{"version":3,"file":"define-Yxp4bcq5.mjs","names":["#url","#opts","#abort","#listeners","#startPromise","#resolveStart","#pump","#run","#resolveConnectionWaiters","#connections","#connectionsWaiters","#connectOnce","#readBody","#emit","#dispatch","#eventType","#data","#eventId"],"sources":["../src/channels/configure.ts","../src/channels/sse-reader.ts","../src/channels.ts","../src/tako/error.ts","../src/workflows/define.ts"],"sourcesContent":["type TokenResolver = () => string | null | Promise;\n\ninterface ChannelsConfig {\n token: TokenResolver | null;\n fetch: typeof fetch;\n websocket: typeof WebSocket;\n}\n\nfunction defaultFetch(): typeof fetch {\n if (typeof globalThis.fetch !== \"function\") {\n throw new Error(\"fetch is not available; pass configureChannels({ fetch }).\");\n }\n return globalThis.fetch.bind(globalThis);\n}\n\nfunction defaultWebSocket(): typeof WebSocket {\n if (typeof globalThis.WebSocket !== \"function\") {\n throw new Error(\"WebSocket is not available; pass configureChannels({ websocket }).\");\n }\n return globalThis.WebSocket;\n}\n\nfunction makeDefaultConfig(): ChannelsConfig {\n return {\n token: null,\n fetch: defaultFetch(),\n websocket: defaultWebSocket(),\n };\n}\n\nlet current: ChannelsConfig | null = null;\n\nfunction getCurrent(): ChannelsConfig {\n current ??= makeDefaultConfig();\n return current;\n}\n\nexport function configureChannels(\n input: Partial<{\n token: TokenResolver;\n fetch: typeof fetch;\n websocket: typeof WebSocket;\n }>,\n): void {\n current = {\n ...getCurrent(),\n ...input,\n };\n}\n\nexport function resetChannelsConfig(): void {\n current = null;\n}\n\nexport function getChannelsConfig(): {\n fetch: typeof fetch;\n websocket: typeof WebSocket;\n resolveToken(): Promise;\n resolveOptionalToken(): Promise;\n} {\n const config = getCurrent();\n return {\n fetch: config.fetch,\n websocket: config.websocket,\n async resolveToken() {\n if (!config.token) {\n throw new Error(\"configureChannels({ token }) is required for header-auth channels.\");\n }\n const token = await config.token();\n if (!token) {\n throw new Error(\"configureChannels token resolver returned null.\");\n }\n return token;\n },\n async resolveOptionalToken() {\n if (!config.token) return null;\n const token = await config.token();\n return token || null;\n },\n };\n}\n","export interface SseReaderMessage {\n id?: string;\n type?: string;\n data: string;\n}\n\nexport interface SseReaderOptions {\n fetch?: typeof fetch;\n headers?: Record;\n onMessage: (message: SseReaderMessage) => void;\n onOpen?: () => void;\n onError?: (error: Error) => void;\n signal?: AbortSignal;\n backoffBaseMs?: number;\n backoffMaxMs?: number;\n jitter?: number;\n retryOnDisconnect?: boolean;\n}\n\ninterface DrainOptions {\n connections?: number;\n}\n\ntype Listener = EventListenerOrEventListenerObject;\n\nexport class SseReader {\n lastEventId: string | undefined;\n\n readonly #url: string;\n readonly #opts: SseReaderOptions;\n readonly #abort = new AbortController();\n readonly #listeners = new Map>();\n #pump: Promise | null = null;\n #connections = 0;\n #connectionsWaiters: Array<() => void> = [];\n #startPromise: Promise | null = null;\n #resolveStart: (() => void) | null = null;\n\n constructor(url: string, opts: SseReaderOptions) {\n this.#url = url;\n this.#opts = opts;\n if (opts.signal) {\n if (opts.signal.aborted) {\n this.