand the buffer over and start a fresh one, rather than truncating in\n\t\t\t// place, so sockets that defer serialization don't see an emptied array\n\t\t\tconst data = session.outstandingDataMessages\n\t\t\tsession.outstandingDataMessages = []\n\t\t\tif (!session.socket.isOpen) {\n\t\t\t\t// same as the immediate-send path: send() into a closed socket throws on\n\t\t\t\t// some runtimes (Cloudflare), and here that would be from inside a timer\n\t\t\t\tthis.cancelSession(sessionId)\n\t\t\t\treturn\n\t\t\t}\n\t\t\tsession.socket.sendMessage({ type: 'data', data })\n\t\t}\n\t}\n\n\t/** @internal */\n\tprivate removeSession(sessionId: string, fatalReason?: string) {\n\t\tconst session = this.sessions.get(sessionId)\n\t\tif (!session) {\n\t\t\tthis.log?.warn?.('Tried to remove unknown session')\n\t\t\treturn\n\t\t}\n\n\t\tthis.sessions.delete(sessionId)\n\t\tthis.clearDebounceTimer(session)\n\n\t\ttry {\n\t\t\tif (fatalReason) {\n\t\t\t\t// the session is already gone, so a throwing close() would leave its socket open\n\t\t\t\tsession.socket.close(TLSyncErrorCloseEventCode, truncateCloseReason(fatalReason))\n\t\t\t} else {\n\t\t\t\tsession.socket.close()\n\t\t\t}\n\t\t} catch {\n\t\t\t// noop, calling .close() multiple times is fine\n\t\t}\n\n\t\tconst presence = this.presenceStore.get(session.presenceId ?? '')\n\t\tif (presence) {\n\t\t\tthis.presenceStore.delete(session.presenceId!)\n\t\t\t// Broadcast presence removal - use RecordsDiff with the removed record\n\t\t\tthis.broadcastPatch({\n\t\t\t\tputs: {},\n\t\t\t\tdeletes: [session.presenceId!],\n\t\t\t})\n\t\t}\n\n\t\tthis.events.emit('session_removed', { sessionId, meta: session.meta })\n\t\tif (this.sessions.size === 0) {\n\t\t\tthis.events.emit('room_became_empty')\n\t\t}\n\t}\n\n\tprivate cancelSession(sessionId: string) {\n\t\tconst session = this.sessions.get(sessionId)\n\t\tif (!session) {\n\t\t\treturn\n\t\t}\n\n\t\tif (session.state === RoomSessionState.AwaitingRemoval) {\n\t\t\tthis.log?.warn?.('Tried to cancel session that is already awaiting removal')\n\t\t\treturn\n\t\t}\n\n\t\tthis.clearDebounceTimer(session)\n\t\tthis.sessions.set(sessionId, {\n\t\t\tstate: RoomSessionState.AwaitingRemoval,\n\t\t\tsessionId,\n\t\t\tpresenceId: session.presenceId,\n\t\t\tsocket: session.socket,\n\t\t\tcancellationTime: Date.now(),\n\t\t\tmeta: session.meta,\n\t\t\tisReadonly: session.isReadonly,\n\t\t\tobjectAccess: session.objectAccess,\n\t\t\trequiresLegacyRejection: session.requiresLegacyRejection,\n\t\t\tsupportsStringAppend: session.supportsStringAppend,\n\t\t})\n\n\t\ttry {\n\t\t\tsession.socket.close()\n\t\t} catch {\n\t\t\t// noop, calling .close() multiple times is fine\n\t\t}\n\n\t\tthis.scheduleFollowUpPrune()\n\t}\n\n\treadonly internalTxnId = 'TLSyncRoom.txn'\n\n\t/**\n\t * Broadcast a patch to all connected clients except the one with the sessionId provided.\n\t *\n\t * @param diff - The TLSyncForwardDiff with full records (used for migration)\n\t * @param networkDiff - Optional pre-computed NetworkDiff for sessions not needing migration.\n\t *                      If not provided, will be computed from recordsDiff.\n\t * @param sourceSessionId - Optional session ID to exclude from the broadcast\n\t */\n\tprivate broadcastPatch(\n\t\tdiff: TLSyncForwardDiff<R>,\n\t\tnetworkDiff?: NetworkDiff<R> | null,\n\t\tsourceSessionId?: string\n\t) {\n\t\t// Pre-compute network diff if not provided\n\t\tconst unmigrated = networkDiff ?? toNetworkDiff(diff)\n\t\tif (!unmigrated) return this\n\n\t\tthis.sessions.forEach((session) => {\n\t\t\tif (session.state !== RoomSessionState.Connected) return\n\t\t\tif (sourceSessionId === session.sessionId) return\n\t\t\tif (!session.socket.isOpen) {\n\t\t\t\tthis.cancelSession(session.sessionId)\n\t\t\t\treturn\n\t\t\t}\n\n\t\t\tconst diffResult = this.migrateDiffOrRejectSession(\n\t\t\t\tsession.sessionId,\n\t\t\t\tsession.serializedSchema,\n\t\t\t\tsession.requiresDownMigrations,\n\t\t\t\tdiff\n\t\t\t)\n\t\t\tif (!diffResult.ok) return\n\n\t\t\tthis._unsafe_sendMessage(session.sessionId, {\n\t\t\t\ttype: 'patch',\n\t\t\t\tdiff: diffResult.value,\n\t\t\t\tserverClock: this.lastDocumentClock,\n\t\t\t})\n\t\t})\n\t\treturn this\n\t}\n\n\t/**\n\t * Send a custom message to a connected client. Useful for application-specific\n\t * communication that doesn't involve document synchronization.\n\t *\n\t * @param sessionId - The ID of the session to send the message to\n\t * @param data - The custom payload to send (will be JSON serialized)\n\t * @example\n\t * ```ts\n\t * // Send a custom notification\n\t * room.sendCustomMessage('user-123', {\n\t *   type: 'notification',\n\t *   message: 'Document saved successfully'\n\t * })\n\t *\n\t * // Send user-specific data\n\t * room.sendCustomMessage('user-456', {\n\t *   type: 'user_permissions',\n\t *   canEdit: true,\n\t *   canDelete: false\n\t * })\n\t * ```\n\t */\n\tsendCustomMessage(sessionId: string, data: any): void {\n\t\tthis._unsafe_sendMessage(sessionId, { type: 'custom', data })\n\t}\n\n\t/**\n\t * Register a new client session with the room. The session will be in an awaiting\n\t * state until it sends a connect message with protocol handshake.