import { ConditionOptions } from '../conditionals/types';
export declare type SelectColumns = String | Array<string | SelectObject> | SelectObject;
export interface SelectObject {
    [index: number]: never;
    /**
     * Key is the alias. If value type is String will escape the names with \`\`. Name escaping will be ignored if passing an object with expression key containing the query expression.
     */
    [key: string]: string | Record<string, any> | undefined;
}
interface ColumnAliasObject {
    [key: string]: string | ConditionOptions;
}
export declare const isColumnAliasObject: (val: any) => val is ColumnAliasObject;
export {};