#abort.abort();\n } else {\n opts.signal.addEventListener(\"abort\", () => this.close(), { once: true });\n }\n }\n }\n\n start(): Promise {\n if (!this.#startPromise) {\n this.#startPromise = new Promise((resolve) => {\n this.#resolveStart = resolve;\n });\n this.#pump = this.#run();\n }\n return this.#startPromise;\n }\n\n close(): void {\n this.#abort.abort();\n this.#resolveConnectionWaiters();\n }\n\n addEventListener(type: string, listener: Listener | null): void {\n if (!listener) {\n return;\n }\n let listeners = this.#listeners.get(type);\n if (!listeners) {\n listeners = new Set();\n this.#listeners.set(type, listeners);\n }\n listeners.add(listener);\n }\n\n removeEventListener(type: string, listener: Listener | null): void {\n if (!listener) {\n return;\n }\n this.#listeners.get(type)?.delete(listener);\n }\n\n dispatchEvent(event: Event): boolean {\n const listeners = this.#listeners.get(event.type);\n if (!listeners) {\n return true;\n }\n for (const listener of listeners) {\n if (typeof listener === \"function\") {\n listener.call(this, event);\n } else {\n listener.handleEvent(event);\n }\n }\n return true;\n }\n\n async drain(options: DrainOptions = {}): Promise {\n const targetConnections = options.connections;\n if (targetConnections !== undefined) {\n while (!this.#abort.signal.aborted && this.#connections < targetConnections) {\n await new Promise((resolve) => this.#connectionsWaiters.push(resolve));\n }\n this.close();\n }\n await this.#pump;\n }\n\n async #run(): Promise {\n let attempt = 0;\n while (!this.#abort.signal.aborted) {\n try {\n await this.#connectOnce();\n if (this.#abort.signal.aborted) {\n this.#resolveStart?.();\n return;\n }\n if (!this.#opts.retryOnDisconnect) {\n this.#resolveStart?.();\n return;\n }\n attempt = 0;\n const err = new Error(\"SSE stream disconnected; reconnecting.\");\n this.#opts.onError?.(err);\n this.dispatchEvent(new ErrorEvent(\"error\", { error: err, message: err.message }));\n } catch (error) {\n if (this.#abort.signal.aborted) {\n this.#resolveStart?.();\n return;\n }\n const err = asError(error);\n this.#opts.onError?.(err);\n this.dispatchEvent(new ErrorEvent(\"error\", { error: err, message: err.message }));\n if (!this.#opts.retryOnDisconnect) {\n this.#resolveStart?.();\n return;\n }\n }\n\n attempt++;\n await delay(backoff(attempt, this.#opts), this.#abort.signal);\n }\n this.#resolveStart?.();\n }\n\n async #connectOnce(): Promise {\n const fetchImpl = this.#opts.fetch ?? globalThis.fetch;\n const headers = new Headers(this.#opts.headers);\n if (this.lastEventId !== undefined) {\n headers.set(\"Last-Event-ID\", this.lastEventId);\n }\n\n const response = await fetchImpl(this.#url, {\n headers,\n signal: this.#abort.signal,\n });\n if (!response.ok) {\n throw new Error(`SSE request failed with status ${response.status}.`);\n }\n if (!response.body) {\n throw new Error(\"SSE response body is not readable.\");\n }\n\n this.#connections++;\n this.#resolveConnectionWaiters();\n this.#resolveStart?.();\n this.#opts.onOpen?.();\n this.dispatchEvent(new Event(\"open\"));\n\n await this.#readBody(response.body);\n }\n\n async #readBody(body: ReadableStream): Promise {\n const reader = body.getReader();\n const decoder = new TextDecoder();\n let buffer = \"\";\n const parser = new SseParser((message) => {\n if (message.id !== undefined) {\n this.lastEventId = message.id;\n }\n this.