/**
 * Minimal OpenGraph-enriched HTML landing page for the `/` of a Worker.
 *
 * Meta's WhatsApp crawler renders a card preview for URL buttons in
 * templates. Without OG tags on the button's target, the preview shows the
 * bare `*.workers.dev` domain — bad look. This helper returns a tiny HTML
 * page with OG + Twitter meta tags + an optional human redirect. Consumers
 * wire it at `app.get('/', c => new Response(landingHtml({...}), {headers}))`.
 *
 * The `redirectTo` value drives a `<meta http-equiv="refresh">` — humans
 * bounce to your real site after `redirectDelaySeconds`; the WhatsApp
 * crawler stops at the first HTML response and reads OG tags there.
 */
export interface LandingHtmlOptions {
    /** OG title + `<title>`. Required. */
    title: string;
    /** OG description + Twitter description + `<meta name="description">`. Required. */
    description: string;
    /** `og:url` — canonical URL of this page. Required. */
    url: string;
    /** Where a human viewer should end up. When set, adds a meta-refresh redirect. */
    redirectTo?: string;
    /** Redirect delay in seconds. Default 2. Ignored when `redirectTo` is empty. */
    redirectDelaySeconds?: number;
    /** `og:site_name`. Default = title. */
    siteName?: string;
    /** `og:locale`. Default `pt_BR`. */
    locale?: string;
    /** BCP-47 language for `<html lang>`. Default `pt-BR`. */
    lang?: string;
    /** `og:image` URL. Optional. */
    image?: string;
    /** Emoji or short glyph shown above the title in the body. Default `⚡`. */
    glyph?: string;
    /**
     * `Cache-Control` value returned in headers when consumers use the
     * `landingResponse` helper. Default `public, max-age=3600` so Meta's
     * crawler doesn't refetch every send.
     */
    cacheControl?: string;
}
/**
 * Render the HTML string. `cacheControl` is ignored here — use it via
 * `landingResponse` when constructing the `Response`.
 */
export declare function landingHtml(opts: LandingHtmlOptions): string;
/**
 * Convenience — build a full `Response` with sensible headers.
 *
 *   app.get('/', () => landingResponse({ title: 'Zap Prime', description: '...', url: env.PUBLIC_BASE_URL, redirectTo: 'https://propmind.co' }));
 */
export declare function landingResponse(opts: LandingHtmlOptions): Response;
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