/**
 * Performance optimizations for DNS validation
 */
import type { UnknownRecord } from "type-fest";
import type { DNSRecordType } from "./types";
/**
 * Test hook for exercising cache miss/hit branches.
 *
 * @internal
 */
export declare const testGetCachedRegex: (pattern: string, flags?: string) => RegExp;
/**
 * Name of a precompiled validation pattern.
 */
export type ValidationPatternName = "email" | "fqdn" | "hex" | "ipv4";
/**
 * Pre-compiled regex patterns for common validations.
 */
export declare const ValidationPatterns: Readonly<Record<ValidationPatternName, RegExp>>;
/**
 * Fast pre-validation using regex patterns Returns null if validation should
 * proceed, or false if definitely invalid
 */
export declare function fastPreValidate(value: string, pattern: ValidationPatternName): boolean | null;
/**
 * Optimized type checking with early returns
 */
export declare function isPlainObject(value: unknown): value is UnknownRecord;
/**
 * Optimized field access for optional fields.
 */
export declare function getOptionalField(obj: Readonly<UnknownRecord>, field: Readonly<string>, expectedType: "boolean" | "number" | "object" | "string"): unknown;
/**
 * Optimized field access with type checking.
 */
export declare function getRequiredField(obj: Readonly<UnknownRecord>, field: Readonly<string>, expectedType: "boolean" | "number" | "object" | "string"): unknown;
/**
 * Fast integer range validation
 */
export declare function isValidIntegerInRange(value: unknown, min: number, max: number): value is number;
/**
 * Validation performance metrics
 */
export interface ValidationMetrics {
    averageTimeMs: number;
    cacheHits: number;
    cacheMisses: number;
    successfulValidations: number;
    totalValidations: number;
}
/**
 * Performance tracking for validation operations
 */
export declare class ValidationPerformanceTracker {
    private metrics;
    private totalTime;
    getMetrics(): ValidationMetrics;
    recordCacheHit(): void;
    recordCacheMiss(): void;
    recordSuccess(): void;
    reset(): void;
    startValidation(): () => void;
    private recordValidation;
}
/**
 * Fast record type validation
 */
export declare function isValidRecordType(type: unknown): type is DNSRecordType;
/**
 * Global performance tracker instance
 */
export declare const globalPerformanceTracker: ValidationPerformanceTracker;
/**
 * Decorator for tracking validation performance
 */
export declare function trackPerformance<Arguments extends unknown[], Return>(validationFn: (...args: Arguments) => Return, tracker?: ValidationPerformanceTracker): (...args: Arguments) => Return;
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