import type { ChatMessageMetadata, ChatUiMessageChunk } from "./protocol.js";
type StreamChunkMetadataPart = {
    type: string;
    totalUsage?: unknown;
};
/** Input payload for build chat stream chunk message metadata. */
export interface BuildChatStreamChunkMessageMetadataInput {
    agentId: string;
    modelId: string;
    runId?: string;
    streamingMessageId?: string;
    part: StreamChunkMetadataPart;
    agentName?: string;
    agentAvatarUrl?: string;
}
/** Normalizes chat message metadata. */
export declare function normalizeChatMessageMetadata(value: unknown): ChatMessageMetadata;
/** Extract chat message metadata. */
export declare function extractChatMessageMetadata(value: unknown): ChatMessageMetadata | undefined;
/** Builds chat stream chunk message metadata. */
export declare function buildChatStreamChunkMessageMetadata(input: BuildChatStreamChunkMessageMetadataInput): ChatMessageMetadata;
/** Normalizes chat UI message chunk. */
export declare function normalizeChatUiMessageChunk(chunk: ChatUiMessageChunk<unknown>): ChatUiMessageChunk<ChatMessageMetadata>;
/** Dedupe chat UI message chunks. */
export declare function dedupeChatUiMessageChunks<TMessageMetadata>(stream: AsyncIterable<ChatUiMessageChunk<TMessageMetadata>>): AsyncIterable<ChatUiMessageChunk<TMessageMetadata>>;
/** Normalizes chat UI message stream. */
export declare function normalizeChatUiMessageStream(stream: AsyncIterable<ChatUiMessageChunk<unknown>>): AsyncIterable<ChatUiMessageChunk<ChatMessageMetadata>>;
export {};
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