\n\t *\n\t * @param opts - Session configuration\n\t *   - sessionId - Unique identifier for this session\n\t *   - socket - WebSocket adapter for communication\n\t *   - meta - Application-specific metadata for this session\n\t *   - isReadonly - Whether this session can modify documents\n\t * @returns This room instance for method chaining\n\t * @example\n\t * ```ts\n\t * room.handleNewSession({\n\t *   sessionId: crypto.randomUUID(),\n\t *   socket: new WebSocketAdapter(ws),\n\t *   meta: { userId: '123', name: 'Alice', avatar: 'url' },\n\t *   isReadonly: !hasEditPermission\n\t * })\n\t * ```\n\t *\n\t * @internal\n\t */\n\thandleNewSession(opts: {\n\t\tsessionId: string\n\t\tsocket: TLRoomSocket<R>\n\t\tmeta: SessionMeta\n\t\tisReadonly: boolean\n\t\tobjectAccess?: TLObjectStoreAccess\n\t}) {\n\t\tconst { sessionId, socket, meta, isReadonly, objectAccess } = opts\n\t\t// a connect racing close() would otherwise create a session nothing ever prunes\n\t\tif (this._isClosed) {\n\t\t\tsocket.close()\n\t\t\treturn this\n\t\t}\n\t\tconst existing = this.sessions.get(sessionId)\n\t\tif (existing) this.clearDebounceTimer(existing)\n\t\tthis.sessions.set(sessionId, {\n\t\t\tstate: RoomSessionState.AwaitingConnectMessage,\n\t\t\tsessionId,\n\t\t\tsocket,\n\t\t\tpresenceId: existing?.presenceId ?? this.presenceType?.createId() ?? null,\n\t\t\tsessionStartTime: Date.now(),\n\t\t\tmeta,\n\t\t\tisReadonly: isReadonly ?? false,\n\t\t\tobjectAccess: objectAccess ?? 'write',\n\t\t\t// this gets set later during handleConnectMessage\n\t\t\trequiresLegacyRejection: false,\n\t\t\tsupportsStringAppend: true,\n\t\t})\n\t\treturn this\n\t}\n\n\t/**\n\t * Resume a previously-connected session directly into `Connected` state, bypassing the\n\t * connect handshake. Used after server hibernation when the WebSocket is still alive but\n\t * all in-memory state has been lost.\n\t *\n\t * @internal\n\t */\n\thandleResumedSession(opts: {\n\t\tsessionId: string\n\t\tsocket: TLRoomSocket<R>\n\t\tmeta: SessionMeta\n\t\tisReadonly: boolean\n\t\tobjectAccess?: TLObjectStoreAccess\n\t\tserializedSchema: SerializedSchema\n\t\tpresenceId: string | null\n\t\tpresenceRecord: UnknownRecord | null\n\t\trequiresLegacyRejection: boolean\n\t\tsupportsStringAppend: boolean\n\t}) {\n\t\tconst {\n\t\t\tsessionId,\n\t\t\tsocket,\n\t\t\tmeta,\n\t\t\tisReadonly,\n\t\t\tobjectAccess,\n\t\t\tserializedSchema,\n\t\t\tpresenceId,\n\t\t\tpresenceRecord,\n\t\t\trequiresLegacyRejection,\n\t\t\tsupportsStringAppend,\n\t\t} = opts\n\n\t\tif (this._isClosed) {\n\t\t\tsocket.close()\n\t\t\treturn\n\t\t}\n\n\t\tconst migrations = this.schema.getMigrationsSince(serializedSchema)\n\t\tconst requiresDownMigrations = migrations.ok ? migrations.value.length > 0 : false\n\n\t\tthis.sessions.set(sessionId, {\n\t\t\tstate: RoomSessionState.Connected,\n\t\t\tsessionId,\n\t\t\tsocket,\n\t\t\tpresenceId: presenceId ?? this.presenceType?.createId() ?? null,\n\t\t\tserializedSchema,\n\t\t\trequiresDownMigrations,\n\t\t\tlastInteractionTime: Date.now(),\n\t\t\tdebounceTimer: null,\n\t\t\toutstandingDataMessages: [],\n\t\t\tmeta,\n\t\t\tisReadonly,\n\t\t\tobjectAccess: objectAccess ?? 'write',\n\t\t\trequiresLegacyRejection,\n\t\t\tsupportsStringAppend,\n\t\t})\n\n\t\tif (presenceRecord && presenceId) {\n\t\t\tthis.presenceStore.set(presenceId, presenceRecord as R)\n\t\t}\n\t}\n\n\t/**\n\t * Checks if all connected sessions support string append operations (protocol version 8+).\n\t * If any client is on an older version, returns false to enable legacy append mode.\n\t *\n\t * @returns True if all connected sessions are on protocol version 8 or higher\n\t */\n\tgetCanEmitStringAppend(): boolean {\n\t\tfor (const session of this.sessions.values()) {\n\t\t\tif (session.state === RoomSessionState.Connected) {\n\t\t\t\tif (!session.supportsStringAppend) {\n\t\t\t\t\treturn false\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn true\n\t}\n\n\t/**\n\t * When we send a diff to a client, if that client is on a lower version than us, we need to make\n\t * the diff compatible with their version. This method takes a TLSyncForwardDiff (which has full\n\t * records) and migrates all records down to the client's schema version, returning a NetworkDiff.\n\t *\n\t * For updates (entries with [before, after] tuples), both records are migrated and a patch is\n\t * computed from the migrated versions, preserving efficient patch semantics even across versions.\n\t *\n\t * If a migration fails, the session will be rejected.\n\t *\n\t * @param sessionId - The session ID (for rejection on migration failure)\n\t * @param serializedSchema - The client's schema to migrate to\n\t * @param requiresDownMigrations - Whether the client needs down migrations\n\t * @param diff - The TLSyncForwardDiff containing full records to migrate\n\t * @param unmigrated - Optional pre-computed NetworkDiff for when no migration is needed\n\t * @returns A NetworkDiff with migrated records, or a migration failure\n\t */\n\tprivate migrateDiffOrRejectSession(\n\t\tsessionId: string,\n\t\tserializedSchema: SerializedSchema,\n\t\trequiresDownMigrations: boolean,\n\t\tdiff: TLSyncForwardDiff<R>,\n\t\tunmigrated?: NetworkDiff<R>\n\t): Result<NetworkDiff<R>, MigrationFailureReason> {\n\t\tif (!requiresDownMigrations) {\n\t\t\treturn Result.ok(unmigrated ?? toNetworkDiff(diff) ?? {})\n\t\t}\n\n\t\tconst result: NetworkDiff<R> = {}\n\n\t\t// Migrate puts (either adds or updates)\n\t\tfor (const [id, put] of objectMapEntriesIterable(diff.puts)) {\n\t\t\tif (Array.isArray(put)) {\n\t\t\t\t// Update: [before, after] tuple - migrate both and compute patch\n\t\t\t\tconst [from, to] = put\n\t\t\t\tconst fromResult = this.schema.migratePersistedRecord(from, serializedSchema, 'down')\n\t\t\t\tif (fromResult.type === 