@ai-sdk/rsc/dist/rsc-server.mjs.map

[React Server Components](https://react.dev/reference/rsc/server-components) for the [AI SDK](https://ai-sdk.dev/docs):

{"version":3,"sources":["../src/ai-state.tsx","../src/util/create-resolvable-promise.ts","../src/util/is-function.ts","../src/provider.tsx","../src/stream-ui/stream-ui.tsx","../src/util/is-async-generator.ts","../src/util/is-generator.ts","../src/util/constants.ts","../src/streamable-ui/create-suspended-chunk.tsx","../src/streamable-ui/create-streamable-ui.tsx","../src/streamable-value/streamable-value.ts","../src/streamable-value/create-streamable-value.ts"],"sourcesContent":["import * as jsondiffpatch from 'jsondiffpatch';\nimport { AsyncLocalStorage } from 'node:async_hooks';\nimport { createResolvablePromise } from './util/create-resolvable-promise';\nimport { isFunction } from './util/is-function';\nimport type {\n  AIProvider,\n  InferAIState,\n  InternalAIStateStorageOptions,\n  MutableAIState,\n  ValueOrUpdater,\n} from './types';\n\n// It is possible that multiple AI requests get in concurrently, for different\n// AI instances. So ALS is necessary here for a simpler API.\nconst asyncAIStateStorage = new AsyncLocalStorage<{\n  currentState: any;\n  originalState: any;\n  sealed: boolean;\n  options: InternalAIStateStorageOptions;\n  mutationDeltaPromise?: Promise<any>;\n  mutationDeltaResolve?: (v: any) => void;\n}>();\n\nfunction getAIStateStoreOrThrow(message: string) {\n  const store = asyncAIStateStorage.getStore();\n  if (!store) {\n    throw new Error(message);\n  }\n  return store;\n}\n\nexport function withAIState<S, T>(\n  { state, options }: { state: S; options: InternalAIStateStorageOptions },\n  fn: () => T,\n): T {\n  return asyncAIStateStorage.run(\n    {\n      currentState: JSON.parse(JSON.stringify(state)), // deep clone object\n      originalState: state,\n      sealed: false,\n      options,\n    },\n    fn,\n  );\n}\n\nexport function getAIStateDeltaPromise() {\n  const store = getAIStateStoreOrThrow('Internal error occurred.');\n  return store.mutationDeltaPromise;\n}\n\n// Internal method. This will be called after the AI Action has been returned\n// and you can no longer call `getMutableAIState()` inside any async callbacks\n// created by that Action.\nexport function sealMutableAIState() {\n  const store = getAIStateStoreOrThrow('Internal error occurred.');\n  store.sealed = true;\n}\n\n/**\n * Get the current AI state.\n * If `key` is provided, it will return the value of the specified key in the\n * AI state, if it's an object. If it's not an object, it will throw an error.\n *\n * @example const state = getAIState() // Get the entire AI state\n * @example const field = getAIState('key') // Get the value of the key\n */\nfunction getAIState<AI extends AIProvider = any>(): Readonly<\n  InferAIState<AI, any>\n>;\nfunction getAIState<AI extends AIProvider = any>(\n  key: keyof InferAIState<AI, any>,\n): Readonly<InferAIState<AI, any>[typeof key]>;\nfunction getAIState<AI extends AIProvider = any>(\n  ...args: [] | [key: keyof InferAIState<AI, any>]\n) {\n  const store = getAIStateStoreOrThrow(\n    '`getAIState` must be called within an AI Action.',\n  );\n\n  if (args.length > 0) {\n    const key = args[0];\n    if (typeof store.currentState !== 'object') {\n      throw new Error(\n        `You can't get the \"${String(\n          key,\n        )}\" field from the AI state because it's not an object.`,\n      );\n    }\n    return store.currentState[key as keyof typeof store.currentState];\n  }\n\n  return store.currentState;\n}\n\n/**\n * Get the mutable AI state. Note that you must call `.done()` when finishing\n * updating the AI state.