export interface UploadConfig {
    apiKey: "free" | string;
    debug?: boolean;
    internal?: UploadInternalConfig;
}
/**
 * Undocumented (and unsupported) config for internal use only.
 */
export declare type UploadInternalConfig = ({
    authenticateWithApiKey?: true;
} | {
    accountId: string;
    authenticateWithApiKey: false;
    headers: () => Promise<Record<string, string>>;
}) & UploadInternalConfigBase;
export interface UploadInternalConfigBase {
    apiUrl?: string;
    cdnUrl?: string;
    headers?: () => Promise<Record<string, string>>;
}