Node.js SDK

For listing workers, functions, triggers, or subscribing to function availability events, see Discover workers, functions, and triggers.

Installation

npm install iii-sdk

Initialization

Creates and returns a connected SDK instance. The WebSocket connection is established automatically — there is no separate connect() call.

import { registerWorker } from 'iii-sdk'

const iii = registerWorker(process.env.III_URL ?? 'ws://localhost:49134', {
  workerName: 'my-worker',
})

Methods

createChannel

Creates a streaming channel pair for worker-to-worker data transfer. Returns a Channel with a local writer/reader and serializable refs that can be passed as fields in the invocation data to other functions. Signature

createChannel(bufferSize: number) => Promise<Channel>

Parameters

Name	Type	Required	Description
`bufferSize`	`number`	Yes	Optional buffer size for the channel (default: 64)

Example

const channel = await iii.createChannel()

// Pass the writer ref to another function
await iii.trigger({
  function_id: 'stream-producer',
  payload: { outputChannel: channel.writerRef },
})

// Read data locally
channel.reader.onMessage((msg) => {
  console.log('Received:', msg)
})

createStream

Creates a new stream implementation. This overrides the default stream implementation. Signature

createStream(streamName: string, stream: IStream<TData>) => void

Parameters

Name	Type	Required	Description
`streamName`	`string`	Yes	The name of the stream
`stream`	`IStream`<TData>	Yes	The stream implementation

Example

const redisStream: IStream<UserSession> = {
  async get({ group_id, item_id }) {
    return JSON.parse(await redis.get(`${group_id}:${item_id}`) ?? 'null')
  },
  async set({ group_id, item_id, data }) {
    const old = await this.get({ stream_name: 'sessions', group_id, item_id })
    await redis.set(`${group_id}:${item_id}`, JSON.stringify(data))
    return { old_value: old ?? undefined, new_value: data }
  },
  async delete({ group_id, item_id }) {
    const old = await this.get({ stream_name: 'sessions', group_id, item_id })
    await redis.del(`${group_id}:${item_id}`)
    return { old_value: old ?? undefined }
  },
  async list({ group_id }) { return [] },
  async listGroups() { return [] },
  async update({ group_id, item_id, ops }) { return { new_value: {} } },
}

iii.createStream('sessions', redisStream)

registerFunction

Registers a new function with a local handler or an HTTP invocation config. Signature

registerFunction(functionId: string, handler: HttpInvocationConfig | RemoteFunctionHandler<any, any>, options: RegisterFunctionOptions) => FunctionRef

Parameters

Name	Type	Required	Description
`functionId`	`string`	Yes	Unique function identifier
`handler`	`HttpInvocationConfig` \| `RemoteFunctionHandler`<any, any>	Yes	Async handler for local execution, or an HTTP invocation config for external functions (Lambda, Cloudflare Workers, etc.)
`options`	`RegisterFunctionOptions`	Yes	Optional function registration options (description, request/response formats, metadata)

Example

// Local handler
const ref = iii.registerFunction(
  'greet',
  async (data: { name: string }) => ({ message: `Hello, ${data.name}!` }),
  { description: 'Returns a greeting' },
)

// HTTP invocation
const lambdaRef = iii.registerFunction(
  'external::my-lambda',
  {
    url: 'https://abc123.lambda-url.us-east-1.on.aws',
    method: 'POST',
    timeout_ms: 30_000,
    auth: { type: 'bearer', token_key: 'LAMBDA_AUTH_TOKEN' },
  },
  { description: 'Proxied Lambda function' },
)

// Later, remove the function
ref.unregister()

registerService

Registers a new service. Signature

registerService(message: RegisterServiceInput) => void

Parameters

Name	Type	Required	Description
`message`	`RegisterServiceInput`	Yes	The service to register

registerTrigger

Registers a new trigger. A trigger is a way to invoke a function when a certain event occurs. Signature

registerTrigger(trigger: RegisterTriggerInput) => Trigger

Parameters

Name	Type	Required	Description
`trigger`	`RegisterTriggerInput`	Yes	The trigger to register

Example

const trigger = iii.registerTrigger({
  type: 'cron',
  function_id: 'my-service::process-batch',
  config: { schedule: '*/5 * * * *' },
})