\n *\n * @example\n * ```tsx\n * const state = getMutableAIState()\n * state.update({ ...state.get(), key: 'value' })\n * state.update((currentState) => ({ ...currentState, key: 'value' }))\n * state.done()\n * ```\n *\n * @example\n * ```tsx\n * const state = getMutableAIState()\n * state.done({ ...state.get(), key: 'value' }) // Done with a new state\n * ```\n */\nfunction getMutableAIState<AI extends AIProvider = any>(): MutableAIState<\n  InferAIState<AI, any>\n>;\nfunction getMutableAIState<AI extends AIProvider = any>(\n  key: keyof InferAIState<AI, any>,\n): MutableAIState<InferAIState<AI, any>[typeof key]>;\nfunction getMutableAIState<AI extends AIProvider = any>(\n  ...args: [] | [key: keyof InferAIState<AI, any>]\n) {\n  type AIState = InferAIState<AI, any>;\n  type AIStateWithKey = typeof args extends [key: keyof AIState]\n    ? AIState[(typeof args)[0]]\n    : AIState;\n  type NewStateOrUpdater = ValueOrUpdater<AIStateWithKey>;\n\n  const store = getAIStateStoreOrThrow(\n    '`getMutableAIState` must be called within an AI Action.',\n  );\n\n  if (store.sealed) {\n    throw new Error(\n      \"`getMutableAIState` must be called before returning from an AI Action. Please move it to the top level of the Action's function body.\",\n    );\n  }\n\n  if (!store.mutationDeltaPromise) {\n    const { promise, resolve } = createResolvablePromise();\n    store.mutationDeltaPromise = promise;\n    store.mutationDeltaResolve = resolve;\n  }\n\n  function doUpdate(newState: NewStateOrUpdater, done: boolean) {\n    if (args.length > 0) {\n      if (typeof store.currentState !== 'object') {\n        const key = args[0];\n        throw new Error(\n          `You can't modify the \"${String(\n            key,\n          )}\" field of the AI state because it's not an object.`,\n        );\n      }\n    }\n\n    if (isFunction(newState)) {\n      if (args.length > 0) {\n        store.currentState[args[0]] = newState(store.currentState[args[0]]);\n      } else {\n        store.currentState = newState(store.currentState);\n      }\n    } else {\n      if (args.length > 0) {\n        store.currentState[args[0]] = newState;\n      } else {\n        store.currentState = newState;\n      }\n    }\n\n    store.options.onSetAIState?.({\n      key: args.length > 0 ? args[0] : undefined,\n      state: store.currentState,\n      done,\n    });\n  }\n\n  const mutableState = {\n    get: () => {\n      if (args.length > 0) {\n        const key = args[0];\n        if (typeof store.currentState !== 'object') {\n          throw new Error(\n            `You can't get the \"${String(\n              key,\n            )}\" field from the AI state because it's not an object.`,\n          );\n        }\n        return store.currentState[key] as Readonly<AIStateWithKey>;\n      }\n\n      return store.currentState as Readonly<AIState>;\n    },\n    update: function update(newAIState: NewStateOrUpdater) {\n      doUpdate(newAIState, false);\n    },\n    done: function done(...doneArgs: [] | [NewStateOrUpdater]) {\n      if (doneArgs.length > 0) {\n        doUpdate(doneArgs[0] as NewStateOrUpdater, true);\n      }\n\n      const delta = jsondiffpatch.diff(store.originalState, store.currentState);\n      store.mutationDeltaResolve!(delta);\n    },\n  };\n\n  return mutableState;\n}\n\nexport { getAIState, getMutableAIState };\n","/**\n * Creates a Promise with externally accessible resolve and reject functions.\n *\n * @template T - The type of the value that the Promise will resolve to.\n * @returns An object containing:\n *   - promise: A Promise that can be resolved or rejected externally.\n *   - resolve: A function to resolve the Promise with a value of type T.\n *   - reject: A function to reject the Promise with an error.\n */\nexport function createResolvablePromise<T = any>(): {\n  promise: Promise<T>;\n  resolve: (value: T) => void;\n  reject: (error: unknown) => void;\n} {\n  let resolve: (value: T) => void;\n  let reject: (error: unknown) => void;\n\n  const promise = new Promise<T>((res, rej) => {\n    resolve = res;\n    reject = rej;\n  });\n\n  return {\n    promise,\n    resolve: resolve!,\n    reject: reject!,\n  };\n}\n","/**\n * Checks if the given value is a function.\n *\n * @param {unknown} value - The value to check.\n * @returns {boolean} True if the value is a function, false otherwise.\n */\nexport const isFunction = (value: unknown): value is Function =>\n  typeof value === 'function';\n","// This file provides the AI context to all AI Actions via AsyncLocalStorage.