#opts.onMessage(message);\n this.dispatchEvent(new MessageEvent(\"message\", { data: message.data }));\n });\n\n try {\n while (!this.#abort.signal.aborted) {\n const { done, value } = await reader.read();\n if (done) {\n break;\n }\n buffer += decoder.decode(value, { stream: true });\n const lines = buffer.split(/\\r\\n|\\r|\\n/);\n buffer = lines.pop() ?? \"\";\n for (const line of lines) {\n parser.line(line);\n }\n }\n buffer += decoder.decode();\n if (buffer.length > 0) {\n parser.line(buffer);\n }\n parser.end();\n } finally {\n reader.releaseLock();\n }\n }\n\n #resolveConnectionWaiters(): void {\n const waiters = this.#connectionsWaiters.splice(0);\n for (const resolve of waiters) {\n resolve();\n }\n }\n}\n\nclass SseParser {\n #eventType: string | undefined;\n #eventId: string | undefined;\n #data: string[] = [];\n readonly #emit: (message: SseReaderMessage) => void;\n\n constructor(emit: (message: SseReaderMessage) => void) {\n this.#emit = emit;\n }\n\n line(line: string): void {\n if (line === \"\") {\n this.#dispatch();\n return;\n }\n if (line.startsWith(\":\")) {\n return;\n }\n\n const separator = line.indexOf(\":\");\n const field = separator === -1 ? line : line.slice(0, separator);\n const value =\n separator === -1 ? \"\" : line.slice(separator + (line[separator + 1] === \" \" ? 2 : 1));\n\n switch (field) {\n case \"event\":\n this.#eventType = value;\n break;\n case \"data\":\n this.#data.push(value);\n break;\n case \"id\":\n this.#eventId = value;\n break;\n }\n }\n\n end(): void {\n this.#dispatch();\n }\n\n #dispatch(): void {\n if (this.#data.length === 0) {\n this.#eventType = undefined;\n return;\n }\n\n const message: SseReaderMessage = {\n data: this.#data.join(\"\\n\"),\n };\n if (this.#eventId !== undefined) {\n message.id = this.#eventId;\n }\n if (this.#eventType !== undefined) {\n message.type = this.#eventType;\n }\n this.#emit(message);\n this.#data = [];\n this.#eventType = undefined;\n }\n}\n\nfunction backoff(attempt: number, opts: SseReaderOptions): number {\n const base = opts.backoffBaseMs ?? 1000;\n const max = opts.backoffMaxMs ?? 30_000;\n const jitter = opts.jitter ?? 0.3;\n const capped = Math.min(max, base * 2 ** Math.max(0, attempt - 1));\n if (jitter <= 0) {\n return capped;\n }\n return capped + Math.floor(capped * jitter * Math.random());\n}\n\nfunction delay(ms: number, signal: AbortSignal): Promise {\n if (signal.aborted) {\n return Promise.resolve();\n }\n return new Promise((resolve) => {\n let settled = false;\n let timer: ReturnType;\n const finish = () => {\n if (settled) return;\n settled = true;\n clearTimeout(timer);\n signal.removeEventListener(\"abort\", finish);\n globalThis.removeEventListener?.(\"online\", finish);\n resolve();\n };\n timer = setTimeout(finish, ms);\n signal.addEventListener(\"abort\", finish, { once: true });\n globalThis.addEventListener?.(\"online\", finish, { once: true });\n });\n}\n\nfunction asError(error: unknown): Error {\n return error instanceof Error ? error : new Error(String(error));\n}\n","import type {\n ChannelAuthorizeInput,\n ChannelAuthorizeResponse,\n ChannelConnectOptions,\n ChannelDefinitionTransport,\n ChannelMessage,\n ChannelPublishInput,\n ChannelPublishOptions,\n ChannelSocket,\n ChannelSubscribeOptions,\n ChannelSubscription,\n} from \"./types\";\nimport { isChannelDefinition, type ChannelDefinition } from \"./channels/meta\";\nimport { getChannelsConfig } from \"./channels/configure\";\nimport { SseReader } from \"./channels/sse-reader\";\n\nexport type ChannelSocketPublisher = (\n channel: string,\n message: ChannelPublishInput,\n) => Promise>;\n\nlet socketPublisher: ChannelSocketPublisher | null = null;\n\nexport function setChannelSocketPublisher(fn: ChannelSocketPublisher | null): void {\n socketPublisher = fn;\n}\n\nexport const TAKO_CHANNELS_BASE_PATH = \"/_tako/channels\";\nconst DEFAULT_CHANNEL_REPLAY_WINDOW_MS = 24 * 60 * 60 * 1000;\nconst DEFAULT_CHANNEL_INACTIVITY_TTL_MS = 0;\nconst DEFAULT_CHANNEL_KEEPALIVE_INTERVAL_MS = 25 * 1000;\nconst DEFAULT_CHANNEL_MAX_CONNECTION_LIFETIME_MS = 2 * 60 * 60 * 1000;\n\nfunction normalizeBaseUrl(baseUrl?: string): URL {\n if (baseUrl) {\n return new URL(baseUrl);\n }\n if (typeof globalThis.location?.origin === \"string\" && globalThis.location.origin.length > 0) {\n return new URL(globalThis.location.origin);\n }\n throw new Error(\"Channel operations require a baseUrl outside the browser.\");\n}\n\nfunction channelBaseUrl(\n channel: string,\n baseUrl?: string,\n params: Record = {},\n): URL {\n const url = normalizeBaseUrl(baseUrl);\n url.pathname = `${TAKO_CHANNELS_BASE_PATH}/${encodeURIComponent(channel)}`;\n url.search = \"\";\n for (const [key, value] of Object.entries(params)) {\n if (value === undefined || value === null) continue;\n url.searchParams.set(key, encodeQueryValue(value));\n }\n return url;\n}\n\nfunction encodeQueryValue(value: unknown): string {\n if (typeof value === \"string\") return value;\n if (typeof value === \"number\" || typeof value === \"boolean\" || typeof value === \"bigint\") {\n return value.toString();\n }\n return JSON.stringify(value);\n}\n\nfunction withQuery(url: URL, key: string, value?: string | number): URL {\n if (value !== undefined) {\n url.searchParams.set(key, String(value));\n }\n return url;\n}\n\nfunction toWebSocketUrl(url: URL): string {\n const ws = new URL(url.toString());\n ws.protocol = ws.protocol === \"https:\" ? \"wss:\" : \"ws:\";\n return ws.toString();\n}\n\nfunction defaultWebSocketFactory(url: string): unknown {\n const ctor = getChannelsConfig().websocket;\n if (!ctor) {\n throw new Error(\"WebSocket is not available in this runtime.\");\n }\n return new ctor(url);\n}\n\nfunction closeRaw(raw: unknown, code?: number, reason?: string): void {\n if (typeof raw !== \"object\" || raw === null) {\n return;\n }\n const maybeClose = (raw as { close?: (code?: number, reason?: string) => void }).close;\n if (typeof maybeClose === \"function\") {\n maybeClose.call(raw, code, reason);\n }\n}\n\nfunction sendRaw(raw: unknown, data: unknown): void {\n if (typeof raw !== \"object\" || raw === null) {\n throw new Error(\"Channel connection does not support send().\");\n }\n const maybeSend = (raw as { send?: (data: unknown) => void }).send;\n if (typeof maybeSend !== \"function\") {\n throw new Error(\"Channel connection does not support send().\");\n }\n let payload = data;\n if (\n data !== null &&\n typeof data === \"object\" &&\n !(data instanceof ArrayBuffer) &&\n !ArrayBuffer.isView(data) &&\n !(typeof Blob !== \"undefined\" && data instanceof Blob)\n ) {\n payload = JSON.stringify(data);\n }\n maybeSend.call(raw, payload);\n}\n\nfunction sendWhenOpen(raw: unknown, data: unknown): void {\n if (typeof raw !== \"object\" || raw === null) return;\n const target = raw as {\n readyState?: number;\n OPEN?: number;\n addEventListener?: (type: \"open\", listener: () => void, opts?: { once?: boolean }) => void;\n };\n const send = () => sendRaw(raw, data);\n const openState = target.OPEN ?? 