'error') {\n\t\t\t\t\tthis.rejectSession(sessionId, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\t\t\treturn Result.err(fromResult.reason)\n\t\t\t\t}\n\t\t\t\tconst toResult = this.schema.migratePersistedRecord(to, serializedSchema, 'down')\n\t\t\t\tif (toResult.type === 'error') {\n\t\t\t\t\tthis.rejectSession(sessionId, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\t\t\treturn Result.err(toResult.reason)\n\t\t\t\t}\n\t\t\t\tconst patch = diffRecord(fromResult.value, toResult.value)\n\t\t\t\tif (patch) {\n\t\t\t\t\tresult[id] = [RecordOpType.Patch, patch]\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Add: single record - migrate and put\n\t\t\t\tconst migrationResult = this.schema.migratePersistedRecord(put, serializedSchema, 'down')\n\t\t\t\tif (migrationResult.type === 'error') {\n\t\t\t\t\tthis.rejectSession(sessionId, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\t\t\treturn Result.err(migrationResult.reason)\n\t\t\t\t}\n\t\t\t\tresult[id] = [RecordOpType.Put, migrationResult.value]\n\t\t\t}\n\t\t}\n\n\t\t// Deletes don't need migration\n\t\tfor (const id of diff.deletes) {\n\t\t\tresult[id] = [RecordOpType.Remove]\n\t\t}\n\n\t\treturn Result.ok(result)\n\t}\n\n\t/**\n\t * Process an incoming message from a client session. Handles connection requests,\n\t * data synchronization pushes, and ping/pong for connection health.\n\t *\n\t * @param sessionId - The ID of the session that sent the message\n\t * @param message - The client message to process\n\t * @example\n\t * ```ts\n\t * // Typically called by WebSocket message handlers\n\t * websocket.onMessage((data) => {\n\t *   const message = JSON.parse(data)\n\t *   room.handleMessage(sessionId, message)\n\t * })\n\t * ```\n\t */\n\tasync handleMessage(sessionId: string, message: TLSocketClientSentEvent<R>) {\n\t\tconst session = this.sessions.get(sessionId)\n\t\tif (!session) {\n\t\t\tthis.log?.warn?.('Received message from unknown session')\n\t\t\treturn\n\t\t}\n\t\ttry {\n\t\t\tswitch (message.type) {\n\t\t\t\tcase 'connect': {\n\t\t\t\t\treturn this.handleConnectRequest(session, message)\n\t\t\t\t}\n\t\t\t\tcase 'push': {\n\t\t\t\t\treturn this.handlePushRequest(session, message)\n\t\t\t\t}\n\t\t\t\tcase 'ping': {\n\t\t\t\t\tif (session.state === RoomSessionState.Connected) {\n\t\t\t\t\t\tsession.lastInteractionTime = Date.now()\n\t\t\t\t\t}\n\t\t\t\t\treturn this._unsafe_sendMessage(session.sessionId, { type: 'pong' })\n\t\t\t\t}\n\t\t\t\tdefault: {\n\t\t\t\t\texhaustiveSwitchError(message)\n\t\t\t\t}\n\t\t\t}\n\t\t} catch (e) {\n\t\t\tif (e instanceof TLSyncError) {\n\t\t\t\tthis.rejectSession(session.sessionId, e.reason)\n\t\t\t} else {\n\t\t\t\t// log error and reboot the room?\n\t\t\t\tthrow e\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Reject and disconnect a session due to incompatibility or other fatal errors.\n\t * Sends appropriate error messages before closing the connection.\n\t *\n\t * @param sessionId - The session to reject\n\t * @param fatalReason - The reason for rejection (optional). WebSocket close reasons are capped\n\t * at 123 UTF-8 bytes, so a longer reason is truncated and ends with `... (+N bytes)`.\n\t * @example\n\t * ```ts\n\t * // Reject due to version mismatch\n\t * room.rejectSession('user-123', TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t *\n\t * // Reject due to permission issue\n\t * room.rejectSession('user-456', 'Insufficient permissions')\n\t * ```\n\t */\n\trejectSession(sessionId: string, fatalReason?: TLSyncErrorCloseEventReason | string) {\n\t\tconst session = this.sessions.get(sessionId)\n\t\tif (!session) return\n\t\tif (!fatalReason) {\n\t\t\tthis.removeSession(sessionId)\n\t\t\treturn\n\t\t}\n\t\tif (session.requiresLegacyRejection) {\n\t\t\ttry {\n\t\t\t\tif (session.socket.isOpen) {\n\t\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\t\t\t\t\tlet legacyReason: TLIncompatibilityReason\n\t\t\t\t\tswitch (fatalReason) {\n\t\t\t\t\t\tcase TLSyncErrorCloseEventReason.CLIENT_TOO_OLD:\n\t\t\t\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\t\t\t\t\t\t\tlegacyReason = TLIncompatibilityReason.ClientTooOld\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\tcase TLSyncErrorCloseEventReason.SERVER_TOO_OLD:\n\t\t\t\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\t\t\t\t\t\t\tlegacyReason = TLIncompatibilityReason.ServerTooOld\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\tcase TLSyncErrorCloseEventReason.INVALID_RECORD:\n\t\t\t\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\t\t\t\t\t\t\tlegacyReason = TLIncompatibilityReason.InvalidRecord\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\tdefault:\n\t\t\t\t\t\t\t// eslint-disable-next-line @typescript-eslint/no-deprecated\n\t\t\t\t\t\t\tlegacyReason = TLIncompatibilityReason.InvalidOperation\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t}\n\t\t\t\t\tsession.socket.sendMessage({\n\t\t\t\t\t\ttype: 'incompatibility_error',\n\t\t\t\t\t\treason: legacyReason,\n\t\t\t\t\t})\n\t\t\t\t}\n\t\t\t} catch {\n\t\t\t\t// noop\n\t\t\t} finally {\n\t\t\t\tthis.removeSession(sessionId)\n\t\t\t}\n\t\t} else {\n\t\t\tthis.removeSession(sessionId, fatalReason)\n\t\t}\n\t}\n\n\tprivate forceAllReconnect() {\n\t\tfor (const session of this.sessions.values()) {\n\t\t\t// Only connected clients hold state at a clock we can no longer diff from. A session\n\t\t\t// mid-handshake gets hydrated from its own lastServerClock in the same transaction, so\n\t\t\t// removing it would close its socket and then re-add it as Connected (resurrected).