\n\nimport * as React from 'react';\nimport { InternalAIProvider } from './rsc-shared.mjs';\nimport {\n  withAIState,\n  getAIStateDeltaPromise,\n  sealMutableAIState,\n} from './ai-state';\nimport type {\n  ServerWrappedActions,\n  AIAction,\n  AIActions,\n  AIProvider,\n  InternalAIStateStorageOptions,\n  OnSetAIState,\n  OnGetUIState,\n} from './types';\n\nasync function innerAction<T>(\n  {\n    action,\n    options,\n  }: { action: AIAction; options: InternalAIStateStorageOptions },\n  state: T,\n  ...args: unknown[]\n) {\n  'use server';\n  return await withAIState(\n    {\n      state,\n      options,\n    },\n    async () => {\n      const result = await action(...args);\n      sealMutableAIState();\n      return [getAIStateDeltaPromise() as Promise<T>, result];\n    },\n  );\n}\n\nfunction wrapAction<T = unknown>(\n  action: AIAction,\n  options: InternalAIStateStorageOptions,\n) {\n  return innerAction.bind(null, { action, options }) as AIAction<T>;\n}\n\nexport function createAI<\n  AIState = any,\n  UIState = any,\n  Actions extends AIActions = {},\n>({\n  actions,\n  initialAIState,\n  initialUIState,\n\n  onSetAIState,\n  onGetUIState,\n}: {\n  actions: Actions;\n  initialAIState?: AIState;\n  initialUIState?: UIState;\n\n  /**\n   * This function is called whenever the AI state is updated by an Action.\n   * You can use this to persist the AI state to a database, or to send it to a\n   * logging service.\n   */\n  onSetAIState?: OnSetAIState<AIState>;\n\n  /**\n   * This function is used to retrieve the UI state based on the AI state.\n   * For example, to render the initial UI state based on a given AI state, or\n   * to sync the UI state when the application is already loaded.\n   *\n   * If returning `undefined`, the client side UI state will not be updated.\n   *\n   * This function must be annotated with the `\"use server\"` directive.\n   *\n   * @example\n   * ```tsx\n   * onGetUIState: async () => {\n   *   'use server';\n   *\n   *   const currentAIState = getAIState();\n   *   const externalAIState = await loadAIStateFromDatabase();\n   *\n   *   if (currentAIState === externalAIState) return undefined;\n   *\n   *   // Update current AI state and return the new UI state\n   *   const state = getMutableAIState()\n   *   state.done(externalAIState)\n   *\n   *   return <div>...</div>;\n   * }\n   * ```\n   */\n  onGetUIState?: OnGetUIState<UIState>;\n}) {\n  // Wrap all actions with our HoC.\n  const wrappedActions: ServerWrappedActions = {};\n  for (const name in actions) {\n    wrappedActions[name] = wrapAction(actions[name], {\n      onSetAIState,\n    });\n  }\n\n  const wrappedSyncUIState = onGetUIState\n    ? wrapAction(onGetUIState, {})\n    : undefined;\n\n  const AI: AIProvider<AIState, UIState, Actions> = async props => {\n    if ('useState' in React) {\n      // This file must be running on the React Server layer.\n      // Ideally we should be using `import \"server-only\"` here but we can have a\n      // more customized error message with this implementation.\n      throw new Error(\n        'This component can only be used inside Server Components.',\n      );\n    }\n\n    let uiState = props.initialUIState ?? initialUIState;\n    let aiState = props.initialAIState ?? initialAIState;\n    let aiStateDelta = undefined;\n\n    if (wrappedSyncUIState) {\n      const [newAIStateDelta, newUIState] = await wrappedSyncUIState(aiState);\n      if (newUIState !== undefined) {\n        aiStateDelta = newAIStateDelta;\n        uiState = newUIState;\n      }\n    }\n\n    return (\n      <InternalAIProvider\n        wrappedActions={wrappedActions}\n        wrappedSyncUIState={wrappedSyncUIState}\n        initialUIState={uiState}\n        initialAIState={aiState}\n        initialAIStatePatch={aiStateDelta}\n      >\n        {props.children}\n      </InternalAIProvider>\n    );\n  };\n\n  return AI;\n}\n","import { LanguageModelV2, LanguageModelV2CallWarning } from '@ai-sdk/provider';\nimport {\n  InferSchema,\n  ProviderOptions,\n  safeParseJSON,\n} from '@ai-sdk/provider-utils';\nimport { ReactNode } from 'react';\nimport * as