import { PKCEConfig } from "../types";
export declare class PKCEService<TContext> {
    private config;
    constructor(config: PKCEConfig<TContext>);
    private defaultGenerateCodeChallenge;
    generateCodeVerifier(context: TContext): Promise<string>;
    extractCodeVerifier(context: TContext): string | undefined;
    generateCodeChallenge(codeVerifier: string, context: TContext): Promise<string>;
    extractCodeChallenge(context: TContext): string | undefined;
    isCodeVerifierExpired(context: TContext): Promise<boolean>;
    isCodeChallengeExpired(context: TContext): Promise<boolean>;
    clearCodeVerifier(context: TContext): Promise<void>;
    clearCodeChallenge(context: TContext): Promise<void>;
}