import { ErrorUnion, TextUnion } from '../outputs';
/**
 * Returns the extension of a file, guessed by its MIME type. Returns an empty string
 * on failure. This is an offline method. Can be called before authorization. Can be
 * called synchronously
 * @param {Object} params
 * @param {string} [params.mimeType] - The MIME type of the file
 * @param {Object} state
 * @returns {TextUnion | ErrorUnion}
 */
export declare type GetFileExtensionMethod = <ResponseT = TextUnion>(params: GetFileExtensionParams, state?: Record<string, any>) => Promise<ResponseT | ErrorUnion>;
export interface GetFileExtensionParams {
    /** The MIME type of the file */
    mimeType?: string;
}