\n\t\t\tif (session.state !== RoomSessionState.Connected) continue\n\t\t\tthis.removeSession(session.sessionId)\n\t\t}\n\t}\n\n\tprivate broadcastChanges(txn: TLSyncStorageTransaction<R>) {\n\t\tconst changes = txn.getChangesSince(this.lastDocumentClock)\n\t\tif (!changes) return\n\t\tconst { wipeAll, diff } = changes\n\t\tthis.lastDocumentClock = txn.getClock()\n\t\tif (wipeAll) {\n\t\t\t// If this happens it means we'd need to broadcast a wipe_all message to all clients,\n\t\t\t// which is not part of the protocol yet, so we need to force all clients to reconnect instead.\n\t\t\tthis.forceAllReconnect()\n\t\t\treturn\n\t\t}\n\t\tthis.broadcastPatch(diff)\n\t}\n\n\t/**\n\t * Work out whether a client we can't reconcile schemas with is running a newer or older SDK\n\t * than us.\n\t */\n\tprivate getVersionMismatchReason(theirSchema: SerializedSchema) {\n\t\tconst ourSchema = this.serializedSchema\n\n\t\tif (theirSchema.schemaVersion > ourSchema.schemaVersion) {\n\t\t\treturn TLSyncErrorCloseEventReason.SERVER_TOO_OLD\n\t\t}\n\n\t\tif (theirSchema.schemaVersion === 2 && ourSchema.schemaVersion === 2) {\n\t\t\tfor (const [sequenceId, theirVersion] of Object.entries(theirSchema.sequences)) {\n\t\t\t\tconst ourVersion = ourSchema.sequences[sequenceId]\n\t\t\t\tif (ourVersion === undefined || theirVersion > ourVersion) {\n\t\t\t\t\treturn TLSyncErrorCloseEventReason.SERVER_TOO_OLD\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\treturn TLSyncErrorCloseEventReason.CLIENT_TOO_OLD\n\t}\n\n\tprivate handleConnectRequest(\n\t\tsession: RoomSession<R, SessionMeta>,\n\t\tmessage: Extract<TLSocketClientSentEvent<R>, { type: 'connect' }>\n\t) {\n\t\t// if the protocol versions don't match, disconnect the client\n\t\t// we will eventually want to try to make our protocol backwards compatible to some degree\n\t\t// and have a MIN_PROTOCOL_VERSION constant that the TLSyncRoom implements support for\n\t\tlet theirProtocolVersion = message.protocolVersion\n\t\t// 5 is the same as 6\n\t\tif (theirProtocolVersion === 5) {\n\t\t\ttheirProtocolVersion = 6\n\t\t}\n\t\t// 6 is almost the same as 7\n\t\tsession.requiresLegacyRejection = theirProtocolVersion === 6\n\t\tif (theirProtocolVersion === 6) {\n\t\t\ttheirProtocolVersion++\n\t\t}\n\t\tif (theirProtocolVersion === 7) {\n\t\t\ttheirProtocolVersion++\n\t\t\tsession.supportsStringAppend = false\n\t\t}\n\n\t\tif (theirProtocolVersion == null || theirProtocolVersion < getTlsyncProtocolVersion()) {\n\t\t\tthis.rejectSession(session.sessionId, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\treturn\n\t\t} else if (theirProtocolVersion > getTlsyncProtocolVersion()) {\n\t\t\tthis.rejectSession(session.sessionId, TLSyncErrorCloseEventReason.SERVER_TOO_OLD)\n\t\t\treturn\n\t\t}\n\t\t// If the client's store is at a different version to ours, it could cause corruption.\n\t\t// We should disconnect the client and ask them to refresh.\n\t\tif (message.schema == null) {\n\t\t\tthis.rejectSession(session.sessionId, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\treturn\n\t\t}\n\t\tconst migrations = this.schema.getMigrationsSince(message.schema)\n\t\tif (!migrations.ok) {\n\t\t\tthis.rejectSession(session.sessionId, this.getVersionMismatchReason(message.schema))\n\t\t\treturn\n\t\t}\n\t\t// The client's schema is older than ours, but we can't migrate our data down to their\n\t\t// version (a migration isn't record-scoped or has no down migration), so they're too old.\n\t\tif (migrations.value.some((m) => m.scope !== 'record' || !m.down)) {\n\t\t\tthis.rejectSession(session.sessionId, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\treturn\n\t\t}\n\n\t\tconst sessionSchema = isEqual(message.schema, this.serializedSchema)\n\t\t\t? this.serializedSchema\n\t\t\t: message.schema\n\n\t\tconst requiresDownMigrations = migrations.value.length > 0\n\n\t\tconst connect = (msg: Extract<TLSocketServerSentEvent<R>, { type: 'connect' }>) => {\n\t\t\tthis.sessions.set(session.sessionId, {\n\t\t\t\tstate: RoomSessionState.Connected,\n\t\t\t\tsessionId: session.sessionId,\n\t\t\t\tpresenceId: session.presenceId,\n\t\t\t\tsocket: session.socket,\n\t\t\t\tserializedSchema: sessionSchema,\n\t\t\t\trequiresDownMigrations,\n\t\t\t\tlastInteractionTime: Date.now(),\n\t\t\t\tdebounceTimer: null,\n\t\t\t\toutstandingDataMessages: [],\n\t\t\t\tsupportsStringAppend: session.supportsStringAppend,\n\t\t\t\tmeta: session.meta,\n\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\tobjectAccess: session.objectAccess,\n\t\t\t\trequiresLegacyRejection: session.requiresLegacyRejection,\n\t\t\t})\n\t\t\tthis._unsafe_sendMessage(session.sessionId, msg)\n\t\t}\n\n\t\tconst { documentClock, result } = this.storage.transaction((txn) => {\n\t\t\tthis.broadcastChanges(txn)\n\t\t\tconst docChanges = txn.getChangesSince(message.lastServerClock)\n\t\t\tconst presenceDiff = this.migrateDiffOrRejectSession(\n\t\t\t\tsession.sessionId,\n\t\t\t\tsessionSchema,\n\t\t\t\trequiresDownMigrations,\n\t\t\t\t{\n\t\t\t\t\t// Exclude the connecting session's own presence \u2014 it will push fresh\n\t\t\t\t\t// data immediately after connecting. Sending the stale record back\n\t\t\t\t\t// would leave an orphaned presence in the client's local store (the\n\t\t\t\t\t// server never echoes a session's own updates back to it).\n\t\t\t\t\tputs: Object.fromEntries(\n\t\t\t\t\t\t[...this.presenceStore.values()]\n\t\t\t\t\t\t\t.filter((p) => p.id !