export interface SlackResponse {
    ok: boolean;
    error?: string;
    needed?: string;
    provided?: string;
    [key: string]: unknown;
}
export declare class SlackApiError extends Error {
    readonly endpoint: string;
    readonly slackError: string;
    readonly needed: string | null;
    readonly provided: string | null;
    constructor(endpoint: string, slackError: string, needed?: string | null, provided?: string | null);
}
export interface SlackTransport {
    call(endpoint: string, params?: Record<string, string>, body?: unknown): Promise<SlackResponse>;
    downloadFile?(url: string, offset?: number, size?: number | null): Promise<Uint8Array>;
    searchAvailable?(): boolean;
}
export declare abstract class HttpSlackTransport implements SlackTransport {
    protected readonly fetch: typeof fetch;
    protected abstract baseUrl(): string;
    protected abstract authHeaders(endpoint?: string): Promise<Record<string, string>> | Record<string, string>;
    call(endpoint: string, params?: Record<string, string>, body?: unknown): Promise<SlackResponse>;
    downloadFile(url: string, offset?: number, size?: number | null): Promise<Uint8Array>;
}
export declare class NodeSlackTransport extends HttpSlackTransport {
    private readonly token;
    private readonly searchToken?;
    private readonly baseUrlOverride?;
    constructor(token: string, searchToken?: string | undefined, baseUrlOverride?: string | undefined);
    protected baseUrl(): string;
    protected authHeaders(endpoint?: string): Record<string, string>;
    searchAvailable(): boolean;
}
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