import { UIMessage } from '../../../types.js';
import { ToolCallState, ToolResultState } from './types.js';
/**
 * Update or add a text part to a message.
 *
 * If the last part is a text part, update it (continuing the same text segment).
 * Otherwise, create a new text part (starting a new text segment after tool calls).
 */
export declare function updateTextPart(messages: Array<UIMessage>, messageId: string, content: string): Array<UIMessage>;
/**
 * Update or add a tool call part to a message.
 */
export declare function updateToolCallPart(messages: Array<UIMessage>, messageId: string, toolCall: {
    id: string;
    name: string;
    arguments: string;
    state: ToolCallState;
}): Array<UIMessage>;
/**
 * Update or add a tool result part to a message.
 */
export declare function updateToolResultPart(messages: Array<UIMessage>, messageId: string, toolCallId: string, content: string, state: ToolResultState, error?: string): Array<UIMessage>;
/**
 * Update a tool call part with approval request metadata.
 */
export declare function updateToolCallApproval(messages: Array<UIMessage>, messageId: string, toolCallId: string, approvalId: string): Array<UIMessage>;
/**
 * Update a tool call part's state (e.g., to "input-complete").
 */
export declare function updateToolCallState(messages: Array<UIMessage>, messageId: string, toolCallId: string, state: ToolCallState): Array<UIMessage>;
/**
 * Update a tool call part with output.
 * Searches all messages to find the tool call by ID.
 */
export declare function updateToolCallWithOutput(messages: Array<UIMessage>, toolCallId: string, output: any, state?: ToolCallState, errorText?: string): Array<UIMessage>;
/**
 * Update a tool call part with approval response.
 * Searches all messages to find the tool call by approval ID.
 */
export declare function updateToolCallApprovalResponse(messages: Array<UIMessage>, approvalId: string, approved: boolean): Array<UIMessage>;
/**
 * Update or add a thinking part to a message.
 */
export declare function updateThinkingPart(messages: Array<UIMessage>, messageId: string, content: string): Array<UIMessage>;