import type { ChatUiMessage, ChatUiMessageChunk, MessageMetadata } from "./types.js";
/** Default value for stream promise timeout ms. */
export declare const DEFAULT_STREAM_PROMISE_TIMEOUT_MS = 10000;
/** Public API contract for chat fallback part. */
export type ChatFallbackPart = ChatUiMessage["parts"][number];
/** Public API contract for chat part. */
type ChatPart = ChatFallbackPart;
/** Public API contract for final step tool call. */
export interface FinalStepToolCall {
    toolCallId: string;
    toolName: string;
    input: unknown;
}
/** Result returned from final step tool. */
export interface FinalStepToolResult {
    toolCallId: string;
    toolName: string;
    input: unknown;
    output: unknown;
}
/** State for fallback tool chunk. */
export interface FallbackToolChunkState {
    startedToolCallIds: ReadonlySet<string>;
    inputAvailableToolCallIds: ReadonlySet<string>;
    outputAvailableToolCallIds: ReadonlySet<string>;
    outputErrorToolCallIds?: ReadonlySet<string>;
    outputDeniedToolCallIds?: ReadonlySet<string>;
}
/** Error shape for final step terminal. */
interface FinalStepTerminalError {
    code: string;
    message: string;
}
/** Return last stream step. */
export declare function getLastStreamStep(result: {
    steps: PromiseLike<readonly unknown[]>;
}, timeoutMs?: number): Promise<unknown | null>;
/** Return stream steps. */
export declare function getStreamSteps(result: {
    steps: PromiseLike<readonly unknown[]>;
}, timeoutMs?: number): Promise<{
    steps: readonly unknown[];
    lastStep: unknown | null;
}>;
/** Extract final step finish reason. */
export declare function extractFinalStepFinishReason(step: unknown): string | null;
/** Extract final step text. */
export declare function extractFinalStepText(step: unknown): string;
/** Extract final step tool calls. */
export declare function extractFinalStepToolCalls(step: unknown): FinalStepToolCall[];
/** Extract final step tool results. */
export declare function extractFinalStepToolResults(step: unknown): FinalStepToolResult[];
/** Error shape for extract final step terminal. */
export declare function extractFinalStepTerminalError(step: unknown): FinalStepTerminalError | null;
/** Builds fallback UI message parts. */
export declare function buildFallbackUiMessageParts(step: unknown): ChatPart[];
/** Append missing fallback text part. */
export declare function appendMissingFallbackTextPart(parts: readonly ChatPart[], step: unknown): ChatPart[];
/** Builds fallback UI message chunks. */
export declare function buildFallbackUiMessageChunks(step: unknown, messageId: string): ChatUiMessageChunk<MessageMetadata>[];
/** Builds missing fallback tool chunks. */
export declare function buildMissingFallbackToolChunks(step: unknown, state?: Partial<FallbackToolChunkState>): ChatUiMessageChunk<MessageMetadata>[];
/** Builds missing fallback tool chunks from parts. */
export declare function buildMissingFallbackToolChunksFromParts(parts: readonly ChatPart[], state?: Partial<FallbackToolChunkState>): ChatUiMessageChunk<MessageMetadata>[];
/** Builds missing fallback text chunks. */
export declare function buildMissingFallbackTextChunks(parts: readonly ChatPart[], step: unknown, messageId: string): ChatUiMessageChunk<MessageMetadata>[];
export {};
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