/**
 * Official Zero Ad Network public key.
 * Used to verify that `X-Better-Web-Hello` header values are authentic
 * and have not been tampered with.
 */
declare const ZEROAD_NETWORK_PUBLIC_KEY: string;
/**
 * IMPORTANT: Requirements listed for each feature class MUST be fulfilled fully.
 * Failure to comply will result in the site getting banned from Zero Ad Network platform.
 */
declare enum FEATURE {
    /**
     * Feature requirements:
     *  - Disable all advertisements on the page;
     *  - Disable all Cookie Consent screens (headers, footers, or dialogs);
     *  - Fully opt out the user of non-functional trackers;
     *  - Disable all marketing dialogs or popups (newsletters, promotions, etc.).
     */
    CLEAN_WEB = 1,
    /**
     * Feature requirements:
     *  - Provide Free access to content behind a paywall (news, articles, etc.);
     *  - Provide Free access to your base subscription plan (if subscription model is present).
     */
    ONE_PASS = 2
}
declare enum SERVER_HEADER {
    WELCOME = "X-Better-Web-Welcome"
}
declare enum CLIENT_HEADER {
    HELLO = "X-Better-Web-Hello"
}
declare enum PROTOCOL_VERSION {
    V_1 = 1
}
declare const CURRENT_PROTOCOL_VERSION = PROTOCOL_VERSION.V_1;

declare function encodeServerHeader(clientId: string, features: FEATURE[]): string;
type WelcomeHeader = {
    clientId: string;
    version: PROTOCOL_VERSION;
    features: (keyof typeof FEATURE)[];
};
declare function decodeServerHeader(headerValue: string | null | undefined): WelcomeHeader | undefined;

export { CLIENT_HEADER as C, FEATURE as F, PROTOCOL_VERSION as P, SERVER_HEADER as S, ZEROAD_NETWORK_PUBLIC_KEY as Z, CURRENT_PROTOCOL_VERSION as a, decodeServerHeader as d, encodeServerHeader as e };
export type { WelcomeHeader as W };