import type { FilesCompleteUploadExternalResponse, FilesGetUploadURLExternalResponse, FilesInfoResponse } from '@slack/web-api';
export type SlackFileInfo = NonNullable<FilesInfoResponse['file']>;
export interface SlackFileClient {
    files: {
        completeUploadExternal(input: {
            channel_id?: string;
            files: Array<{
                id: string;
                title?: string;
            }>;
            initial_comment?: string;
            thread_ts?: string;
        }): Promise<FilesCompleteUploadExternalResponse>;
        getUploadURLExternal(input: {
            filename: string;
            length: number;
        }): Promise<FilesGetUploadURLExternalResponse>;
        info(input: {
            file: string;
        }): Promise<FilesInfoResponse>;
    };
}
export interface UploadedSlackFile {
    fileId: string;
    filename: string;
    localPath: string;
    mimetype: string;
    sizeBytes: number;
}
export declare function uploadSlackFile(input: {
    client: SlackFileClient;
    fetchImpl?: typeof fetch;
    localPath: string;
}): Promise<UploadedSlackFile>;
export interface CompletedSlackUploadFile {
    fileId: string;
    title?: string;
}
export declare function completeSlackFileUpload(input: {
    caption?: string;
    channelId: string;
    client: SlackFileClient;
    files: Array<{
        fileId: string;
        title?: string;
    }>;
    threadTs?: string;
}): Promise<CompletedSlackUploadFile[]>;
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