// Later, remove the trigger
trigger.unregister()

registerTriggerType

Registers a new trigger type. A trigger type is a way to invoke a function when a certain event occurs. Signature

registerTriggerType(triggerType: RegisterTriggerTypeInput, handler: TriggerHandler<TConfig>) => TriggerTypeRef<TConfig>

Parameters

Name	Type	Required	Description
`triggerType`	`RegisterTriggerTypeInput`	Yes	The trigger type to register
`handler`	`TriggerHandler`<TConfig>	Yes	The handler for the trigger type

Example

type CronConfig = { schedule: string }

iii.registerTriggerType<CronConfig>(
  { id: 'cron', description: 'Fires on a cron schedule' },
  {
    async registerTrigger({ id, function_id, config }) {
      startCronJob(id, config.schedule, () =>
        iii.trigger({ function_id, payload: {} }),
      )
    },
    async unregisterTrigger({ id }) {
      stopCronJob(id)
    },
  },
)

shutdown

Gracefully shutdown the iii, cleaning up all resources. Signature

shutdown() => Promise<void>

Example

process.on('SIGTERM', async () => {
  await iii.shutdown()
  process.exit(0)
})

trigger

Invokes a function using a request object. Signature

trigger(request: TriggerRequest<TInput>) => Promise<TOutput>

Parameters

Name	Type	Required	Description
`request`	`TriggerRequest`<TInput>	Yes	The trigger request containing function_id, payload, and optional action/timeout

Example

// Synchronous invocation
const result = await iii.trigger<{ name: string }, { message: string }>({
  function_id: 'greet',
  payload: { name: 'World' },
  timeoutMs: 5000,
})
console.log(result.message) // "Hello, World!"

// Fire-and-forget
await iii.trigger({
  function_id: 'send-email',
  payload: { to: 'user@example.com' },
  action: TriggerAction.Void(),
})

// Enqueue for async processing
const receipt = await iii.trigger({
  function_id: 'process-order',
  payload: { orderId: '123' },
  action: TriggerAction.Enqueue({ queue: 'orders' }),
})

unregisterTriggerType

Unregisters a trigger type. Signature

unregisterTriggerType(triggerType: RegisterTriggerTypeInput) => void

Parameters

Name	Type	Required	Description
`triggerType`	`RegisterTriggerTypeInput`	Yes	The trigger type to unregister

Example

iii.unregisterTriggerType({ id: 'cron', description: 'Fires on a cron schedule' })

Subpath Exports

The iii-sdk package provides additional entry points:

Import path	Contents
`iii-sdk`	`MessageType`, `ChannelReader`, `ChannelWriter`, `Logger`, `ISdk`, `ApiRequest`, `ApiResponse`, `AuthInput`, `AuthResult`, `Channel`, etc.
`iii-sdk/stream`	`IStream`, `StreamAuthInput`, `StreamAuthResult`, `StreamChangeEvent`, `StreamJoinLeaveEvent`, `StreamJoinLeaveTriggerConfig`, `StreamJoinResult`, `StreamTriggerConfig`, `DeleteResult`, `StreamContext`, etc.
`iii-sdk/state`	`StateEventType`, `IState`, `StateEventData`, `DeleteResult`, `StateDeleteInput`, `StateDeleteResult`, `StateGetInput`, `StateListInput`, `StateSetInput`, `StateSetResult`, etc.
`iii-sdk/telemetry`	`WorkerMetricsCollector`, `IIIReconnectionConfig`, `OtelConfig`, `ReconnectionConfig`, `WorkerGaugesOptions`, `WorkerMetricsCollectorOptions`, `IIIConnectionState`, `OtelLogEvent`, `RegisterFunctionFormat`, `WorkerMetrics`, etc.

Logger

Structured logger that emits logs as OpenTelemetry LogRecords. Every log call automatically captures the active trace and span context, correlating your logs with distributed traces without any manual wiring. When OTel is not initialized, Logger gracefully falls back to console.*. Pass structured data as the second argument to any log method. Using an object of key-value pairs (instead of string interpolation) lets you filter, aggregate, and build dashboards in your observability backend.

debug

Log a debug-level message. Signature

debug(message: string, data: unknown) => void

Parameters

Name	Type	Required	Description
`message`	`string`	Yes	Human-readable log message.
`data`	`unknown`	Yes	Structured context attached as OTel log attributes. Use key-value objects to enable filtering and aggregation in your observability backend (e.g. Grafana, Datadog, New Relic).

