import type { Contexts, EvaluationPayload, CollectContextMode } from "./types";
export type LoaderParams = {
    sdkKey: string;
    contexts: Contexts;
    /** Ordered list of API base URLs to try for failover. */
    apiUrls?: string[];
    /**
     * Active domain used to derive default apiUrls when `apiUrls` is omitted.
     * See `InitOptions.domain` for resolution order.
     */
    domain?: string;
    timeout?: number;
    collectContextMode?: CollectContextMode;
    clientVersion?: string;
};
export default class Loader {
    sdkKey: string;
    contexts: Contexts;
    apiUrls: string[];
    timeout: number;
    collectContextMode: CollectContextMode;
    clientVersion: string;
    abortTimeoutId: ReturnType<typeof setTimeout> | undefined;
    abortController: AbortController | undefined;
    constructor({ sdkKey, contexts, apiUrls, domain, timeout, collectContextMode, clientVersion, }: LoaderParams);
    url(apiUrl: string): string;
    load(): Promise<EvaluationPayload>;
    /**
     * Try each API URL in order. Return the first successful result.
     */
    private loadWithFailover;
    private fetchFromUrl;
    clearAbortTimeout(): void;
}