== session.presenceId)\n\t\t\t\t\t\t\t.map((p) => [p.id, p])\n\t\t\t\t\t),\n\t\t\t\t\tdeletes: [],\n\t\t\t\t}\n\t\t\t)\n\t\t\tif (!presenceDiff.ok) return null\n\n\t\t\t// Migrate the diff if needed, or use the pre-computed network diff\n\t\t\tlet docDiff: NetworkDiff<R> | null = null\n\t\t\tif (docChanges && sessionSchema !== this.serializedSchema) {\n\t\t\t\tconst migrated = this.migrateDiffOrRejectSession(\n\t\t\t\t\tsession.sessionId,\n\t\t\t\t\tsessionSchema,\n\t\t\t\t\trequiresDownMigrations,\n\t\t\t\t\tdocChanges.diff\n\t\t\t\t)\n\t\t\t\tif (!migrated.ok) return null\n\t\t\t\tdocDiff = migrated.value\n\t\t\t} else if (docChanges) {\n\t\t\t\tdocDiff = toNetworkDiff(docChanges.diff)\n\t\t\t}\n\t\t\treturn {\n\t\t\t\ttype: 'connect',\n\t\t\t\tconnectRequestId: message.connectRequestId,\n\t\t\t\thydrationType: docChanges?.wipeAll ? 'wipe_all' : 'wipe_presence',\n\t\t\t\tprotocolVersion: getTlsyncProtocolVersion(),\n\t\t\t\tschema: this.schema.serialize(),\n\t\t\t\tserverClock: txn.getClock(),\n\t\t\t\tdiff: { ...presenceDiff.value, ...docDiff },\n\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\tobjectAccess: session.objectAccess,\n\t\t\t} satisfies Extract<TLSocketServerSentEvent<R>, { type: 'connect' }>\n\t\t}) // no id needed because this only reads, no writes.\n\n\t\tthis.lastDocumentClock = documentClock\n\n\t\tif (result) {\n\t\t\tconnect(result)\n\t\t}\n\t}\n\n\tprivate handlePushRequest(\n\t\tsession: RoomSession<R, SessionMeta> | null,\n\t\tmessage: Extract<TLSocketClientSentEvent<R>, { type: 'push' }>\n\t) {\n\t\t// We must be connected to handle push requests\n\t\tif (session && session.state !== RoomSessionState.Connected) {\n\t\t\treturn\n\t\t}\n\t\t// update the last interaction time\n\t\tif (session) {\n\t\t\tsession.lastInteractionTime = Date.now()\n\t\t}\n\n\t\tconst legacyAppendMode = !this.getCanEmitStringAppend()\n\n\t\tinterface ActualChanges {\n\t\t\tdiffs: {\n\t\t\t\tnetworkDiff: NetworkDiff<R>\n\t\t\t\tdiff: TLSyncForwardDiff<R>\n\t\t\t} | null\n\t\t}\n\n\t\tconst propagateOp = (\n\t\t\tchanges: ActualChanges,\n\t\t\tid: string,\n\t\t\top: RecordOp<R>,\n\t\t\tbefore: R | undefined,\n\t\t\tafter: R | undefined\n\t\t) => {\n\t\t\tif (!changes.diffs) changes.diffs = { networkDiff: {}, diff: { puts: {}, deletes: [] } }\n\t\t\tchanges.diffs.networkDiff[id] = op\n\t\t\tswitch (op[0]) {\n\t\t\t\tcase RecordOpType.Put:\n\t\t\t\t\tchanges.diffs.diff.puts[id] = op[1]\n\t\t\t\t\tbreak\n\t\t\t\tcase RecordOpType.Patch:\n\t\t\t\t\tassert(before && after, 'before and after are required for patches')\n\t\t\t\t\tchanges.diffs.diff.puts[id] = [before, after]\n\t\t\t\t\tbreak\n\t\t\t\tcase RecordOpType.Remove:\n\t\t\t\t\tchanges.diffs.diff.deletes.push(id)\n\t\t\t\t\tbreak\n\t\t\t\tdefault:\n\t\t\t\t\texhaustiveSwitchError(op[0])\n\t\t\t}\n\t\t}\n\n\t\tconst addDocument = (\n\t\t\tstorage: MinimalDocStore<R>,\n\t\t\tchanges: ActualChanges,\n\t\t\tid: string,\n\t\t\t_state: R,\n\t\t\tauthorize?: (prev: R | null, next: R) => R | null,\n\t\t\t// The existing document if the caller already fetched it; `null` for fetched-and-absent,\n\t\t\t// `undefined` for not fetched. Saves a second SELECT + JSON.parse on the push hot path.\n\t\t\tprevDoc?: R | null\n\t\t): Result<void, void> => {\n\t\t\tconst res = session\n\t\t\t\t? this.schema.migratePersistedRecord(_state, session.serializedSchema, 'up')\n\t\t\t\t: { type: 'success' as const, value: _state }\n\t\t\tif (res.type === 'error') {\n\t\t\t\tthrow new TLSyncError(res.reason, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\t}\n\t\t\tlet { value: state } = res\n\n\t\t\t// Get the existing document, if any\n\t\t\tconst doc =\n\t\t\t\tprevDoc !== undefined ? (prevDoc ?? undefined) : (storage.get(id) as R | undefined)\n\n\t\t\t// Authorize on the up-migrated record; on create the authorizer's return is stored as-is,\n\t\t\t// so no later migration can clobber stamped fields.\n\t\t\tif (authorize) {\n\t\t\t\tconst result = authorize(doc ?? null, state)\n\t\t\t\tif (!result) return Result.ok(undefined) // vetoed: skip the op, the client self-corrects\n\t\t\t\tif (!doc) state = result // create: store the authorizer's (stamped) record\n\t\t\t}\n\n\t\t\tif (doc) {\n\t\t\t\t// If there's an existing document, replace it with the new state\n\t\t\t\t// but propagate a diff rather than the entire value\n\t\t\t\tconst recordType = assertExists(getOwnProperty(this.schema.types, doc.typeName))\n\t\t\t\tconst diff = diffAndValidateRecord(doc, state, recordType)\n\t\t\t\tif (diff) {\n\t\t\t\t\tstorage.set(id, state)\n\t\t\t\t\tpropagateOp(changes, id, [RecordOpType.Patch, diff], doc, state)\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Otherwise, if we don't already have a document with this id\n\t\t\t\t// create the document and propagate the put op\n\t\t\t\t// set automatically clears tombstones if they exist\n\t\t\t\tconst recordType = assertExists(getOwnProperty(this.schema.types, state.typeName))\n\t\t\t\tvalidateRecord(state, recordType)\n\t\t\t\tstorage.set(id, state)\n\t\t\t\tpropagateOp(changes, id, [RecordOpType.Put, state], undefined, undefined)\n\t\t\t}\n\n\t\t\treturn Result.ok(undefined)\n\t\t}\n\n\t\tconst patchDocument = (\n\t\t\tstorage: MinimalDocStore<R>,\n\t\t\tchanges: ActualChanges,\n\t\t\tid: string,\n\t\t\tpatch: ObjectDiff,\n\t\t\tauthorize?: (prev: R, next: R) => R | null,\n\t\t\t// The existing document if the caller already fetched it (see `addDocument`).