/**
 * Result of the database query.
 */
interface QueryResponse {
    /**
     * Column definitions.
     */
    columns: Column[];
    /**
     * Array of rows, where each row is an array of values with their indices
     * corresponding to the indices of the column definitions.
     */
    rows: unknown[][];
}
/**
 * Column definition.
 */
interface Column {
    /**
     * Name of the column.
     */
    name: string;
    /**
     * Object identifier of the column type.
     *
     * If you need to know the column type name, you can use the `oid` to query
     * the `pg_type` catalog:
     *
     * ```ts
     * await client.query(
     *   `SELECT typname FROM pg_type WHERE oid = $1`,
     *   [column.oid]
     * );
     * ```
     */
    oid: number;
}
interface Queryable {
    query(query: string, parameters: unknown[]): Promise<QueryResponse>;
}

/**
 * Template literal tag function that executes the query.
 *
 * ```ts
 * const [user] = await sql<User>`SELECT * FROM users WHERE id = ${id}`;
 * ```
 */
interface Sql {
    <Record = unknown>(strings: TemplateStringsArray, ...values: unknown[]): Promise<Record[]>;
    /**
     * Executes a raw query defined as a string with placeholders and the list
     * of parameters.
     *
     * ```ts
     * const [user] = await sql.query<User>("SELECT * FROM users WHERE id = $1", [id]);
     * ```
     */
    query<Record>(query: string, params: unknown[]): Promise<Record[]>;
}
type Deserialize = (value: unknown, oid: unknown) => unknown;

/**
 * Client configuration options.
 */
interface ClientOptions {
    /**
     * Prisma Postgres URL.
     */
    connectionString: string;
}
/**
 * Generic error that occurred when sending the request or executing a query.
 */
declare class RequestError extends Error {
    constructor(message: string, httpCode?: number);
}
interface PostgresError {
    error: string;
    severity_local: string;
    severity: string;
    code: string;
    position?: string;
    file: string;
    line: string;
    routine: string;
}
/**
 * Error in the database query.
 */
declare class SqlError extends RequestError {
    error: string;
    severityLocal: string;
    severity: string;
    code: string;
    position?: string;
    file: string;
    line: string;
    routine: string;
    constructor(pgError: PostgresError);
}
/**
 * Low level HTTP client interface.
 *
 * ```ts
 * const client = new Client({
 *   connectionString: "prisma+postgres://accelerate.prisma-data.net/?api_key=..."
 * });
 *
 * const { columns, rows } = await client.query(`SELECT * FROM "users" WHERE id = $1`, [1]);
 * ```
 */
declare class Client implements Queryable {
    #private;
    constructor(options: ClientOptions);
    /**
     * Executes a query against the Prisma Postgres database.
     */
    query(query: string, parameters: unknown[]): Promise<QueryResponse>;
}

declare class ConnectionStringError extends Error {
    constructor(message: string);
}

/**
 * Connects to the specified Prisma Postgres database and returns a high-level
 * SQL client provided as a template literal tag function.
 *
 * ```ts
 * const sql = ppg("prisma+postgres://accelerate.prisma-data.net/?api_key=...");
 * const posts: Post[] = await sql`SELECT * FROM posts WHERE user_id = ${userId}`;
 * ```
 *
 * The interpolated values are automatically converted to SQL parameters to
 * prevent SQL injection attacks.
 *
 * You can also pass a custom deserializer function to convert the values based
 * on the column type.
 *
 * See also {@link Client} for the low-level client API.
 */
declare function ppg(url: string, deserialize?: Deserialize): Sql;

export { Client, type ClientOptions, type Column, ConnectionStringError, type Deserialize, type QueryResponse, RequestError, type Sql, SqlError, ppg as default, ppg };