Example

logger.debug('Cache lookup', { key: 'user:42', hit: false })

error

Log an error-level message. Signature

error(message: string, data: unknown) => void

Parameters

Name	Type	Required	Description
`message`	`string`	Yes	Human-readable log message.
`data`	`unknown`	Yes	Structured context attached as OTel log attributes. Use key-value objects to enable filtering and aggregation in your observability backend (e.g. Grafana, Datadog, New Relic).

Example

logger.error('Payment failed', { orderId: 'ord_123', gateway: 'stripe', errorCode: 'card_declined' })

info

Log an info-level message. Signature

info(message: string, data: unknown) => void

Parameters

Name	Type	Required	Description
`message`	`string`	Yes	Human-readable log message.
`data`	`unknown`	Yes	Structured context attached as OTel log attributes. Use key-value objects to enable filtering and aggregation in your observability backend (e.g. Grafana, Datadog, New Relic).

Example

logger.info('Order processed', { orderId: 'ord_123', status: 'completed' })

warn

Log a warning-level message. Signature

warn(message: string, data: unknown) => void

Parameters

Name	Type	Required	Description
`message`	`string`	Yes	Human-readable log message.
`data`	`unknown`	Yes	Structured context attached as OTel log attributes. Use key-value objects to enable filtering and aggregation in your observability backend (e.g. Grafana, Datadog, New Relic).

Example

logger.warn('Retry attempt', { attempt: 3, maxRetries: 5, endpoint: '/api/charge' })

Types

MessageType · ChannelReader · ChannelWriter · Channel · FunctionRef · HttpAuthConfig · HttpInvocationConfig · InitOptions · RegisterFunctionMessage · RegisterFunctionOptions · RegisterServiceInput · RegisterTriggerInput · RegisterTriggerMessage · RegisterTriggerTypeInput · RegisterTriggerTypeMessage · RemoteFunctionHandler · StreamChannelRef · Trigger · TriggerHandler · TriggerRequest · TriggerTypeRef · IStream · DeleteResult · StreamSetResult · StreamUpdateResult · DeleteResult · IIIReconnectionConfig · OtelConfig · ReconnectionConfig · RegisterFunctionFormat

MessageType

Name	Type	Required	Description
`InvocationResult`	`"invocationresult"`	Yes	-
`InvokeFunction`	`"invokefunction"`	Yes	-
`RegisterFunction`	`"registerfunction"`	Yes	-
`RegisterService`	`"registerservice"`	Yes	-
`RegisterTrigger`	`"registertrigger"`	Yes	-
`RegisterTriggerType`	`"registertriggertype"`	Yes	-
`TriggerRegistrationResult`	`"triggerregistrationresult"`	Yes	-
`UnregisterFunction`	`"unregisterfunction"`	Yes	-
`UnregisterTrigger`	`"unregistertrigger"`	Yes	-
`UnregisterTriggerType`	`"unregistertriggertype"`	Yes	-
`WorkerRegistered`	`"workerregistered"`	Yes	-

ChannelReader

Read end of a streaming channel. Provides both a Node.js Readable stream for binary data and an onMessage callback for structured text messages.

Name	Type	Required	Description
`stream`	`Readable`	Yes	Node.js Readable stream for binary data.

ChannelWriter

Write end of a streaming channel. Provides both a Node.js Writable stream and a sendMessage method for sending structured text messages.

Name	Type	Required	Description
`stream`	`Writable`	Yes	Node.js Writable stream for binary data.

Channel

A streaming channel pair for worker-to-worker data transfer. Created via ISdk.createChannel.

Name	Type	Required	Description
`reader`	`ChannelReader`	Yes	Reader end of the channel.
`readerRef`	`StreamChannelRef`	Yes	Serializable reference to the reader (can be sent to other workers).
`writer`	`ChannelWriter`	Yes	Writer end of the channel.
`writerRef`	`StreamChannelRef`	Yes	Serializable reference to the writer (can be sent to other workers).

FunctionRef

Handle returned by ISdk.registerFunction. Contains the function’s id and an unregister() method.

Name	Type	Required	Description
`id`	`string`	Yes	The unique function identifier.
`unregister`	`() => void`	Yes	Removes this function from the engine.

