import "@effect-ts/system/Operator";
import type { DataSource } from "../DataSource/index.js";
/**
 * A `DataSourceAspect` is an aspect that can be weaved into queries. You can
 * think of an aspect as a polymorphic function, capable of transforming one
 * data source into another, possibly enlarging the environment type.
 */
export interface DataSourceAspect<R> {
    <R1, A>(dataSource: DataSource<R1, A>): DataSource<R1 & R, A>;
}
/**
 * Returns a new aspect that represents the sequential composition of this
 * aspect with the specified one.
 */
export declare function andThen_<R1, R2>(fa: DataSourceAspect<R1>, fb: DataSourceAspect<R2>): DataSourceAspect<R1 & R2>;
/**
 * Returns a new aspect that represents the sequential composition of this
 * aspect with the specified one.
 * @ets_data_first andThen_
 */
export declare function andThen<R2>(fb: DataSourceAspect<R2>): <R1>(fa: DataSourceAspect<R1>) => DataSourceAspect<R1 & R2>;
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