import { Stream } from "effect";
/**
 * A select configuration can be either:
 * - Object-based: `{ name: true, email: true, company: { name: true } }`
 * - Array-based: `["name", "email"]` (picks those fields)
 */
type SelectConfig = Record<string, unknown> | ReadonlyArray<string>;
/**
 * Apply a field selection as a Stream combinator.
 * Returns a function that transforms Stream<T> → Stream<T>, projecting each entity
 * to only the selected fields.
 *
 * Supports both object-based (`{ name: true, email: true }`) and
 * array-based (`["name", "email"]`) selection configs.
 * Nested selection on populated relationships is supported via object-based config:
 * `{ name: true, company: { name: true } }`.
 */
export declare const applySelect: <T extends Record<string, unknown>>(select: SelectConfig | undefined) => <E, R>(stream: Stream.Stream<T, E, R>) => Stream.Stream<T, E, R>;
/**
 * Apply a field selection to an array of items.
 *
 * This is used by cursor pagination where items are collected before selection.
 * Supports both object-based and array-based selection configs.
 */
export declare const applySelectToArray: <T extends Record<string, unknown>>(items: ReadonlyArray<T>, select: SelectConfig | undefined) => ReadonlyArray<T>;
export {};
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