/**
 * calendar-api-shared.ts, the bearer-auth HTTP helper and honest degraded-state
 * mapping shared by the Google Calendar and Microsoft Graph clients. Every failed
 * response is turned into a NAMED ApiDegradedState (never a generic throw): a 401 is
 * `reconnect-needed`, a 403 that names a missing scope is `insufficient-scope` naming
 * that scope, a 429 is `rate-limited` carrying the honored Retry-After, everything
 * else is `provider-error` with the status.
 */
import type { ApiDegradedState, CalendarProviderId, HttpFetch, HttpResponse } from './oauth-types.js';
/** A named, honest API failure. */
export declare class CalendarApiError extends Error {
    readonly degraded: ApiDegradedState;
    constructor(degraded: ApiDegradedState);
}
/** Map a non-OK response to a CalendarApiError with a named degraded state. */
export declare function errorFromResponse(res: HttpResponse, provider: CalendarProviderId): Promise<CalendarApiError>;
/** Issue a bearer-authorized request, throwing a CalendarApiError on failure. */
export declare function authedRequest(fetchImpl: HttpFetch, provider: CalendarProviderId, input: {
    readonly url: string;
    readonly method: 'GET' | 'POST';
    readonly token: string;
    readonly body?: unknown;
    readonly extraHeaders?: Readonly<Record<string, string>>;
}): Promise<unknown>;
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