1;\n\n if (target.readyState === undefined || target.readyState === openState) {\n send();\n return;\n }\n\n if (typeof target.addEventListener === \"function\") {\n target.addEventListener(\"open\", send, { once: true });\n }\n}\n\nfunction sendAuthEnvelope(raw: unknown, lastMessageId?: string): void {\n void getChannelsConfig()\n .resolveOptionalToken()\n .then((token) => {\n if (!token) return;\n sendWhenOpen(raw, {\n type: \"tako.auth\",\n token,\n ...(lastMessageId !== undefined && { lastMessageId }),\n });\n });\n}\n\nexport class Channel {\n readonly name: string;\n readonly transport: ChannelDefinitionTransport | undefined;\n readonly params: Record;\n\n constructor(\n name: string,\n transport?: ChannelDefinitionTransport,\n params: Record = {},\n ) {\n this.name = name;\n this.transport = transport;\n this.params = params;\n }\n\n async publish(\n message: ChannelPublishInput,\n options: ChannelPublishOptions = {},\n ): Promise> {\n if (socketPublisher && !options.baseUrl) {\n return socketPublisher(this.name, message);\n }\n\n throw new Error(\n \"Channel.publish requires the Tako server runtime. Browser clients should use connect().send() for WebSocket channels.\",\n );\n }\n\n subscribe(options: ChannelSubscribeOptions = {}): ChannelSubscription {\n const url = channelBaseUrl(this.name, options.baseUrl, this.params);\n const factory = options.eventSourceFactory;\n const init: { headers?: Record; lastEventId?: string } = {};\n if (options.headers !== undefined) {\n init.headers = options.headers;\n }\n if (options.lastEventId !== undefined) {\n init.lastEventId = options.lastEventId;\n }\n if (factory) {\n const raw = factory(url.toString(), init);\n return {\n transport: \"sse\",\n raw,\n close() {\n closeRaw(raw);\n },\n };\n }\n\n const readerOptions = {\n fetch: getChannelsConfig().fetch,\n onMessage: () => {},\n retryOnDisconnect: true,\n ...(options.headers !== undefined && { headers: options.headers }),\n };\n const reader = new SseReader(url.toString(), readerOptions);\n if (options.lastEventId !== undefined) {\n reader.lastEventId = options.lastEventId;\n }\n void reader.start();\n return {\n transport: \"sse\",\n raw: reader,\n close() {\n reader.close();\n },\n };\n }\n\n connect(options: ChannelConnectOptions = {}): ChannelSocket {\n if (this.transport !== \"ws\") {\n throw new Error(\"Channel does not enable WebSocket transport.\");\n }\n\n const url = channelBaseUrl(this.name, options.baseUrl, this.params);\n withQuery(url, \"last_message_id\", options.lastMessageId);\n\n const factory = options.webSocketFactory ?? defaultWebSocketFactory;\n const raw = factory(toWebSocketUrl(url));\n sendAuthEnvelope(raw, options.lastMessageId);\n return {\n transport: \"ws\",\n raw,\n close(code?: number, reason?: string) {\n closeRaw(raw, code, reason);\n },\n send(data: unknown) {\n sendRaw(raw, data);\n },\n };\n }\n}\n\ninterface RegistryEntry {\n name: string;\n definition: ChannelDefinition;\n}\n\n/**\n * Handle returned by the default export of a `/channels/.ts` file\n * (unparameterized) or by invoking a parameterized channel with its params.\n */\nexport interface ChannelHandle {\n publish: Channel[\"publish\"];\n subscribe: Channel[\"subscribe\"];\n connect?: Channel[\"connect\"];\n}\n\n/**\n * Loose runtime shape for the default export of a channel module.