/**
 * Utility helpers for detecting Global Privacy Control (GPC) signals.
 *
 * @remarks
 * GPC is a browser-level signal that indicates a user's preference to opt out
 * of the sale or sharing of their personal data (e.g. CCPA/CPRA).
 *
 * This helper is intentionally conservative and only checks for the presence
 * of the client-side `navigator.globalPrivacyControl` flag.
 *
 * @see https://globalprivacycontrol.org/ for the GPC specification.
 *
 * @internal
 */
export declare function hasGlobalPrivacyControlSignal(): boolean;