/**
 * Adapter error surface.
 *
 * `FanfareConfigurationError` is the fail-loud artifact of the mode state
 * machine: `FanfareShopifyProvider` throws it at mount when `mode:"production"`
 * is missing the `shopify.proxyBaseUrl` it needs for real verify + claim. A
 * thrown configuration error is deliberate — the no-op verifier path exists only
 * in `mode:"demo"`, so production never silently degrades to a client-only check.
 *
 * It is its own subclass (not a bare `Error`) so integrators can branch on
 * `instanceof FanfareConfigurationError` — e.g. surface a setup-time banner —
 * without string-matching the message.
 */
export declare class FanfareConfigurationError extends Error {
    constructor(message: string);
}