import type { EmptyObj } from '../types';
import type * as SqlUtilsType from '../types/sql-utils';
import type { SqlTemplate, SqlTempParams } from '../types/pg-helper';
declare const symbolLiteral: unique symbol;
/**
 * sqlTemp to pg query params
 * ```
 * sqlTemp: `select * from ${USERS}  where username = {username}`
 * sqlParams: {username: 'xiaohong'}
 * to
 * sql: `select * from ${USERS}  where username = $1`
 * values: ['xiaohong']
 * ```
 * @param sqlTemp sql
 * @param sqlParams value
 */
declare function sqlTemplate(sqlTemp: SqlTemplate, sqlParams?: SqlTempParams): {
    sql: string;
    values: any[];
};
/**
 * build fields Sql
 */
declare function fieldsSql(params: string[]): string;
declare function objHump2underline(obj: EmptyObj): EmptyObj;
declare function rowsUnderline2hump(rows: EmptyObj[]): EmptyObj[];
/**
 * build order sql
 */
declare function orderSql(orders?: SqlUtilsType.Order[]): string;
/**
 * build where sql
 */
declare function whereSql(where?: SqlUtilsType.Where): string;
/**
 * build limit offset sql
 */
declare function limitOffsetSql(params: SqlUtilsType.LimitOffset): string;
/**
 * build include Sql
 */
declare function includeSql(params?: SqlUtilsType.Include[]): string;
/**
 * build update sql
 */
declare function updateSql(params?: SqlUtilsType.Update): string;
/**
 * build insert sql
 */
declare function insertSql(params: SqlUtilsType.Insert): {
    sql: string;
    data: any[];
};
/**
 * build returning sql
 */
declare function returningSql(returning?: SqlUtilsType.Returning): string;
/**
 * Functions used internally to build sql,  It is useful to construct some special SQL, the returned sql will not be used as a template for the key
 */
declare function literalSql(sql: string): {
    [symbolLiteral]: string;
};
export { sqlTemplate, fieldsSql, rowsUnderline2hump, objHump2underline, orderSql, whereSql, limitOffsetSql, includeSql, updateSql, insertSql, returningSql, literalSql };