z3 from 'zod/v3';\nimport * as z4 from 'zod/v4';\nimport {\n  CallWarning,\n  FinishReason,\n  LanguageModelUsage,\n  ToolChoice,\n  Prompt,\n  CallSettings,\n  InvalidToolInputError,\n  NoSuchToolError,\n  Schema,\n} from 'ai';\nimport {\n  standardizePrompt,\n  prepareToolsAndToolChoice,\n  prepareRetries,\n  prepareCallSettings,\n  convertToLanguageModelPrompt,\n} from 'ai/internal';\nimport { createResolvablePromise } from '../util/create-resolvable-promise';\nimport { isAsyncGenerator } from '../util/is-async-generator';\nimport { isGenerator } from '../util/is-generator';\nimport { createStreamableUI } from '../streamable-ui/create-streamable-ui';\n\ntype Streamable = ReactNode | Promise<ReactNode>;\n\ntype Renderer<T extends Array<any>> = (\n  ...args: T\n) =>\n  | Streamable\n  | Generator<Streamable, Streamable, void>\n  | AsyncGenerator<Streamable, Streamable, void>;\n\ntype RenderTool<\n  INPUT_SCHEMA extends z4.core.$ZodType | z3.Schema | Schema = any,\n> = {\n  description?: string;\n  inputSchema: INPUT_SCHEMA;\n  generate?: Renderer<\n    [\n      InferSchema<INPUT_SCHEMA>,\n      {\n        toolName: string;\n        toolCallId: string;\n      },\n    ]\n  >;\n};\n\ntype RenderText = Renderer<\n  [\n    {\n      /**\n       * The full text content from the model so far.\n       */\n      content: string;\n\n      /**\n       * The new appended text content from the model since the last `text` call.\n       */\n      delta: string;\n\n      /**\n       * Whether the model is done generating text.\n       * If `true`, the `content` will be the final output and this call will be the last.\n       */\n      done: boolean;\n    },\n  ]\n>;\n\ntype RenderResult = {\n  value: ReactNode;\n} & Awaited<ReturnType<LanguageModelV2['doStream']>>;\n\nconst defaultTextRenderer: RenderText = ({ content }: { content: string }) =>\n  content;\n\n/**\n * `streamUI` is a helper function to create a streamable UI from LLMs.\n */\nexport async function streamUI<\n  TOOLS extends { [name: string]: z4.core.$ZodType | z3.Schema | Schema } = {},\n>({\n  model,\n  tools,\n  toolChoice,\n  system,\n  prompt,\n  messages,\n  maxRetries,\n  abortSignal,\n  headers,\n  initial,\n  text,\n  providerOptions,\n  onFinish,\n  ...settings\n}: CallSettings &\n  Prompt & {\n    /**\n     * The language model to use.\n     */\n    model: LanguageModelV2;\n\n    /**\n     * The tools that the model can call. The model needs to support calling tools.\n     */\n    tools?: {\n      [name in keyof TOOLS]: RenderTool<TOOLS[name]>;\n    };\n\n    /**\n     * The tool choice strategy. Default: 'auto'.\n     */\n    toolChoice?: ToolChoice<TOOLS>;\n\n    text?: RenderText;\n    initial?: ReactNode;\n\n    /**\nAdditional provider-specific options. They are passed through\nto the provider from the AI SDK and enable provider-specific\nfunctionality that can be fully encapsulated in the provider.\n */\n    providerOptions?: ProviderOptions;\n\n    /**\n     * Callback that is called when the LLM response and the final object validation are finished.\n     */\n    onFinish?: (event: {\n      /**\n       * The reason why the generation finished.\n       */\n      finishReason: FinishReason;\n      /**\n       * The token usage of the generated response.\n       */\n      usage: LanguageModelUsage;\n      /**\n       * The final ui node that was generated.\n       */\n      value: ReactNode;\n      /**\n       * Warnings from the model provider (e.g. unsupported settings)\n       */\n      warnings?: CallWarning[];\n      /**\n       * Optional response data.\n       */\n      response?: {\n        /**\n         * Response headers.\n         */\n        headers?: Record<string, string>;\n      };\n    }) => Promise<void> | void;\n  }): Promise<RenderResult> {\n  // TODO: Remove these errors after the experimental phase.