export interface LinkProvider {
    id: string;
    label: string;
    brand: string;
    /** For brands that are essentially black and vanish on a dark card. */
    brandDark?: string;
    hosts: string[];
    hostSuffixes?: string[];
    detail?: (url: URL) => string | null;
}
/** Seventy-three sites, and the seven that also read a line out of the path. */
export declare const LINK_PROVIDERS: LinkProvider[];
/** The hostname without `www.`, or the input when that was not a URL. */
export declare function hostnameOf(url: string): string;
export declare function getLinkProvider(url: string): LinkProvider | null;
/** The line a provider can read out of the path, if it knows how. */
export declare function getProviderDetail(url: string): string | null;
/**
 * The accent a card is drawn with: the brand where we know it, the colour the page declared
 * where we do not, and null for the app's own accent when neither is on offer.
 */
export declare function getAccentColor(url: string, themeColor: string | null | undefined, appearance: "light" | "dark"): string | null;