HttpAuthConfig

Authentication configuration for HTTP-invoked functions.

hmac — HMAC signature verification using a shared secret.
bearer — Bearer token authentication.
api_key — API key sent via a custom header.

type HttpAuthConfig = unknown | unknown | unknown

HttpInvocationConfig

Configuration for registering an HTTP-invoked function (Lambda, Cloudflare Workers, etc.) instead of a local handler.

Name	Type	Required	Description
`auth`	`HttpAuthConfig`	No	Authentication configuration.
`headers`	`Record<string, string>`	No	Custom headers to send with the request.
`method`	`"GET" \| "POST" \| "PUT" \| "PATCH" \| "DELETE"`	No	HTTP method. Defaults to `POST`.
`timeout_ms`	`number`	No	Timeout in milliseconds.
`url`	`string`	Yes	URL to invoke.

InitOptions

Configuration options passed to registerWorker.

Name	Type	Required	Description
`enableMetricsReporting`	`boolean`	No	Enable worker metrics via OpenTelemetry. Defaults to `true`.
`headers`	`Record<string, string>`	No	Custom HTTP headers sent during the WebSocket handshake.
`invocationTimeoutMs`	`number`	No	Default timeout for `trigger()` in milliseconds. Defaults to `30000`.
`otel`	Omit<`OtelConfig`, “engineWsUrl”>	No	OpenTelemetry configuration. OTel is initialized automatically by default. Set `{ enabled: false }` or env `OTEL_ENABLED=false/0/no/off` to disable. The `engineWsUrl` is set automatically from the III address.
`reconnectionConfig`	Partial<`IIIReconnectionConfig`>	No	WebSocket reconnection behavior.
`workerName`	`string`	No	Display name for this worker. Defaults to `hostname:pid`.

RegisterFunctionMessage

Name	Type	Required	Description
`description`	`string`	No	The description of the function
`id`	`string`	Yes	The path of the function (use :: for namespacing, e.g. external::my_lambda)
`invocation`	`HttpInvocationConfig`	No	HTTP invocation config for external HTTP functions (Lambda, Cloudflare Workers, etc.)
`message_type`	`MessageType`.RegisterFunction	Yes	-
`metadata`	`Record<string, unknown>`	No	-
`request_format`	`RegisterFunctionFormat`	No	The request format of the function
`response_format`	`RegisterFunctionFormat`	No	The response format of the function

RegisterFunctionOptions

type RegisterFunctionOptions = Omit<RegisterFunctionMessage, "message_type" | "id">

RegisterServiceInput

type RegisterServiceInput = Omit<RegisterServiceMessage, "message_type">

RegisterTriggerInput

type RegisterTriggerInput = Omit<RegisterTriggerMessage, "message_type" | "id">

RegisterTriggerMessage

Name	Type	Required	Description
`config`	`unknown`	Yes	-
`function_id`	`string`	Yes	-
`id`	`string`	Yes	-
`message_type`	`MessageType`.RegisterTrigger	Yes	-
`metadata`	`Record<string, unknown>`	No	-
`type`	`string`	Yes	-

RegisterTriggerTypeInput

type RegisterTriggerTypeInput = Omit<RegisterTriggerTypeMessage, "message_type">

RegisterTriggerTypeMessage

Name	Type	Required	Description
`description`	`string`	Yes	-
`id`	`string`	Yes	-
`message_type`	`MessageType`.RegisterTriggerType	Yes	-

RemoteFunctionHandler

Async function handler for a registered function. Receives the invocation payload and returns the result.

type RemoteFunctionHandler = (data: TInput) => Promise<TOutput>

StreamChannelRef

Serializable reference to one end of a streaming channel. Can be included in invocation payloads to pass channel endpoints between workers.

Name	Type	Required	Description
`access_key`	`string`	Yes	Access key for authentication.
`channel_id`	`string`	Yes	Unique channel identifier.
`direction`	`"read" \| "write"`	Yes	Whether this ref is for reading or writing.

Trigger

Handle returned by ISdk.registerTrigger. Use unregister() to remove the trigger from the engine.

Name	Type	Required	Description
`unregister`	`void`	Yes	Removes this trigger from the engine.

TriggerHandler

Handler interface for custom trigger types. Passed to ISdk.registerTriggerType.