\n\t\t\tprevDoc?: R\n\t\t) => {\n\t\t\t// if it was already deleted, there's no need to apply the patch\n\t\t\tconst doc = prevDoc ?? (storage.get(id) as R | undefined)\n\t\t\tif (!doc) return\n\n\t\t\tconst recordType = assertExists(getOwnProperty(this.schema.types, doc.typeName))\n\t\t\t// If the client's version of the record is older than ours,\n\t\t\t// we apply the patch to the downgraded version of the record\n\t\t\tconst downgraded = session\n\t\t\t\t? this.schema.migratePersistedRecord(doc, session.serializedSchema, 'down')\n\t\t\t\t: { type: 'success' as const, value: doc }\n\t\t\tif (downgraded.type === 'error') {\n\t\t\t\tthrow new TLSyncError(downgraded.reason, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\t}\n\n\t\t\tif (downgraded.value === doc) {\n\t\t\t\t// If the versions are compatible, apply the patch and propagate the patch op\n\t\t\t\tconst diff = applyAndDiffRecord(doc, patch, recordType, legacyAppendMode)\n\t\t\t\tif (diff) {\n\t\t\t\t\t// Authorize on the committed candidate \u2014 the record that will actually be stored.\n\t\t\t\t\tif (authorize && !authorize(doc, diff[1])) return\n\t\t\t\t\tstorage.set(id, diff[1])\n\t\t\t\t\tpropagateOp(changes, id, [RecordOpType.Patch, diff[0]], doc, diff[1])\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// need to apply the patch to the downgraded version and then upgrade it\n\n\t\t\t\t// apply the patch to the downgraded version\n\t\t\t\tconst patched = applyObjectDiff(downgraded.value, patch)\n\t\t\t\t// then upgrade the patched version and use that as the new state\n\t\t\t\tconst upgraded = session\n\t\t\t\t\t? this.schema.migratePersistedRecord(patched, session.serializedSchema, 'up')\n\t\t\t\t\t: { type: 'success' as const, value: patched }\n\t\t\t\t// If the client's version is too old, we'll hit an error\n\t\t\t\tif (upgraded.type === 'error') {\n\t\t\t\t\tthrow new TLSyncError(upgraded.reason, TLSyncErrorCloseEventReason.CLIENT_TOO_OLD)\n\t\t\t\t}\n\t\t\t\t// replace the state with the upgraded version and propagate the patch op\n\t\t\t\tconst diff = diffAndValidateRecord(doc, upgraded.value, recordType, legacyAppendMode)\n\t\t\t\tif (diff) {\n\t\t\t\t\t// Authorize on the committed candidate \u2014 the upgraded record, not a raw preview.\n\t\t\t\t\tif (authorize && !authorize(doc, upgraded.value)) return\n\t\t\t\t\tstorage.set(id, upgraded.value)\n\t\t\t\t\tpropagateOp(changes, id, [RecordOpType.Patch, diff], doc, upgraded.value)\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tconst { result, documentClock, changes } = this.storage.transaction(\n\t\t\t(txn) => {\n\t\t\t\tthis.broadcastChanges(txn)\n\t\t\t\t// collect actual ops that resulted from the push\n\t\t\t\t// these will be broadcast to other users\n\n\t\t\t\tconst docChanges: ActualChanges = { diffs: null }\n\t\t\t\tconst presenceChanges: ActualChanges = { diffs: null }\n\n\t\t\t\tif (this.presenceType && session?.presenceId && 'presence' in message && message.presence) {\n\t\t\t\t\tif (!session) throw new Error('session is required for presence pushes')\n\t\t\t\t\t// The push request was for the presence scope.\n\t\t\t\t\tconst id = session.presenceId\n\t\t\t\t\tconst [type, val] = message.presence\n\t\t\t\t\tconst { typeName } = this.presenceType\n\t\t\t\t\tswitch (type) {\n\t\t\t\t\t\tcase RecordOpType.Put: {\n\t\t\t\t\t\t\t// Try to put the document. If it fails, stop here.\n\t\t\t\t\t\t\taddDocument(this.presenceStore, presenceChanges, id, {\n\t\t\t\t\t\t\t\t...val,\n\t\t\t\t\t\t\t\tid,\n\t\t\t\t\t\t\t\ttypeName,\n\t\t\t\t\t\t\t})\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t\tcase RecordOpType.Patch: {\n\t\t\t\t\t\t\t// Try to patch the document. If it fails, stop here.\n\t\t\t\t\t\t\tpatchDocument(this.presenceStore, presenceChanges, id, {\n\t\t\t\t\t\t\t\t...val,\n\t\t\t\t\t\t\t\tid: [ValueOpType.Put, id],\n\t\t\t\t\t\t\t\ttypeName: [ValueOpType.Put, typeName],\n\t\t\t\t\t\t\t})\n\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// Per-op write gate: document-lane records are gated by `isReadonly`, object-lane\n\t\t\t\t// records by `objectAccess`. Denied ops are skipped (the client is corrected by the\n\t\t\t\t// resulting discard/rebase push_result, exactly as whole-diff readonly skips were).\n\t\t\t\t// Server-initiated pushes (no session) are always allowed.\n\t\t\t\tconst canWrite = (typeName: string) =>\n\t\t\t\t\t!session ||\n\t\t\t\t\t(this.objectTypes.has(typeName) ? session.objectAccess !== 'read' : !session.isReadonly)\n\n\t\t\t\tif (message.diff) {\n\t\t\t\t\t// The push request was for the document scope.\n\t\t\t\t\tfor (const [id, op] of objectMapEntriesIterable(message.diff!)) {\n\t\t\t\t\t\tswitch (op[0]) {\n\t\t\t\t\t\t\tcase RecordOpType.Put: {\n\t\t\t\t\t\t\t\t// The write gate is checked before type validation so that a denied\n\t\t\t\t\t\t\t\t// session's ops are skipped without rejection, matching the previous\n\t\t\t\t\t\t\t\t// whole-diff readonly behavior.\n\t\t\t\t\t\t\t\tif (!canWrite(op[1].typeName)) continue\n\t\t\t\t\t\t\t\t// Try to add the document.