import type { Expression } from '../expression/expression.js';
import type { SelectQueryBuilderExpression } from '../query-builder/select-query-builder-expression.js';
import type { RawBuilder } from '../raw-builder/raw-builder.js';
import type { ShallowDehydrateObject, ShallowDehydrateValue, Simplify } from '../util/type-utils.js';
/**
 * A SQLite helper for aggregating a subquery into a JSON array.
 *
 * NOTE: This helper only works correctly if you've installed the `ParseJSONResultsPlugin`.
 * Otherwise the nested selections will be returned as JSON strings.
 *
 * The plugin can be installed like this:
 *
 * ```ts
 * import * as Sqlite from 'better-sqlite3'
 * import { Kysely, ParseJSONResultsPlugin, SqliteDialect } from 'kysely'
 * import type { Database } from 'type-editor' // imaginary module
 *
 * const db = new Kysely<Database>({
 *   dialect: new SqliteDialect({
 *     database: new Sqlite(':memory:')
 *   }),
 *   plugins: [new ParseJSONResultsPlugin()]
 * })
 * ```
 *
 * ### Examples
 *
 * ```ts
 * import { jsonArrayFrom } from 'kysely/helpers/sqlite'
 *
 * const result = await db
 *   .selectFrom('person')
 *   .select((eb) => [
 *     'id',
 *     jsonArrayFrom(
 *       eb.selectFrom('pet')
 *         .select(['pet.id as pet_id', 'pet.name'])
 *         .whereRef('pet.owner_id', '=', 'person.id')
 *         .orderBy('pet.name')
 *     ).as('pets')
 *   ])
 *   .execute()
 *
 * result[0]?.id
 * result[0]?.pets[0].pet_id
 * result[0]?.pets[0].name
 * ```
 *
 * The generated SQL (SQLite):
 *
 * ```sql
 * select "id", (
 *   select coalesce(json_group_array(json_object(
 *     'pet_id', "agg"."pet_id",
 *     'name', "agg"."name"
 *   )), '[]') from (
 *     select "pet"."id" as "pet_id", "pet"."name"
 *     from "pet"
 *     where "pet"."owner_id" = "person"."id"
 *     order by "pet"."name"
 *   ) as "agg"
 * ) as "pets"
 * from "person"
 * ```
 */
export declare function jsonArrayFrom<O>(expr: SelectQueryBuilderExpression<O>): RawBuilder<Simplify<ShallowDehydrateObject<O>>[]>;
/**
 * A SQLite helper for turning a subquery into a JSON object.
 *
 * The subquery must only return one row.
 *
 * NOTE: This helper only works correctly if you've installed the `ParseJSONResultsPlugin`.
 * Otherwise the nested selections will be returned as JSON strings.
 *
 * The plugin can be installed like this:
 *
 * ```ts
 * import * as Sqlite from 'better-sqlite3'
 * import { Kysely, ParseJSONResultsPlugin, SqliteDialect } from 'kysely'
 * import type { Database } from 'type-editor' // imaginary module
 *
 * const db = new Kysely<Database>({
 *   dialect: new SqliteDialect({
 *     database: new Sqlite(':memory:')
 *   }),
 *   plugins: [new ParseJSONResultsPlugin()]
 * })
 * ```
 *
 * ### Examples
 *
 * ```ts
 * import { jsonObjectFrom } from 'kysely/helpers/sqlite'
 *
 * const result = await db
 *   .selectFrom('person')
 *   .select((eb) => [
 *     'id',
 *     jsonObjectFrom(
 *       eb.selectFrom('pet')
 *         .select(['pet.id as pet_id', 'pet.name'])
 *         .whereRef('pet.owner_id', '=', 'person.id')
 *         .where('pet.is_favorite', '=', true)
 *     ).as('favorite_pet')
 *   ])
 *   .execute()
 *
 * result[0]?.id
 * result[0]?.favorite_pet?.pet_id
 * result[0]?.favorite_pet?.name
 * ```
 *
 * The generated SQL (SQLite):
 *
 * ```sql
 * select "id", (
 *   select json_object(
 *     'pet_id', "obj"."pet_id",
 *     'name', "obj"."name"
 *   ) from (
 *     select "pet"."id" as "pet_id", "pet"."name"
 *     from "pet"
 *     where "pet"."owner_id" = "person"."id"
 *     and "pet"."is_favorite" = ?
 *   ) as obj
 * ) as "favorite_pet"
 * from "person";
 * ```
 */
export declare function jsonObjectFrom<O>(expr: SelectQueryBuilderExpression<O>): RawBuilder<Simplify<ShallowDehydrateObject<O>> | null>;
/**
 * The SQLite `json_object` function.
 *
 * NOTE: This helper only works correctly if you've installed the `ParseJSONResultsPlugin`.
 * Otherwise the nested selections will be returned as JSON strings.
 *
 * The plugin can be installed like this:
 *
 * ```ts
 * import * as Sqlite from 'better-sqlite3'
 * import { Kysely, ParseJSONResultsPlugin, SqliteDialect } from 'kysely'
 * import type { Database } from 'type-editor' // imaginary module
 *
 * const db = new Kysely<Database>({
 *   dialect: new SqliteDialect({
 *     database: new Sqlite(':memory:')
 *   }),
 *   plugins: [new ParseJSONResultsPlugin()]
 * })
 * ```
 *
 * ### Examples
 *
 * ```ts
 * import { sql } from 'kysely'
 * import { jsonBuildObject } from 'kysely/helpers/sqlite'
 *
 * const result = await db
 *   .selectFrom('person')
 *   .select((eb) => [
 *     'id',
 *     jsonBuildObject({
 *       first: eb.ref('first_name'),
 *       last: eb.ref('last_name'),
 *       full: sql<string>`first_name || ' ' || last_name`
 *     }).as('name')
 *   ])
 *   .execute()
 *
 * result[0]?.id
 * result[0]?.name.first
 * result[0]?.name.last
 * result[0]?.name.full
 * ```
 *
 * The generated SQL (SQLite):
 *
 * ```sql
 * select "id", json_object(
 *   'first', first_name,
 *   'last', last_name,
 *   'full', "first_name" || ' ' || "last_name"
 * ) as "name"
 * from "person"
 * ```
 */
export declare function jsonBuildObject<O extends Record<string, Expression<unknown>>>(obj: O): RawBuilder<Simplify<{
    [K in keyof O]: O[K] extends Expression<infer V> ? ShallowDehydrateValue<V> : never;
}>>;
