/**
 * Shared JSON parsing helpers used by document-based chat parsers
 * (Telegram, Messenger, iMessage JSON bundles).
 */
import type { MediaType } from '../types';
export declare function isRecord(value: unknown): value is Record<string, unknown>;
export declare function getString(record: Record<string, unknown>, key: string): string | undefined;
export declare function hasValue(record: Record<string, unknown>, key: string): boolean;
export declare function isStringArray(value: unknown): value is readonly string[];
export declare function isHttpUrl(value: unknown): value is string;
/**
 * Parse a JSON document and throw a parser-specific error on failure.
 */
export declare function parseJsonOrThrow(raw: string, errorMessage: string): unknown;
/**
 * Deduplicate URLs while preserving insertion order.
 */
export declare function dedupeUrls(urls: readonly string[]): string[];
/**
 * Return the trimmed content, or fall back to a `[mediaType]` placeholder
 * when the message has no text but did carry media.
 */
export declare function applyMediaPlaceholder(content: string, mediaType: MediaType | undefined): string;
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