\n  if (typeof model === 'string') {\n    throw new Error(\n      '`model` cannot be a string in `streamUI`. Use the actual model instance instead.',\n    );\n  }\n  if ('functions' in settings) {\n    throw new Error(\n      '`functions` is not supported in `streamUI`, use `tools` instead.',\n    );\n  }\n  if ('provider' in settings) {\n    throw new Error(\n      '`provider` is no longer needed in `streamUI`. Use `model` instead.',\n    );\n  }\n  if (tools) {\n    for (const [name, tool] of Object.entries(tools)) {\n      if ('render' in tool) {\n        throw new Error(\n          'Tool definition in `streamUI` should not have `render` property. Use `generate` instead. Found in tool: ' +\n            name,\n        );\n      }\n    }\n  }\n\n  const ui = createStreamableUI(initial);\n\n  // The default text renderer just returns the content as string.\n  const textRender = text || defaultTextRenderer;\n\n  let finished: Promise<void> | undefined;\n\n  let finishEvent: {\n    finishReason: FinishReason;\n    usage: LanguageModelUsage;\n    warnings?: CallWarning[];\n    response?: {\n      headers?: Record<string, string>;\n    };\n  } | null = null;\n\n  async function render({\n    args,\n    renderer,\n    streamableUI,\n    isLastCall = false,\n  }: {\n    renderer: undefined | Renderer<any>;\n    args: [payload: any] | [payload: any, options: any];\n    streamableUI: ReturnType<typeof createStreamableUI>;\n    isLastCall?: boolean;\n  }) {\n    if (!renderer) return;\n\n    // create a promise that will be resolved when the render call is finished.\n    // it is appended to the `finished` promise chain to ensure the render call\n    // is finished before the next render call starts.\n    const renderFinished = createResolvablePromise<void>();\n    finished = finished\n      ? finished.then(() => renderFinished.promise)\n      : renderFinished.promise;\n\n    const rendererResult = renderer(...args);\n\n    if (isAsyncGenerator(rendererResult) || isGenerator(rendererResult)) {\n      while (true) {\n        const { done, value } = await rendererResult.next();\n        const node = await value;\n\n        if (isLastCall && done) {\n          streamableUI.done(node);\n        } else {\n          streamableUI.update(node);\n        }\n\n        if (done) break;\n      }\n    } else {\n      const node = await rendererResult;\n\n      if (isLastCall) {\n        streamableUI.done(node);\n      } else {\n        streamableUI.update(node);\n      }\n    }\n\n    // resolve the promise to signal that the render call is finished\n    renderFinished.resolve(undefined);\n  }\n\n  const { retry } = prepareRetries({ maxRetries, abortSignal });\n\n  const validatedPrompt = await standardizePrompt({\n    system,\n    prompt,\n    messages,\n  } as Prompt);\n  const result = await retry(async () =>\n    model.doStream({\n      ...prepareCallSettings(settings),\n      ...prepareToolsAndToolChoice({\n        tools: tools as any,\n        toolChoice,\n        activeTools: undefined,\n      }),\n      prompt: await convertToLanguageModelPrompt({\n        prompt: validatedPrompt,\n        supportedUrls: await model.supportedUrls,\n        download: undefined,\n      }),\n      providerOptions,\n      abortSignal,\n      headers,\n      includeRawChunks: false,\n    }),\n  );\n\n  // For the stream and consume it asynchronously:\n  const [stream, forkedStream] = result.stream.tee();\n  (async () => {\n    try {\n      let content = '';\n      let hasToolCall = false;\n      let warnings: LanguageModelV2CallWarning[] | undefined;\n\n      const reader = forkedStream.getReader();\n      while (true) {\n        const { done, value } = await reader.read();\n        if (done) break;\n\n        switch (value.type) {\n          case 'stream-start': {\n            warnings = value.warnings;\n            break;\n          }\n\n          case 'text-delta': {\n            content += value.delta;\n            render({\n              renderer: textRender,\n              args: [{ content, done: false, delta: value.delta }],\n              streamableUI: ui,\n            });\n            break;\n          }\n\n          case 'tool-input-start':\n          case 'tool-input-delta': {\n            hasToolCall = true;\n            break;\n          }\n\n          case 'tool-call': {\n            const toolName = value.toolName as keyof TOOLS & string;\n\n            if (!tools) {\n              throw new NoSuchToolError({ toolName });\n            }\n\n            const tool = tools[toolName];\n            if (!tool) {\n              throw new NoSuchToolError({\n                toolName,\n                availableTools: Object.keys(tools),\n              });\n            }\n\n            hasToolCall = true;\n            const parseResult = await safeParseJSON({\n              text: value.input,\n              schema: tool.inputSchema,\n            });\n\n            if (parseResult.success === false) {\n              throw new InvalidToolInputError({\n                toolName,\n                toolInput: value.input,\n                cause: parseResult.error,\n              });\n            }\n\n            render({\n              renderer: tool.generate,\n              args: [\n                parseResult.value,\n                {\n                  toolName,\n                  toolCallId: value.toolCallId,\n                },\n              ],\n              streamableUI: ui,\n              isLastCall: true,\n            });\n\n            break;\n          }\n\n          case 'error': {\n            throw value.error;\n          }\n\n          case 'finish': {\n            finishEvent = {\n              finishReason: value.finishReason,\n              usage: value.usage,\n              warnings,\n              response: result.response,\n            };\n            break;\n          }\n        }\n      }\n\n      if (!hasToolCall) {\n        render({\n          renderer: textRender,\n          args: [{ content, done: true }],\n          streamableUI: ui,\n          isLastCall: true,\n        });\n      }\n\n      await finished;\n\n      if (finishEvent && onFinish) {\n        await onFinish({\n          ...finishEvent,\n          value: ui.value,\n        });\n      }\n    } catch (error) {\n      // During the stream rendering, we don't want to throw the error to the\n      // parent scope but only let the React's error boundary to catch it.\n      ui.error(error);\n    }\n  })();\n\n  return {\n    ...result,\n    stream,\n    value: ui.value,\n  };\n}\n","export function isAsyncGenerator<T, TReturn, TNext>(\n  value: unknown,\n): value is AsyncGenerator<T, TReturn, TNext> {\n  return (\n    value != null && typeof value === 'object' && Symbol.asyncIterator in value\n  );\n}\n","export function isGenerator<T, TReturn, TNext>(\n  value: unknown,\n): value is Generator<T, TReturn, TNext> {\n  return value != null && typeof value === 'object' && Symbol.iterator in value;\n}\n","/**\n * Warning time for notifying developers that a stream is hanging in dev mode\n * using a console.warn.\n */\nexport const HANGING_STREAM_WARNING_TIME_MS = 15 * 1000;\n","import React, { Suspense } from 'react';\nimport { createResolvablePromise } from '../util/create-resolvable-promise';\n\n// Recursive type for the chunk.\ntype ChunkType =\n  | {\n      done: false;\n      value: React.ReactNode;\n      next: Promise<ChunkType>;\n      append?: boolean;\n    }\n  | {\n      done: true;\n      value: React.ReactNode;\n    };\n\n// Use single letter names for the variables to reduce the size of the RSC payload.\n// `R` for `Row`, `c` for `current`, `n` for `next`.\n// Note: Array construction is needed to access the name R.\nconst R = [\n  (async ({\n    c: current,\n    n: next,\n  }: {\n    c: React.ReactNode;\n    n: Promise<ChunkType>;\n  }) => {\n    const chunk = await next;\n\n    if (chunk.done) {\n      return chunk.value;\n    }\n\n    if (chunk.append) {\n      return (\n        <>\n          {current}\n          <Suspense fallback={chunk.value}>\n            <R c={chunk.value} n={chunk.next} />\n          </Suspense>\n        </>\n      );\n    }\n\n    return (\n      <Suspense fallback={chunk.value}>\n        <R c={chunk.value} n={chunk.next} />\n      </Suspense>\n    );\n  }) as unknown as React.FC<{\n    c: React.ReactNode;\n    n: Promise<ChunkType>;\n  }>,\n][0];\n\n/**\n * Creates a suspended chunk for React Server Components.\n *\n * This function generates a suspenseful React component that can be dynamically updated.