Name	Type	Required	Description
`registerTrigger`	`Promise<void>`	Yes	Called when a trigger instance is registered.
`unregisterTrigger`	`Promise<void>`	Yes	Called when a trigger instance is unregistered.

TriggerRequest

Request object passed to ISdk.trigger.

Name	Type	Required	Description
`action`	`TriggerAction`	No	Routing action. Omit for synchronous request/response.
`function_id`	`string`	Yes	ID of the function to invoke.
`payload`	`TInput`	Yes	Payload to pass to the function.
`timeoutMs`	`number`	No	Override the default invocation timeout in milliseconds.

TriggerTypeRef

Typed handle returned by ISdk.registerTriggerType. Provides convenience methods to register triggers and functions scoped to this trigger type, so callers don’t need to repeat the type field.

Name	Type	Required	Description
`id`	`string`	Yes	The trigger type identifier.
`registerFunction`	`FunctionRef`	Yes	Register a function and immediately bind it to this trigger type.
`registerTrigger`	`Trigger`	Yes	Register a trigger bound to this trigger type.
`unregister`	`void`	Yes	Unregister this trigger type from the engine.

IStream

Interface for custom stream implementations. Passed to ISdk.createStream to override the engine’s built-in stream storage.

Name	Type	Required	Description
`delete`	Promise<`DeleteResult`>	Yes	Delete a stream item.
`get`	`Promise<TData \| null>`	Yes	Retrieve a single item by group and item ID.
`list`	`Promise<TData[]>`	Yes	List all items in a group.
`listGroups`	`Promise<string[]>`	Yes	List all group IDs in a stream.
`set`	Promise<`StreamSetResult`<TData> \| null>	Yes	Set (create or overwrite) a stream item.
`update`	Promise<`StreamUpdateResult`<TData> \| null>	Yes	Apply atomic update operations to a stream item.

DeleteResult

Result of a stream delete operation.

Name	Type	Required	Description
`old_value`	`any`	No	Previous value (if it existed).

StreamSetResult

Result of a stream set operation.

Name	Type	Required	Description
`new_value`	`TData`	Yes	New value that was stored.
`old_value`	`TData`	No	Previous value (if it existed).

StreamUpdateResult

Result of a stream update operation.

Name	Type	Required	Description
`new_value`	`TData`	Yes	New value after the update.
`old_value`	`TData`	No	Previous value (if it existed).

DeleteResult

Result of a state delete operation.

Name	Type	Required	Description
`old_value`	`any`	No	Previous value (if it existed).

IIIReconnectionConfig

Configuration for WebSocket reconnection behavior

Name	Type	Required	Description
`backoffMultiplier`	`number`	Yes	Exponential backoff multiplier (default: 2)
`initialDelayMs`	`number`	Yes	Starting delay in milliseconds (default: 1000ms)
`jitterFactor`	`number`	Yes	Random jitter factor 0-1 (default: 0.3)
`maxDelayMs`	`number`	Yes	Maximum delay cap in milliseconds (default: 30000ms)
`maxRetries`	`number`	Yes	Maximum retry attempts, -1 for infinite (default: -1)

OtelConfig

Configuration for OpenTelemetry initialization.

Name	Type	Required	Description
`enabled`	`boolean`	No	Whether OpenTelemetry export is enabled. Defaults to true. Set to false or OTEL_ENABLED=false/0/no/off to disable.
`engineWsUrl`	`string`	No	III Engine WebSocket URL. Defaults to III_URL or “ws://localhost:49134”.
`fetchInstrumentationEnabled`	`boolean`	No	Whether to auto-instrument globalThis.fetch calls. Defaults to true. Works on Node.js, Bun, and Deno. Set to false to disable.
`instrumentations`	`Instrumentation<InstrumentationConfig>[]`	No	OpenTelemetry instrumentations to register (e.g., PrismaInstrumentation).
`logsBatchSize`	`number`	No	Maximum number of log records exported per batch. Defaults to 1.
`logsFlushIntervalMs`	`number`	No	Log processor flush delay in milliseconds. Defaults to 100ms.
`metricsEnabled`	`boolean`	No	Whether OpenTelemetry metrics export is enabled. Defaults to true. Set to false or OTEL_METRICS_ENABLED=false/0/no/off to disable.
`metricsExportIntervalMs`	`number`	No	Metrics export interval in milliseconds. Defaults to 60000 (60 seconds).
`reconnectionConfig`	Partial<`ReconnectionConfig`>	No	Optional reconnection configuration for the WebSocket connection.
`serviceInstanceId`	`string`	No	The service instance ID to report. Defaults to SERVICE_INSTANCE_ID env var or auto-generated UUID.
`serviceName`	`string`	No	The service name to report. Defaults to OTEL_SERVICE_NAME or “iii-node”.
`serviceNamespace`	`string`	No	The service namespace to report. Defaults to SERVICE_NAMESPACE env var.
`serviceVersion`	`string`	No	The service version to report. Defaults to SERVICE_VERSION env var or “unknown”.