\n * Unparameterized channels expose `publish/subscribe/connect` directly;\n * parameterized channels are callable `(params)` returning a handle. Typed\n * as an intersection so both usages compile — runtime enforces which one\n * is valid for a given channel.\n */\nexport type ChannelAccessorEntry = ChannelHandle &\n ((params: Record) => ChannelHandle);\n\nfunction makeHandle(\n definition: ChannelDefinition,\n resolvedName: string,\n params: Record = {},\n): ChannelHandle {\n const isWs = definition.transport === \"ws\";\n const channel = new Channel(resolvedName, isWs ? \"ws\" : undefined, params);\n const handle: ChannelHandle = {\n publish: channel.publish.bind(channel),\n subscribe: channel.subscribe.bind(channel),\n };\n if (isWs) {\n handle.connect = channel.connect.bind(channel);\n }\n return handle;\n}\n\nfunction buildAccessorEntry(definition: ChannelDefinition, baseName: string): ChannelAccessorEntry {\n if (!definition.hasParams) {\n return makeHandle(definition, baseName) as ChannelAccessorEntry;\n }\n return ((params: Record) =>\n makeHandle(definition, baseName, params)) as ChannelAccessorEntry;\n}\n\n/** Convert a camelCase prop to the kebab-case channel file name. */\nfunction propToChannelName(prop: string): string {\n return prop\n .replace(/([a-z])([A-Z])/g, \"$1-$2\")\n .replace(/([a-zA-Z])([0-9])/g, \"$1-$2\")\n .replace(/([0-9])([a-zA-Z])/g, \"$1-$2\")\n .toLowerCase();\n}\n\nexport class ChannelRegistry {\n private entries: RegistryEntry[] = [];\n\n get all(): ReadonlyArray {\n return this.entries;\n }\n\n register(\n name: string,\n input: ChannelDefinition | { readonly definition: ChannelDefinition },\n ): void {\n const definition: ChannelDefinition =\n \"definition\" in input && isChannelDefinition(input.definition)\n ? input.definition\n : (input as ChannelDefinition);\n if (this.entries.some((e) => e.name === name)) {\n throw new Error(`duplicate channel '${name}'`);\n }\n if (definition.channel !== name) {\n throw new Error(\n `channel '${name}' registration received definition for '${definition.channel}'`,\n );\n }\n this.entries.push({ name, definition });\n }\n\n clear(): void {\n this.entries = [];\n }\n\n /** Look up a discovered channel by its declared channel name. */\n findByName(name: string): RegistryEntry | undefined {\n return this.entries.find((e) => e.name === name);\n }\n\n resolve(\n channel: string,\n ): { definition: ChannelDefinition; params: Record } | null {\n const entry = this.entries.find((candidate) => candidate.name === channel);\n if (!entry) return null;\n return { definition: entry.definition, params: {} };\n }\n\n async authorize(input: ChannelAuthorizeInput): Promise {\n const matched = this.resolve(input.channel);\n if (!matched) return { ok: false };\n\n if (input.operation === \"publish\" && matched.definition.handler === undefined) {\n return { ok: false, reason: \"sse_publish_not_allowed\" };\n }\n\n if (matched.definition.auth === false) {\n return { ok: true, ...definitionLifecycleConfig(matched.definition) };\n }\n\n const verdict = await matched.definition.auth.verify({\n channel: input.channel,\n operation: input.operation,\n params: input.params,\n ...(input.header !== undefined && { header: input.header }),\n ...(input.cookie !