/**
 * Shared text utility functions for storage adapters.
 *
 * Both SQLite and Postgres adapters use identical logic for extracting,
 * normalizing, and truncating message preview text. This module provides
 * a single canonical implementation to avoid duplication.
 */
import type { Prompt } from '@effect/ai';
import type { ConversationMetadata, SessionSummary } from '../context';
/** Maximum character length for session preview text. */
export declare const PREVIEW_MAX_LENGTH = 120;
/** Collapse all whitespace runs to a single space and trim. */
export declare const normalizeWhitespace: (value: string) => string;
/** Truncate text to `maxLength`, appending an ellipsis if it exceeds the limit. */
export declare const truncateText: (value: string, maxLength: number) => string;
/** Convert an arbitrary value to a safe string representation. */
export declare const toSafeString: (value: unknown) => string;
/** Extract readable text from a single message content part. */
export declare const extractTextFromPart: (part: unknown) => string;
/** Extract the full text content from an encoded message. */
export declare const extractMessageText: (message: Prompt.MessageEncoded) => string;
/** Extract a normalized, truncated preview string from an encoded message. */
export declare const extractMessagePreviewText: (message: Prompt.MessageEncoded) => string | undefined;
/** Extract agent id/name from conversation metadata, returning undefined when absent. */
export declare const extractAgentMetadata: (metadata: ConversationMetadata) => SessionSummary["agent"] | undefined;
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