import type { ChatMessageMetadata, ChatUiMessageChunk } from "../../chat/protocol.js";
import type { HostedStreamPartForUiChunkMapping } from "../../chat/hosted-ui-chunk-mapping.js";
/** Public API contract for hosted child chunk mirror. */
export interface HostedChildChunkMirror {
    handleChunk(chunk: ChatUiMessageChunk<ChatMessageMetadata>): Promise<void> | void;
}
/** State for hosted child mirror. */
export interface HostedChildMirrorState {
    reasoningStarted: boolean;
    textStarted: boolean;
}
/** Context for hosted child mirror. */
export interface HostedChildMirrorContext {
    mirror: HostedChildChunkMirror | null;
    messageId: string | null;
    reasoningMessageId: string | null;
    state: HostedChildMirrorState;
    appendChunk: (chunk: ChatUiMessageChunk<ChatMessageMetadata>) => Promise<void>;
    closeReasoningSegment: () => Promise<void>;
    closeTextSegment: () => Promise<void>;
    markStepStarted: () => void;
    hasStartedStep: () => boolean;
    hasEmittedProgress: () => boolean;
}
type CoreMirroredPartType = "reasoning-delta" | "text-delta" | "tool-input-start" | "tool-input-delta" | "tool-call" | "tool-result";
type MirroredPartType = CoreMirroredPartType | "source" | "tool-error" | "error";
type DurableMirrorChunkType = ChatUiMessageChunk<ChatMessageMetadata>["type"];
/** Check whether a hosted chunk was already mirrored. */
export declare function isAlreadyMirroredHostedChunk(partType: MirroredPartType, mirroredChunkType: DurableMirrorChunkType): boolean;
type MirroredHostedStreamPart = Extract<HostedStreamPartForUiChunkMapping, {
    type: "reasoning-delta";
} | {
    type: "text-delta";
} | {
    type: "source";
} | {
    type: "tool-input-start";
} | {
    type: "tool-call";
} | {
    type: "tool-input-delta";
} | {
    type: "tool-result";
} | {
    type: "tool-error";
} | {
    type: "error";
}>;
type HostedMirrorBasePart = {
    type: "reasoning-delta";
    text: string;
} | {
    type: "text-delta";
    text: string;
} | {
    type: "tool-input-start";
    toolCallId: string;
    toolName: string;
} | {
    type: "tool-input-delta";
    toolCallId: string;
    delta: string;
} | {
    type: "tool-call";
    toolCallId: string;
    toolName: string;
    input: unknown;
} | {
    type: "tool-result";
    toolCallId: string;
    toolName: string;
    input: unknown;
    output: unknown;
} | {
    type: "tool-error";
    toolCallId: string;
    toolName: string;
    input: unknown;
    error: Error;
} | {
    type: "error";
    error: Error;
};
type ExtraMirroredHostedStreamPart = Extract<HostedStreamPartForUiChunkMapping, {
    type: "source";
}>;
/** Public API contract for hosted child mirror part. */
export type HostedChildMirrorPart = HostedMirrorBasePart | ExtraMirroredHostedStreamPart;
/** Converts a value to mirrored hosted stream part. */
export declare function toMirroredHostedStreamPart(part: HostedChildMirrorPart, ids: {
    messageId: string | null;
    reasoningMessageId: string | null;
}): MirroredHostedStreamPart;
/** Append hosted child mirror chunk. */
export declare function appendHostedChildMirrorChunk(input: {
    mirror: HostedChildChunkMirror | null;
    chunk: ChatUiMessageChunk<ChatMessageMetadata>;
}): Promise<boolean>;
/** Close hosted child reasoning segment helper. */
export declare function closeHostedChildReasoningSegment(input: {
    mirror: HostedChildChunkMirror | null;
    reasoningMessageId: string | null;
    state: HostedChildMirrorState;
}): Promise<void>;
/** Close hosted child text segment helper. */
export declare function closeHostedChildTextSegment(input: {
    mirror: HostedChildChunkMirror | null;
    messageId: string | null;
    state: HostedChildMirrorState;
}): Promise<void>;
/** Context for create hosted child mirror. */
export declare function createHostedChildMirrorContext(input: {
    mirror: HostedChildChunkMirror | null;
    messageId?: string | null;
    reasoningMessageId?: string | null;
}): HostedChildMirrorContext;
export {};
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