== undefined && { cookie: input.cookie }),\n });\n\n if (verdict === false) return { ok: false };\n\n const config = definitionLifecycleConfig(matched.definition);\n if (verdict === true) return { ok: true, ...config };\n return verdict.subject === undefined\n ? { ok: true, ...config }\n : { ok: true, ...config, subject: verdict.subject };\n }\n}\n\n/**\n * Wrap a {@link ChannelRegistry} in a Proxy so property access via\n * `accessor.` returns a {@link ChannelAccessorEntry} for the matching\n * discovered channel (the prop is kebab-cased first). Existing registry\n * methods (`register`, `resolve`, `authorize`, `clear`, `all`, `findByName`)\n * pass through.\n */\nexport function withChannelAccessor(\n registry: ChannelRegistry,\n): ChannelRegistry & Record {\n const handler: ProxyHandler = {\n get(target, prop, receiver) {\n if (typeof prop === \"string\" && !(prop in target)) {\n const entry = target.findByName(propToChannelName(prop));\n if (entry) {\n return buildAccessorEntry(entry.definition, entry.name);\n }\n }\n return Reflect.get(target, prop, receiver);\n },\n };\n return new Proxy(registry, handler) as ChannelRegistry & Record;\n}\n\nfunction definitionLifecycleConfig(definition: ChannelDefinition) {\n const config: Omit = {\n replayWindowMs: definition.replayWindowMs ?? DEFAULT_CHANNEL_REPLAY_WINDOW_MS,\n inactivityTtlMs: definition.inactivityTtlMs ?? DEFAULT_CHANNEL_INACTIVITY_TTL_MS,\n keepaliveIntervalMs: definition.keepaliveIntervalMs ?? DEFAULT_CHANNEL_KEEPALIVE_INTERVAL_MS,\n maxConnectionLifetimeMs:\n definition.maxConnectionLifetimeMs ?? DEFAULT_CHANNEL_MAX_CONNECTION_LIFETIME_MS,\n };\n if (definition.handler !== undefined) {\n config.transport = \"ws\";\n }\n return config;\n}\n","/**\n * Stable error codes raised by the Tako internal-RPC layer. Apps can switch\n * on `err.code` to render a user-safe message; the original cause is on\n * `err.cause` (and logged to stdout so operators can debug).\n */\nexport type TakoErrorCode =\n | \"TAKO_UNAVAILABLE\"\n | \"TAKO_TIMEOUT\"\n | \"TAKO_PROTOCOL\"\n | \"TAKO_RPC_ERROR\";\n\n/**\n * Error raised by Tako SDK operations that cross the internal socket\n * (workflows enqueue/signal/claim/..., channels publish). Every raw Node\n * socket failure is wrapped so internal paths and syscall names never leak\n * to end users — `message` stays generic, `code` is stable, and the\n * original error is preserved on `.cause`.\n */\nexport class TakoError extends Error {\n readonly code: TakoErrorCode;\n\n constructor(code: TakoErrorCode, message: string, options?: { cause?: unknown }) {\n super(message, options);\n this.name = \"TakoError\";\n this.code = code;\n }\n}\n","import { TakoError } from \"../tako/error\";\nimport type { EnqueueOptions } from \"./engine\";\nimport type { RunId, WorkflowOpts, WorkflowRuntimeOpts } from \"./types\";\nimport type { WorkflowHandler } from \"./worker\";\n\nexport const WORKFLOW_SYMBOL = Symbol(\"workflow\");\n\nexport interface WorkflowDefinition

{\n readonly type: typeof WORKFLOW_SYMBOL;\n readonly name: string;\n readonly handler: WorkflowHandler

;\n readonly opts: WorkflowRuntimeOpts;\n}\n\n/**\n * The default export from a `/workflows/.ts` file. `.enqueue(payload)`\n * schedules a run; `.definition` holds the discovery metadata.\n */\nexport interface WorkflowExport

{\n readonly definition: WorkflowDefinition

