/**
 * Registration-link block — the shared, pure href/label logic.
 *
 * This block renders a call-to-action button pointing at a sign-up URL and is
 * droppable into any BlockTuple[] content (articles, projects, explainers,
 * contests, and the contest email body). No server route validates block
 * content against a schema, so URL safety MUST live in one place and be applied
 * by every renderer — this module is that single source, imported by the Vue
 * view (`BlockRegistrationLinkView`) AND the email HTML renderer
 * (`renderEmailBlocks`).
 */
/** Default sign-up destination when the block leaves its URL blank. Root-relative
 *  so it resolves against whatever host the instance serves. */
export declare const REGISTRATION_DEFAULT_URL = "/auth/register";
export interface RegistrationLinkContent {
    /** CTA button label. Blank ⇒ "Register". */
    label?: string;
    /** Destination. Blank or not an allowed anchor target ⇒ REGISTRATION_DEFAULT_URL. */
    url?: string;
    /** Optional referral code (session 229 referralLinks) appended as `?ref=<code>`
     *  for signup attribution. Harmless when referralLinks is off — the register
     *  page simply ignores an unrecognized ref. */
    ref?: string;
    /** Visual style hint. */
    variant?: 'primary' | 'secondary';
}
type MaybeContent = RegistrationLinkContent | Record<string, unknown>;
/**
 * Resolve the SAFE href for a registration-link block. Falls back to the
 * register page when the URL is blank or not an allowed anchor target
 * (http(s), root path, fragment, mailto, tel — `URL_LINK_STRICT`; blocks
 * `javascript:` and other smuggles). A referral code is appended as a query
 * param, but only to http(s)/root targets (never a fragment/mailto/tel).
 */
export declare function buildRegistrationHref(content: MaybeContent): string;
/** Resolve the button label, defaulting to "Register" when blank. */
export declare function registrationLabel(content: MaybeContent): string;
/** The button style hint, defaulting to primary. */
export declare function registrationVariant(content: MaybeContent): 'primary' | 'secondary';
export {};
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