\n\t\t\t\t\t\t\t\t// If we're putting a record with a type that we don't recognize, fail\n\t\t\t\t\t\t\t\tif (\n\t\t\t\t\t\t\t\t\t!this.documentTypes.has(op[1].typeName) &&\n\t\t\t\t\t\t\t\t\t!this.objectTypes.has(op[1].typeName)\n\t\t\t\t\t\t\t\t) {\n\t\t\t\t\t\t\t\t\tthrow new TLSyncError(\n\t\t\t\t\t\t\t\t\t\t'invalid record',\n\t\t\t\t\t\t\t\t\t\tTLSyncErrorCloseEventReason.INVALID_RECORD\n\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\tconst record = op[1]\n\t\t\t\t\t\t\t\t// A put must not change the record's typeName. Two reasons, and the first\n\t\t\t\t\t\t\t\t// applies whether or not authorizers are configured: the write gate above\n\t\t\t\t\t\t\t\t// keyed off the *incoming* typeName, so a swap between lanes (document <->\n\t\t\t\t\t\t\t\t// object) would let a session denied on one lane write through the other by\n\t\t\t\t\t\t\t\t// relabeling an existing record. The second is that the authorizer lookup\n\t\t\t\t\t\t\t\t// also keys off the incoming typeName while the replace path validates\n\t\t\t\t\t\t\t\t// against the stored one, so a swap would consult the wrong authorizer (or\n\t\t\t\t\t\t\t\t// none). Skip it like a veto; the client self-corrects.\n\t\t\t\t\t\t\t\t// `undefined` (no session) means the guard didn't fetch, so addDocument will.\n\t\t\t\t\t\t\t\tconst prevRecord = session ? ((txn.get(id) as R | undefined) ?? null) : undefined\n\t\t\t\t\t\t\t\tif (session && prevRecord && prevRecord.typeName !== record.typeName) {\n\t\t\t\t\t\t\t\t\tthis.log?.warn?.(\n\t\t\t\t\t\t\t\t\t\t'skipping put that changes typeName',\n\t\t\t\t\t\t\t\t\t\t`${prevRecord.typeName} -> ${record.typeName}`,\n\t\t\t\t\t\t\t\t\t\tid,\n\t\t\t\t\t\t\t\t\t\t'session:',\n\t\t\t\t\t\t\t\t\t\tsession.sessionId\n\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t\tcontinue\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t// Per-type authorizer: stamp/veto the write from the session's identity.\n\t\t\t\t\t\t\t\t// Client pushes only; runs inside `addDocument`, on the up-migrated record.\n\t\t\t\t\t\t\t\tlet authorize: ((prev: R | null, next: R) => R | null) | undefined\n\t\t\t\t\t\t\t\tif (session && this.authorizeRecord) {\n\t\t\t\t\t\t\t\t\tconst authorizePut = this.authorizerFor(record.typeName)\n\t\t\t\t\t\t\t\t\tif (authorizePut) {\n\t\t\t\t\t\t\t\t\t\tauthorize = (prevRec, next) => {\n\t\t\t\t\t\t\t\t\t\t\tconst result = authorizePut(\n\t\t\t\t\t\t\t\t\t\t\t\tprevRec\n\t\t\t\t\t\t\t\t\t\t\t\t\t? {\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tsession: {\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tsessionId: session.sessionId,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tmeta: session.meta,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\ttype: 'update',\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tprev: prevRec,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tnext,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t\t\t\t\t: {\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tsession: {\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tsessionId: session.sessionId,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tmeta: session.meta,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\ttype: 'create',\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tprev: null,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\tnext,\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t\t\t\tif (!result) {\n\t\t\t\t\t\t\t\t\t\t\t\tthis.log?.warn?.(\n\t\t\t\t\t\t\t\t\t\t\t\t\t'authorizer vetoed put',\n\t\t\t\t\t\t\t\t\t\t\t\t\trecord.typeName,\n\t\t\t\t\t\t\t\t\t\t\t\t\tid,\n\t\t\t\t\t\t\t\t\t\t\t\t\t'session:',\n\t\t\t\t\t\t\t\t\t\t\t\t\tsession.sessionId\n\t\t\t\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t\t\t\t\treturn null\n\t\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t\t\t// create: store the stamped record; update: allow/veto only\n\t\t\t\t\t\t\t\t\t\t\treturn prevRec ? next : result\n\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t// The guard above already fetched this, so don't hit storage again.\n\t\t\t\t\t\t\t\taddDocument(txn, docChanges, id, record, authorize, prevRecord)\n\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tcase RecordOpType.Patch: {\n\t\t\t\t\t\t\t\tconst doc = txn.get(id) as R | undefined\n\t\t\t\t\t\t\t\t// if it was already deleted, there's no need to apply the patch\n\t\t\t\t\t\t\t\tif (!doc) continue\n\t\t\t\t\t\t\t\tif (!canWrite(doc.typeName)) continue\n\t\t\t\t\t\t\t\t// Per-type authorizer (update, allow/veto only): runs inside `patchDocument`\n\t\t\t\t\t\t\t\t// on the committed candidate, never on a raw client-version preview.\n\t\t\t\t\t\t\t\tconst authorizePatch = session && this.authorizerFor(doc.typeName)\n\t\t\t\t\t\t\t\tconst authorize = authorizePatch\n\t\t\t\t\t\t\t\t\t? (prev: R, next: R) => {\n\t\t\t\t\t\t\t\t\t\t\tconst result = authorizePatch({\n\t\t\t\t\t\t\t\t\t\t\t\tsession: {\n\t\t\t\t\t\t\t\t\t\t\t\t\tsessionId: session.sessionId,\n\t\t\t\t\t\t\t\t\t\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\t\t\t\t\t\t\t\t\t\tmeta: session.meta,\n\t\t\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\t\t\ttype: 'update',\n\t\t\t\t\t\t\t\t\t\t\t\tprev,\n\t\t\t\t\t\t\t\t\t\t\t\tnext,\n\t\t\t\t\t\t\t\t\t\t\t})\n\t\t\t\t\t\t\t\t\t\t\tif (!result) {\n\t\t\t\t\t\t\t\t\t\t\t\tthis.log?.warn?.(\n\t\t\t\t\t\t\t\t\t\t\t\t\t'authorizer vetoed patch',\n\t\t\t\t\t\t\t\t\t\t\t\t\tdoc.typeName,\n\t\t\t\t\t\t\t\t\t\t\t\t\tid,\n\t\t\t\t\t\t\t\t\t\t\t\t\t'session:',\n\t\t\t\t\t\t\t\t\t\t\t\t\tsession.sessionId\n\t\t\t\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t\t\treturn result\n\t\t\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\t\t: undefined\n\t\t\t\t\t\t\t\t// Try to patch the document. If it fails, stop here. The write gate above\n\t\t\t\t\t\t\t\t// already fetched the record, so pass it through.