/**
 * String utilities for TONL encoding/decoding
 */
import type { TONLDelimiter } from "../types.js";
/**
 * Complexity limits for JSON parsing to prevent ReDoS
 */
interface ComplexityLimits {
    maxNesting: number;
    maxProperties: number;
    maxArrayLength: number;
}
/**
 * Safely parse JSON with protection against ReDoS attacks and memory exhaustion
 * BUG-FIX-004: Now accepts valid JSON primitives (null, true, false, numbers, strings)
 * @param jsonString - JSON string to parse (objects, arrays, or primitives)
 * @param limits - Optional complexity limits
 * @returns Parsed JSON value
 * @throws Error if JSON is invalid or exceeds limits
 */
export declare function safeJsonParse(jsonString: string, limits?: Partial<ComplexityLimits>): unknown;
/**
 * Check if a value needs quoting based on TONL quoting rules
 */
export declare function needsQuoting(value: string, delimiter: TONLDelimiter): boolean;
/**
 * Quote a value if needed according to TONL rules
 */
export declare function quoteIfNeeded(value: string, delimiter: TONLDelimiter): string;
/**
 * Unquote a value, handling backslash-escaped quotes and backslashes
 */
export declare function unquote(value: string): string;
/**
 * Handle triple-quoted content
 */
export declare function tripleQuoteIfNeeded(value: string, delimiter: TONLDelimiter): string;
/**
 * Create proper indentation string
 * BUG-FIX-002: Added validation to prevent string repeat DoS attacks
 * @param level - Indentation level (must be non-negative safe integer)
 * @param spaces - Spaces per level (must be 0-100, typically 2 or 4)
 * @returns Indentation string
 * @throws RangeError if parameters are invalid or result would be too large
 */
export declare function makeIndent(level: number, spaces: number): string;
export {};
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