/**
 * Service for interacting with the MSC GeoMet weather-alerts API
 * (Environment and Climate Change Canada) —
 * https://api.weather.gc.ca/collections/weather-alerts
 *
 * A keyless OGC API Features endpoint. Queried with a small bbox (±0.25°)
 * around a point, `f=json`. Live-verified (2026-08-13, see "MSC GeoMet
 * (Canada)" in `docs/plans/international-alerts-plan.md`): a zero-result bbox
 * returns HTTP 200 with `numberMatched: 0` — the happy empty path, not an
 * error — and `status_en: "ended"` items **remain in the collection**, so
 * expiry filtering is always required at read time (both on a fresh fetch
 * and on a cache hit, since a cached feature can cross its own expiry
 * between fetch and a later read).
 *
 * Like `acis.ts`, this is not one of the project's original data sources —
 * errors surface as plain, sanitized `Error`s (no `ApiError` union changes).
 */
import type { GeoMetAlertFeature } from '../types/geomet.js';
export interface GeoMetServiceConfig {
    baseURL?: string;
    timeout?: number;
    maxRetries?: number;
}
/**
 * Filter a raw feature list down to alerts that are still active: drops
 * features whose `status_en` means ended/expired, and features whose
 * `expiration_datetime` is in the past. Pure function, no I/O — applied on
 * every `getAlerts` return (fresh fetch or cache hit) so a cached entry
 * never serves a just-expired alert.
 */
export declare function filterActiveGeoMetAlerts(features: GeoMetAlertFeature[], now?: Date): GeoMetAlertFeature[];
/**
 * MSC GeoMet (Environment and Climate Change Canada) weather-alerts API
 * client. No API key required.
 */
export declare class GeoMetService {
    private client;
    private cache;
    private maxRetries;
    constructor(config?: GeoMetServiceConfig);
    /**
     * Fetch currently active weather alerts near a point from MSC GeoMet.
     * Queries a small bbox (±0.25°) around the coordinates and returns only
     * unexpired, non-ended features — expiry filtering is applied both to a
     * fresh fetch and to a cache hit, since raw (unfiltered) results are what
     * gets cached.
     */
    getAlerts(latitude: number, longitude: number): Promise<GeoMetAlertFeature[]>;
    /**
     * Request with retry/backoff, mirroring `NOAAService.makeRequest`
     * (`src/services/noaa.ts:175-199`): exponential backoff with jitter,
     * retrying only on messages that indicate a transient failure (rate
     * limit, server error, timeout).
     * @private
     */
    private makeRequest;
    /**
     * Handle API errors. GeoMet has no service literal in `ApiError` (it is
     * not one of the project's original data sources), so errors are
     * surfaced as plain, sanitized `Error`s — following `AcisService`'s
     * precedent (`src/services/acis.ts`).
     * @private
     */
    private handleError;
}
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