\n * It's useful for streaming updates to the client in a React Server Components context.\n *\n * @param {React.ReactNode} initialValue - The initial value to render while the promise is pending.\n * @returns {Object} An object containing:\n *   - row: A React node that renders the suspenseful content.\n *   - resolve: A function to resolve the promise with a new value.\n *   - reject: A function to reject the promise with an error.\n */\nexport function createSuspendedChunk(initialValue: React.ReactNode): {\n  row: React.ReactNode;\n  resolve: (value: ChunkType) => void;\n  reject: (error: unknown) => void;\n} {\n  const { promise, resolve, reject } = createResolvablePromise<ChunkType>();\n\n  return {\n    row: (\n      <Suspense fallback={initialValue}>\n        <R c={initialValue} n={promise} />\n      </Suspense>\n    ),\n    resolve,\n    reject,\n  };\n}\n","import { HANGING_STREAM_WARNING_TIME_MS } from '../util/constants';\nimport { createResolvablePromise } from '../util/create-resolvable-promise';\nimport { createSuspendedChunk } from './create-suspended-chunk';\n\n// It's necessary to define the type manually here, otherwise TypeScript compiler\n// will not be able to infer the correct return type as it's circular.\ntype StreamableUIWrapper = {\n  /**\n   * The value of the streamable UI. This can be returned from a Server Action and received by the client.\n   */\n  readonly value: React.ReactNode;\n\n  /**\n   * This method updates the current UI node. It takes a new UI node and replaces the old one.\n   */\n  update(value: React.ReactNode): StreamableUIWrapper;\n\n  /**\n   * This method is used to append a new UI node to the end of the old one.\n   * Once appended a new UI node, the previous UI node cannot be updated anymore.\n   *\n   * @example\n   * ```jsx\n   * const ui = createStreamableUI(<div>hello</div>)\n   * ui.append(<div>world</div>)\n   *\n   * // The UI node will be:\n   * // <>\n   * //   <div>hello</div>\n   * //   <div>world</div>\n   * // </>\n   * ```\n   */\n  append(value: React.ReactNode): StreamableUIWrapper;\n\n  /**\n   * This method is used to signal that there is an error in the UI stream.\n   * It will be thrown on the client side and caught by the nearest error boundary component.\n   */\n  error(error: any): StreamableUIWrapper;\n\n  /**\n   * This method marks the UI node as finalized. You can either call it without any parameters or with a new UI node as the final state.\n   * Once called, the UI node cannot be updated or appended anymore.\n   *\n   * This method is always **required** to be called, otherwise the response will be stuck in a loading state.\n   */\n  done(...args: [React.ReactNode] | []): StreamableUIWrapper;\n};\n\n/**\n * Create a piece of changeable UI that can be streamed to the client.\n * On the client side, it can be rendered as a normal React node.\n */\nfunction createStreamableUI(initialValue?: React.ReactNode) {\n  let currentValue = initialValue;\n  let closed = false;\n  let { row, resolve, reject } = createSuspendedChunk(initialValue);\n\n  function assertStream(method: string) {\n    if (closed) {\n      throw new Error(method + ': UI stream is already closed.');\n    }\n  }\n\n  let warningTimeout: NodeJS.Timeout | undefined;\n  function warnUnclosedStream() {\n    if (process.env.NODE_ENV === 'development') {\n      if (warningTimeout) {\n        clearTimeout(warningTimeout);\n      }\n      warningTimeout = setTimeout(() => {\n        console.warn(\n          'The streamable UI has been slow to update. This may be a bug or a performance issue or you forgot to call `.done()`.',\n        );\n      }, HANGING_STREAM_WARNING_TIME_MS);\n    }\n  }\n  warnUnclosedStream();\n\n  const streamable: StreamableUIWrapper = {\n    value: row,\n    update(value: React.ReactNode) {\n      assertStream('.update()');\n\n      // There is no need to update the value if it's referentially equal.