ReconnectionConfig

Configuration for WebSocket reconnection behavior

Name	Type	Required	Description
`backoffMultiplier`	`number`	Yes	Exponential backoff multiplier (default: 2)
`initialDelayMs`	`number`	Yes	Starting delay in milliseconds (default: 1000ms)
`jitterFactor`	`number`	Yes	Random jitter factor 0-1 (default: 0.3)
`maxDelayMs`	`number`	Yes	Maximum delay cap in milliseconds (default: 30000ms)
`maxRetries`	`number`	Yes	Maximum retry attempts, -1 for infinite (default: -1)

RegisterFunctionFormat

Name	Type	Required	Description
`description`	`string`	No	The description of the parameter
`items`	`unknown`	No	The items of the parameter (for arrays)
`name`	`string`	No	The name of the parameter
`properties`	`Record<string, unknown>`	No	The body of the parameter (for objects)
`required`	`string[]`	No	Whether the parameter is required
`type`	`"string" \| "number" \| "boolean" \| "object" \| "array" \| "null" \| "map" \| "integer"`	No	The type of the parameter

SDKs

​Installation

​Initialization

​Methods

​createChannel

​Parameters

​Example

​createStream

​Parameters

​Example

​registerFunction

​Parameters

​Example

​registerService

​Parameters

​registerTrigger

​Parameters

​Example

​registerTriggerType

​Parameters

​Example

​shutdown

​Example

​trigger

​Parameters

​Example

​unregisterTriggerType

​Parameters

​Example

​Subpath Exports

​Logger

​debug

​Parameters

​Example

​error

​Parameters

​Example

​info

​Parameters

​Example

​warn

​Parameters

​Example

​Types

​MessageType

​ChannelReader

​ChannelWriter

​Channel

​FunctionRef

​HttpAuthConfig

​HttpInvocationConfig

​InitOptions

​RegisterFunctionMessage

​RegisterFunctionOptions

​RegisterServiceInput

​RegisterTriggerInput

​RegisterTriggerMessage

​RegisterTriggerTypeInput

​RegisterTriggerTypeMessage

​RemoteFunctionHandler

​StreamChannelRef

​Trigger

​TriggerHandler

​TriggerRequest

​TriggerTypeRef

​IStream

​DeleteResult

​StreamSetResult

​StreamUpdateResult

​DeleteResult

​IIIReconnectionConfig

​OtelConfig

​ReconnectionConfig

​RegisterFunctionFormat

Installation

Initialization

Methods

createChannel

Parameters

Example

createStream

Parameters

Example

registerFunction

Parameters

Example

registerService

Parameters

registerTrigger

Parameters

Example

registerTriggerType

Parameters

Example

shutdown

Example

trigger

Parameters

Example

unregisterTriggerType

Parameters

Example

Subpath Exports

Logger

debug

Parameters

Example

error

Parameters

Example

info

Parameters

Example

warn

Parameters

Example

Types

MessageType

ChannelReader

ChannelWriter

Channel

FunctionRef

HttpAuthConfig

HttpInvocationConfig

InitOptions

RegisterFunctionMessage

RegisterFunctionOptions

RegisterServiceInput

RegisterTriggerInput

RegisterTriggerMessage

RegisterTriggerTypeInput

RegisterTriggerTypeMessage

RemoteFunctionHandler

StreamChannelRef

Trigger

TriggerHandler

TriggerRequest

TriggerTypeRef

IStream

DeleteResult

StreamSetResult

StreamUpdateResult

DeleteResult

IIIReconnectionConfig

OtelConfig

ReconnectionConfig

RegisterFunctionFormat