;\n /** Schedule a run of this workflow with the declared payload type. */\n enqueue(payload: P, options?: EnqueueOptions): Promise;\n}\n\n/**\n * Runtime hooks for workflow enqueue and signal. The server/worker\n * bootstrap installs these at boot; client bundles never install them,\n * so `.enqueue()` and `signal()` throw a clean `TakoError` if reached\n * from browser code (same failure shape as a missing Tako server).\n */\nexport interface WorkflowRuntime {\n enqueue(name: string, payload: unknown, options?: EnqueueOptions): Promise;\n signal(event: string, payload?: unknown): Promise;\n}\n\nlet runtime: WorkflowRuntime | null = null;\n\n/**\n * Install the workflow runtime. Called once at server/worker boot — keeps\n * `defineWorkflow`, `.enqueue`, and `signal` free of any static import\n * chain into the RPC client (and its `node:net` dep), so authoring files\n * stay safe to bundle into isomorphic code.\n */\nexport function setWorkflowRuntime(rt: WorkflowRuntime | null): void {\n runtime = rt;\n}\n\nfunction requireRuntime(): WorkflowRuntime {\n if (!runtime) {\n throw new TakoError(\n \"TAKO_UNAVAILABLE\",\n \"Workflow runtime not installed. `.enqueue()` and `signal()` can only be called from server-side code.\",\n );\n }\n return runtime;\n}\n\n/**\n * Define a workflow and return a typed handle ready to enqueue.\n *\n * The `name` must be unique per app — the conventional choice is the file\n * basename (kebab-case), matching the filename discovery scans for.\n *\n * @example\n * ```ts\n * // /workflows/send-email.ts\n * import { defineWorkflow } from \"tako.sh\";\n *\n * export default defineWorkflow<{ userId: string }>(\n * \"send-email\",\n * {\n * retries: 4,\n * schedule: \"0 9 * * *\",\n * handler: async (payload, ctx) => {\n * ctx.logger.info(\"sending email\");\n * await ctx.run(\"send\", (step) => {\n * step.logger.info(\"calling mailer\");\n * return sendEmail(payload.userId);\n * });\n * },\n * },\n * );\n *\n * // anywhere:\n * import sendEmail from \"./workflows/send-email\";\n * await sendEmail.enqueue({ userId: \"u1\" });\n * ```\n */\nexport function defineWorkflow

(\n name: string,\n opts: WorkflowOpts

,\n): WorkflowExport

{\n const { handler, ...runtimeOpts } = opts;\n const definition: WorkflowDefinition

= {\n type: WORKFLOW_SYMBOL,\n name,\n handler,\n opts: runtimeOpts,\n };\n return {\n definition,\n enqueue(payload, options) {\n return requireRuntime().enqueue(name, payload, options);\n },\n };\n}\n\n/**\n * Wake every workflow run parked on `ctx.waitFor(event)` with a payload.\n * Call from any server-side context — an HTTP handler, a webhook receiver,\n * a cron tick, another workflow. Returns the number of waiters woken.\n *\n * @example\n * ```ts\n * import { signal } from \"tako.sh\";\n * await signal(`approval:order-${orderId}`, { approved: true });\n * ```\n */\nexport function signal(event: string, payload?: unknown): Promise {\n return requireRuntime().signal(event, payload);\n}\n\n/** Narrow `value` to a `WorkflowExport` produced by `defineWorkflow`. */\nexport function isWorkflowExport(value: unknown): value is WorkflowExport {\n return (\n typeof value === \"object\" &&\n value !== null &&\n \"definition\" in value &&\n isWorkflowDefinition((value as { definition: unknown }).definition)\n );\n}\n\nexport function isWorkflowDefinition(value: unknown): value is WorkflowDefinition {\n return (\n typeof value === \"object\" &&\n value !== null &&\n \"type\" in value &&\n \"name\" in value &&\n \"handler\" in value &&\n \"opts\" in value &&\n (value as { type: unknown }).type === WORKFLOW_SYMBOL\n 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