\n      if (value === currentValue) {\n        warnUnclosedStream();\n        return streamable;\n      }\n\n      const resolvable = createResolvablePromise();\n      currentValue = value;\n\n      resolve({ value: currentValue, done: false, next: resolvable.promise });\n      resolve = resolvable.resolve;\n      reject = resolvable.reject;\n\n      warnUnclosedStream();\n\n      return streamable;\n    },\n    append(value: React.ReactNode) {\n      assertStream('.append()');\n\n      const resolvable = createResolvablePromise();\n      currentValue = value;\n\n      resolve({ value, done: false, append: true, next: resolvable.promise });\n      resolve = resolvable.resolve;\n      reject = resolvable.reject;\n\n      warnUnclosedStream();\n\n      return streamable;\n    },\n    error(error: any) {\n      assertStream('.error()');\n\n      if (warningTimeout) {\n        clearTimeout(warningTimeout);\n      }\n      closed = true;\n      reject(error);\n\n      return streamable;\n    },\n    done(...args: [] | [React.ReactNode]) {\n      assertStream('.done()');\n\n      if (warningTimeout) {\n        clearTimeout(warningTimeout);\n      }\n      closed = true;\n      if (args.length) {\n        resolve({ value: args[0], done: true });\n        return streamable;\n      }\n      resolve({ value: currentValue, done: true });\n\n      return streamable;\n    },\n  };\n\n  return streamable;\n}\n\nexport { createStreamableUI };\n","export const STREAMABLE_VALUE_TYPE = Symbol.for('ui.streamable.value');\n\nexport type StreamablePatch = undefined | [0, string]; 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This can be returned from a Server Action and\n   * received by the client. To read the streamed values, use the\n   * `readStreamableValue` or `useStreamableValue` APIs.\n   */\n  readonly value: StreamableValue<T, E>;\n\n  /**\n   * This method updates the current value with a new one.\n   */\n  update(value: T): StreamableValueWrapper<T, E>;\n\n  /**\n   * This method is used to append a delta string to the current value. It\n   * requires the current value of the streamable to be a string.\n   *\n   * @example\n   * ```jsx\n   * const streamable = createStreamableValue('hello');\n   * streamable.append(' world');\n   *\n   * // The value will be 'hello world'\n   * ```\n   */\n  append(value: T): StreamableValueWrapper<T, E>;\n\n  /**\n   * This method is used to signal that there is an error in the value stream.\n   * It will be thrown on the client side when consumed via\n   * `readStreamableValue` or `useStreamableValue`.\n   */\n  error(error: any): StreamableValueWrapper<T, E>;\n\n  /**\n   * This method marks the value as finalized. You can either call it without\n   * any parameters or with a new value as the final state.\n   * Once called, the value cannot be updated or appended anymore.\n   *\n   * This method is always **required** to be called, otherwise the response\n   * will be stuck in a loading state.\n   */\n  done(...args: [T] | []): StreamableValueWrapper<T, E>;\n\n  /**\n   * @internal This is an internal lock to prevent the value from being\n   * updated by the user.\n   */\n  [STREAMABLE_VALUE_INTERNAL_LOCK]: boolean;\n};\n\nfunction createStreamableValueImpl<T = any, E = any>(initialValue?: T) {\n  let closed = false;\n  let locked = false;\n  let resolvable = createResolvablePromise<StreamableValue<T, E>>();\n\n  let currentValue = initialValue;\n  let currentError: E | undefined;\n  let currentPromise: typeof resolvable.promise | undefined =\n    resolvable.promise;\n  let currentPatchValue: StreamablePatch;\n\n  function assertStream(method: string) {\n    if (closed) {\n      throw new Error(method + ': Value stream is already closed.');\n    }\n    if (locked) {\n      throw new Error(\n        method + ': Value stream is locked and cannot be updated.',\n      );\n    }\n  }\n\n  let warningTimeout: NodeJS.Timeout | undefined;\n  function warnUnclosedStream() {\n    if (process.env.NODE_ENV === 'development') {\n      if (warningTimeout) {\n        clearTimeout(warningTimeout);\n      }\n      warningTimeout = setTimeout(() => {\n        console.warn(\n          'The streamable value has been slow to update. 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