/// <reference types="websql" />
import type { Resolvable } from '../sbvr-api/common-types';
import { Engines } from '@resin/abstract-sql-compiler';
import * as Bluebird from 'bluebird';
import * as EventEmitter from 'eventemitter3';
import { TypedError } from 'typed-error';
export declare const metrics: EventEmitter<string | symbol, any>;
export interface CodedError extends Error {
    code: number | string;
}
export interface Row {
    [fieldName: string]: any;
}
export interface Result {
    rows: Row[];
    rowsAffected: number;
    insertId?: number;
}
export declare type Sql = string;
export declare type Bindings = any[];
export declare class DatabaseError extends TypedError {
    code: number | string;
    constructor(message?: string | CodedError | SQLError);
}
export declare class ConstraintError extends DatabaseError {
}
export declare class UniqueConstraintError extends ConstraintError {
}
export declare class ForeignKeyConstraintError extends ConstraintError {
}
interface TransactionFn {
    <T>(fn: (tx: Tx) => Resolvable<T>): Bluebird<T>;
    (): Bluebird<Tx>;
}
export interface Database {
    DatabaseError: typeof DatabaseError;
    ConstraintError: typeof ConstraintError;
    UniqueConstraintError: typeof UniqueConstraintError;
    ForeignKeyConstraintError: typeof ForeignKeyConstraintError;
    engine: Engines;
    executeSql: (this: Database, sql: Sql, bindings?: Bindings) => Bluebird<Result>;
    transaction: TransactionFn;
    readTransaction?: TransactionFn;
}
export declare const engines: {
    [engine: string]: (connectString: string | object) => Database;
};
export declare abstract class Tx {
    private automaticCloseTimeout;
    private automaticClose;
    constructor(stackTraceErr?: Error);
    private pending;
    private incrementPending;
    private decrementPending;
    cancelPending(): void;
    private closeTransaction;
    executeSql(sql: Sql, bindings?: Bindings, ...args: any[]): Bluebird<Result>;
    rollback(): Bluebird<void>;
    end(): Bluebird<void>;
    private listeners;
    on(name: keyof Tx['listeners'], fn: () => void): void;
    private clearListeners;
    protected abstract _executeSql(sql: Sql, bindings: Bindings, addReturning?: false | string): Bluebird<Result>;
    protected abstract _rollback(): Bluebird<void>;
    protected abstract _commit(): Bluebird<void>;
    abstract tableList(extraWhereClause?: string): Bluebird<Result>;
    dropTable(tableName: string, ifExists?: boolean): Bluebird<Result>;
}
export declare const connect: (databaseOptions: {
    engine: string;
    params: {};
}) => Database;
export {};