import { AsyncLocalStorage } from 'async_hooks';
import { PgSqlClient } from '.';
/**
 * AsyncLocalStorage used to determine if the current async context is running inside a SQL
 * transaction.
 */
export declare const sqlTransactionContext: AsyncLocalStorage<SqlTransactionContext>;
type SqlTransactionContext = {
    [dbName: string]: PgSqlClient;
};
type UnwrapPromiseArray<T> = T extends any[] ? {
    [k in keyof T]: T[k] extends Promise<infer R> ? R : T[k];
} : T;
/**
 * Base class that provides access to a SQL client and SQL transaction management.
 */
export declare abstract class BasePgStore {
    /**
     * Getter for a SQL client. If used inside `sqlTransaction`, the scoped client within the current
     * async context will be returned to guarantee transaction consistency.
     */
    get sql(): PgSqlClient;
    /** The raw SQL client instance. */
    readonly _sql: PgSqlClient;
    constructor(sql: PgSqlClient);
    close(args?: {
        timeout?: number;
    }): Promise<void>;
    /**
     * Start a SQL transaction. If any SQL client used within the callback was already scoped inside a
     * `BEGIN` transaction, no new transaction will be opened. This flexibility allows us to avoid
     * repeating code while making sure we don't arrive at SQL errors such as
     * `WARNING: there is already a transaction in progress` which may cause result inconsistencies.
     * @param callback - Callback with a scoped SQL client
     * @param readOnly - If a `BEGIN` transaction should be marked as `READ ONLY`
     * @returns Transaction results
     */
    sqlTransaction<T>(callback: (sql: PgSqlClient) => T | Promise<T>, readOnly?: boolean): Promise<UnwrapPromiseArray<T>>;
    /**
     * Start a SQL write transaction. See `sqlTransaction`.
     * @param callback - Callback with a scoped SQL client
     * @returns Transaction results
     */
    sqlWriteTransaction<T>(callback: (sql: PgSqlClient) => T | Promise<T>): Promise<UnwrapPromiseArray<T>>;
    /**
     * Refreshes a materialized view concurrently depending on the current environment.
     * @param viewName - Materialized view name
     */
    refreshMaterializedView(viewName: string): Promise<void>;
    /**
     * Checks if the database connection is alive.
     * @returns True if connected, false otherwise.
     */
    isConnected(): Promise<boolean>;
}
/**
 * Base module that extends PgStore functionality and allows organizing queries in separate files.
 */
export declare abstract class BasePgStoreModule {
    private readonly parent;
    constructor(db: BasePgStore);
    protected get sql(): PgSqlClient;
    sqlTransaction<T>(callback: (sql: PgSqlClient) => T | Promise<T>, readOnly?: boolean): Promise<UnwrapPromiseArray<T>>;
    sqlWriteTransaction<T>(callback: (sql: PgSqlClient) => T | Promise<T>): Promise<UnwrapPromiseArray<T>>;
    refreshMaterializedView(viewName: string): Promise<void>;
    isConnected(): Promise<boolean>;
}
export {};