import type { ProviderConfig, AnyRecord, RecordWithTtl, CaaRecord, MxRecord, NaptrRecord, SoaRecord, SrvRecord, TlsaRecord, ResolveOptions, ResolveWithTtlOptions, DoHResponse, RecordType, AbortOptions } from '../types.cjs';
type ProviderLimit = NonNullable<ProviderConfig['limit']>;
type DnsResponseError = Error & {
    code?: string;
    errno?: number;
    hostname?: string;
    syscall?: string;
};
export declare function badResponseError(hostname: string, type: RecordType, reason: string): DnsResponseError;
/**
 * Google DNS-over-HTTPS provider.
 */
export declare class DoHProvider {
    private queueGeneration;
    private readonly queueGenerations;
    private config;
    private readonly defaultQueueOptions;
    protected dohRequest: (hostname: string, type: RecordType, signal?: AbortSignal) => Promise<DoHResponse>;
    /**
     * Creates a new Google DoH provider instance.
     * @param config - Provider configuration
     */
    constructor(config: ProviderConfig | undefined, defaultQueueOptions: ProviderLimit);
    /**
     * Updates the provider configuration.
     * @param config - New configuration
     */
    updateConfig(config: ProviderConfig): void;
    /**
     * Create an immutable queue generation. A replacement waits for every
     * operation submitted to its predecessor to settle before accepting new
     * upstream work. This keeps rapid configuration changes ordered without
     * abandoning callers already queued under an older rate policy.
     */
    private createQueueGeneration;
    private retireQueueGeneration;
    private resolveDrainedGeneration;
    /**
     * Checks if the provider is enabled.
     */
    get enabled(): boolean;
    /**
     * Gets the current queue size.
     */
    get queueSize(): number;
    /**
     * Gets the configured concurrency limit for this provider.
     */
    get concurrency(): number;
    /**
     * Checks if the queue is at capacity.
     */
    get isFull(): boolean;
    /**
     * Executes a function through the queue with abort/timeout support.
     */
    private executeQueued;
    /**
     * Converts DoH response to Node.js DNS format.
     */
    private parseDoHResponse;
    /**
     * Resolves A records for a hostname.
     */
    resolve4(hostname: string): Promise<string[]>;
    resolve4(hostname: string, options: ResolveWithTtlOptions): Promise<RecordWithTtl[]>;
    resolve4(hostname: string, options?: ResolveOptions): Promise<string[] | RecordWithTtl[]>;
    /**
     * Resolves AAAA records for a hostname.
     */
    resolve6(hostname: string): Promise<string[]>;
    resolve6(hostname: string, options: ResolveWithTtlOptions): Promise<RecordWithTtl[]>;
    resolve6(hostname: string, options?: ResolveOptions): Promise<string[] | RecordWithTtl[]>;
    /**
     * Resolves ANY records for a hostname.
     */
    resolveAny(hostname: string, options?: AbortOptions): Promise<AnyRecord[]>;
    /**
     * Resolves CAA records for a hostname.
     */
    resolveCaa(hostname: string, options?: AbortOptions): Promise<CaaRecord[]>;
    /**
     * Resolves CNAME records for a hostname.
     */
    resolveCname(hostname: string, options?: AbortOptions): Promise<string[]>;
    /**
     * Resolves MX records for a hostname.
     */
    resolveMx(hostname: string, options?: AbortOptions): Promise<MxRecord[]>;
    /**
     * Resolves NAPTR records for a hostname.
     */
    resolveNaptr(hostname: string, options?: AbortOptions): Promise<NaptrRecord[]>;
    /**
     * Resolves NS records for a hostname.
     */
    resolveNs(hostname: string, options?: AbortOptions): Promise<string[]>;
    /**
     * Resolves PTR records for an IP address.
     */
    resolvePtr(hostname: string, options?: AbortOptions): Promise<string[]>;
    /**
     * Resolves SOA record for a hostname.
     */
    resolveSoa(hostname: string, options?: AbortOptions): Promise<SoaRecord>;
    /**
     * Resolves SRV records for a hostname.
     */
    resolveSrv(hostname: string, options?: AbortOptions): Promise<SrvRecord[]>;
    /**
     * Resolves TLSA records for a hostname.
     */
    resolveTlsa(hostname: string, options?: AbortOptions): Promise<TlsaRecord[]>;
    /**
     * Resolves TXT records for a hostname.
     */
    resolveTxt(hostname: string, options?: AbortOptions): Promise<string[][]>;
    /**
     * Performs reverse DNS lookup for an IP address.
     */
    reverse(ip: string, options?: AbortOptions): Promise<string[]>;
    /**
     * Generic resolve method that delegates to specific resolve methods.
     */
    resolve(hostname: string): Promise<string[]>;
    resolve(hostname: string, rrtype: "A"): Promise<string[]>;
    resolve(hostname: string, rrtype: "AAAA"): Promise<string[]>;
    resolve(hostname: string, rrtype: "ANY"): Promise<AnyRecord[]>;
    resolve(hostname: string, rrtype: "CAA"): Promise<CaaRecord[]>;
    resolve(hostname: string, rrtype: "CNAME"): Promise<string[]>;
    resolve(hostname: string, rrtype: "MX"): Promise<MxRecord[]>;
    resolve(hostname: string, rrtype: "NAPTR"): Promise<NaptrRecord[]>;
    resolve(hostname: string, rrtype: "NS"): Promise<string[]>;
    resolve(hostname: string, rrtype: "PTR"): Promise<string[]>;
    resolve(hostname: string, rrtype: "SOA"): Promise<SoaRecord>;
    resolve(hostname: string, rrtype: "SRV"): Promise<SrvRecord[]>;
    resolve(hostname: string, rrtype: "TLSA"): Promise<TlsaRecord[]>;
    resolve(hostname: string, rrtype: "TXT"): Promise<string[][]>;
}
export {};