import type { ProviderDetection, RemoteProvider, RemoteProviderId } from './types';
/**
 * Preference order, most preferred first.
 *
 * Tailscale is first because it exposes the server only to the user's own
 * tailnet; the Cloudflare Quick Tunnel puts it on the public internet. The
 * order is data, not control flow — being second here never causes a fallback.
 */
export declare const REMOTE_PROVIDER_ORDER: readonly RemoteProviderId[];
/** The shipped Providers, in `REMOTE_PROVIDER_ORDER`. */
export declare function createRemoteProviders(): RemoteProvider[];
/** One Provider and what probing it just said. */
export interface ProviderCandidate {
    provider: RemoteProvider;
    detection: ProviderDetection;
}
/**
 * Probes every Provider and returns all of them in preference order.
 *
 * Every candidate comes back, including the unusable ones: the caller needs the
 * `reason` of the preferred Provider to explain why it is falling through to a
 * question rather than to a tunnel.
 *
 * A Provider whose `detect()` throws is reported as unavailable rather than
 * taking down the probe — a broken `tailscale` binary must not stop the user
 * from seeing that `cloudflared` exists.
 */
export declare function detectRemoteProviders(providers?: readonly RemoteProvider[]): Promise<ProviderCandidate[]>;
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