/// <reference types="node" />
import { Readable } from 'stream';
import { IDict } from './common';
export declare function importSchema(source?: string | File, schema?: IDict | File): Promise<{
    columns: IDict<any>[];
    metadata: {};
}>;
export declare function exportSchema(columns: IDict[], metadata: IDict): {
    fields: any[];
};
export declare function getFieldTypes(): string[];
export declare function getFieldFormats(type: string): string[];
export declare function createColumn(index: number, field?: IDict, values?: any[]): {
    id: string;
    field: {
        name: any;
        type: any;
        format: any;
    };
    values: any[];
};
export declare function prepareTableSource(source?: string | File): Promise<string | never[] | (() => Readable)>;
export declare function prepareTableOptions(schema?: IDict | File): Promise<{
    schema?: undefined;
} | {
    schema: any;
}>;
export declare function readFile(file: File): Promise<string>;