\n\t\t\t\t\t\t\t\tpatchDocument(txn, docChanges, id, op[1], authorize, doc)\n\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\tcase RecordOpType.Remove: {\n\t\t\t\t\t\t\t\tconst doc = txn.get(id) as R | undefined\n\t\t\t\t\t\t\t\tif (!doc) {\n\t\t\t\t\t\t\t\t\t// If the doc was already deleted, don't do anything, no need to propagate a delete op\n\t\t\t\t\t\t\t\t\tcontinue\n\t\t\t\t\t\t\t\t}\n\t\t\t\t\t\t\t\tif (!canWrite(doc.typeName)) continue\n\t\t\t\t\t\t\t\t// Per-type authorizer (delete): veto deletes the session isn't allowed to make,\n\t\t\t\t\t\t\t\t// e.g. deleting someone else's comment. Allow/veto only.\n\t\t\t\t\t\t\t\tconst authorizeRemove = session && this.authorizerFor(doc.typeName)\n\t\t\t\t\t\t\t\tif (\n\t\t\t\t\t\t\t\t\tauthorizeRemove &&\n\t\t\t\t\t\t\t\t\t!authorizeRemove({\n\t\t\t\t\t\t\t\t\t\tsession: {\n\t\t\t\t\t\t\t\t\t\t\tsessionId: session.sessionId,\n\t\t\t\t\t\t\t\t\t\t\tisReadonly: session.isReadonly,\n\t\t\t\t\t\t\t\t\t\t\tmeta: session.meta,\n\t\t\t\t\t\t\t\t\t\t},\n\t\t\t\t\t\t\t\t\t\ttype: 'delete',\n\t\t\t\t\t\t\t\t\t\tprev: doc,\n\t\t\t\t\t\t\t\t\t\tnext: null,\n\t\t\t\t\t\t\t\t\t})\n\t\t\t\t\t\t\t\t) {\n\t\t\t\t\t\t\t\t\tthis.log?.warn?.(\n\t\t\t\t\t\t\t\t\t\t'authorizer vetoed delete',\n\t\t\t\t\t\t\t\t\t\tdoc.typeName,\n\t\t\t\t\t\t\t\t\t\tid,\n\t\t\t\t\t\t\t\t\t\t'session:',\n\t\t\t\t\t\t\t\t\t\tsession.sessionId\n\t\t\t\t\t\t\t\t\t)\n\t\t\t\t\t\t\t\t\tcontinue\n\t\t\t\t\t\t\t\t}\n\n\t\t\t\t\t\t\t\t// Delete the document and propagate the delete op\n\t\t\t\t\t\t\t\t// delete automatically creates tombstones\n\t\t\t\t\t\t\t\ttxn.delete(id)\n\t\t\t\t\t\t\t\tpropagateOp(docChanges, id, op, doc, undefined)\n\t\t\t\t\t\t\t\tbreak\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\treturn { docChanges, presenceChanges }\n\t\t\t},\n\t\t\t{ id: this.internalTxnId, emitChanges: 'when-different' }\n\t\t)\n\n\t\tthis.lastDocumentClock = documentClock\n\n\t\tlet pushResult: TLSocketServerSentEvent<R> | undefined\n\t\tif (changes && session) {\n\t\t\t// txn did not apply verbatim so we should broadcast the actual changes\n\t\t\tresult.docChanges.diffs = { networkDiff: toNetworkDiff(changes) ?? {}, diff: changes }\n\t\t}\n\n\t\tif (isEqual(result.docChanges.diffs?.networkDiff, message.diff)) {\n\t\t\tpushResult = {\n\t\t\t\ttype: 'push_result',\n\t\t\t\tclientClock: message.clientClock,\n\t\t\t\tserverClock: documentClock,\n\t\t\t\taction: 'commit',\n\t\t\t}\n\t\t} else if (!result.docChanges.diffs?.networkDiff) {\n\t\t\tpushResult = {\n\t\t\t\ttype: 'push_result',\n\t\t\t\tclientClock: message.clientClock,\n\t\t\t\tserverClock: documentClock,\n\t\t\t\taction: 'discard',\n\t\t\t}\n\t\t} else if (session) {\n\t\t\t// if recordsDiff is null but diff is not, then there are no clients that need down migrations\n\t\t\t// so we can just use the diff directly\n\t\t\tconst diff = this.migrateDiffOrRejectSession(\n\t\t\t\tsession.sessionId,\n\t\t\t\tsession.serializedSchema,\n\t\t\t\tsession.requiresDownMigrations,\n\t\t\t\tresult.docChanges.diffs.diff,\n\t\t\t\tresult.docChanges.diffs.networkDiff\n\t\t\t)\n\t\t\tif (diff.ok) {\n\t\t\t\tpushResult = {\n\t\t\t\t\ttype: 'push_result',\n\t\t\t\t\tclientClock: message.clientClock,\n\t\t\t\t\tserverClock: documentClock,\n\t\t\t\t\taction: { rebaseWithDiff: diff.value },\n\t\t\t\t}\n\t\t\t}\n\t\t\t// if the difff was not ok then the session was rejected and it's ok to continue without a push result\n\t\t}\n\n\t\tif (session && pushResult) {\n\t\t\tthis._unsafe_sendMessage(session.sessionId, pushResult)\n\t\t}\n\t\tif (result.docChanges.diffs || result.presenceChanges.diffs) {\n\t\t\tthis.broadcastPatch(\n\t\t\t\t{\n\t\t\t\t\tputs: {\n\t\t\t\t\t\t...result.docChanges.diffs?.diff.puts,\n\t\t\t\t\t\t...result.presenceChanges.diffs?.diff.puts,\n\t\t\t\t\t},\n\t\t\t\t\tdeletes: [\n\t\t\t\t\t\t...(result.docChanges.diffs?.diff.deletes ?? []),\n\t\t\t\t\t\t...(result.presenceChanges.diffs?.diff.deletes ?? []),\n\t\t\t\t\t],\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\t...result.docChanges.diffs?.networkDiff,\n\t\t\t\t\t...result.presenceChanges.diffs?.networkDiff,\n\t\t\t\t},\n\t\t\t\tsession?.sessionId\n\t\t\t)\n\t\t}\n\n\t\tif (result.presenceChanges.diffs) {\n\t\t\tqueueMicrotask(() => {\n\t\t\t\tthis.onPresenceChange?.()\n\t\t\t})\n\t\t}\n\n\t\tif (result.docChanges.diffs && this.onCommittedChanges) {\n\t\t\tconst diff = result.docChanges.diffs.diff\n\t\t\tqueueMicrotask(() => {\n\t\t\t\ttry {\n\t\t\t\t\tthis.onCommittedChanges?.({ diff, documentClock })\n\t\t\t\t} catch (e) {\n\t\t\t\t\tthis.log?.error?.('onCommittedChanges threw', e)\n\t\t\t\t}\n\t\t\t})\n\t\t}\n\t}\n\n\t/**\n\t * Handle the event when a client disconnects. Cleans up the session and\n\t * removes any presence information.\n\t *\n\t * @param sessionId - The session that disconnected\n\t * @example\n\t * ```ts\n\t * websocket.onClose(() => {\n\t *   room.handleClose(sessionId)\n\t * })\n\t * ```\n\t */\n\thandleClose(sessionId: string) {\n\t\tthis.cancelSession(sessionId)\n\t}\n}\n\n/** @internal */\nexport interface MinimalDocStore<R extends UnknownRecord> {\n\tget(id: string): UnknownRecord | undefined\n\tset(id: string, record: R): void\n\tdelete(id: string): void\n}\n\n/** @internal */\nexport class PresenceStore<R extends UnknownRecord> implements MinimalDocStore<R> {\n\tprivate readonly presences = new AtomMap<string, R>('presences')\n\n\tget(id: string): UnknownRecord | undefined {\n\t\treturn this.presences.get(id)\n\t}\n\n\tset(id: string, state: R): void {\n\t\tthis.presences.set(id, state)\n\t}\n\n\tdelete(id: string): void {\n\t\tthis.presences.delete(id)\n\t}\n\n\tvalues() {\n\t\treturn this.presences.values()\n\t}\n}\n"],
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