import type { SlackResult } from "./slack-api.js";
export declare const DEFAULT_SLACK_FILE_CACHE_TTL_MS: number;
export declare const DEFAULT_SLACK_FILE_MAX_DOWNLOAD_BYTES: number;
export interface SlackFileDescriptor {
    fileId: string;
    path: string;
    filename: string;
    mimetype?: string;
    filetype?: string;
    prettyType?: string;
    size: number;
    sha256: string;
    cacheDir: string;
    expiresAt: string;
    residualRisks: string[];
}
export interface SlackFileLookupContext {
    channelId?: string;
    threadTs?: string;
    messageTs?: string;
}
export interface SlackFileDownloadDeps {
    slack: (method: string, token: string, body?: Record<string, unknown>) => Promise<SlackResult>;
    token: string;
    fetchImpl?: (url: string, init: RequestInit) => Promise<Pick<Response, "ok" | "status" | "statusText" | "arrayBuffer" | "text"> & {
        body?: Response["body"];
    }>;
    now?: () => Date;
    cacheDir?: string;
    ttlMs?: number;
    maxBytes?: number;
}
export declare function fetchSlackFileToCache(fileId: string, context: SlackFileLookupContext, deps: SlackFileDownloadDeps): Promise<SlackFileDescriptor>;
export declare function readCachedSlackFile(pathname: string): Promise<Buffer>;