import { ValueRecord } from "../utils";
import { QueryConfig } from "./config";
import { SqlBuilder } from "./builder";
export { QueryConfig, SqlBuilder };
export declare type PgQueryConfig = QueryConfig;
/**
 * SQL template string tag. Returns a query object: `{ text: string, values: any[] }`.
 * Template expressions are automatically SQL-injection-proofed unless wrapped in `sql.raw()`.
 *
 * @example
 * const { rows } = await database.query(sql`SELECT name, email FROM users WHERE id=${userID}`)
 * @example
 * const { rows } = await database.query<{ name: string, email: string }>(sql`
 *   SELECT name, email FROM users WHERE id=${userID}
 * `)
 */
export declare function sql(texts: TemplateStringsArray, ...values: any[]): PgQueryConfig;
export declare namespace sql {
    var raw: typeof rawExpression;
    var safe: typeof safeExpression;
}
/**
 * Wrap an SQL template expression value in `sql.raw()` to inject the raw value into the query.
 * Attention: Can easily lead to SQL injections! Use with caution and only if necessary.
 */
declare function rawExpression(rawValue: string): SqlBuilder;
declare function safeExpression<T>(value: T): SqlBuilder<T>;
export { rawExpression as raw, safeExpression as safe };
/**
 * Convenience function to keep WHERE clauses concise. Takes an object:
 * Keys are supposed to be a column name, values the values that the record must have set.
 *
 * @example
 * const { rows } = await database.query(sql`SELECT * FROM users WHERE ${spreadAnd({ name: "John", email: "john@example.com" })}`)
 */
export declare function spreadAnd<T>(record: any): SqlBuilder<T>;
/**
 * Convenience function to keep INSERT statements concise.
 * @example
 * await database.query(sql`INSERT INTO users ${spreadInsert({ name: "John", email: "john@example.com" })}`)
 */
export declare function spreadInsert<T>(...records: ValueRecord[]): SqlBuilder<T>;
/**
 * Convenience function to keep UPDATE statements concise. Takes an object:
 * @example
 * await database.query(sql`UPDATE users SET ${spreadUpdate({ name: "John", email: "john@example.com" })} WHERE id = 1`)
 */
export declare function spreadUpdate(record: any): SqlBuilder;