import { IRelationDescriptor, ISelectQueryBuilder, RelationType } from './interfaces.js';
import type { WhereBuilder } from './builders.js';
import { WhereFunction } from './types.js';
/**
 * Strategy that builds the EXISTS / NOT EXISTS clause for one relation type.
 *
 * Resolved via `Array.ofType(ExistsRelationHandler)` and dispatched by `rel.Type` from
 * `WhereBuilder.buildExistsClause`. Implementations either:
 *  - mutate the outer builder directly and return `undefined` (eg. {@link RelationType.One}
 *    adds `WHERE FK IS NOT NULL` plus a right-join, no EXISTS sub-query is generated), or
 *  - return a correlated sub-query that the caller wraps in EXISTS/NOT EXISTS.
 */
export declare abstract class ExistsRelationHandler {
    abstract get Type(): RelationType;
    abstract apply<R>(builder: WhereBuilder<any>, rel: IRelationDescriptor, relationName: string, callback?: WhereFunction<R>): ISelectQueryBuilder | undefined;
}
export declare class OneExistsRelationHandler extends ExistsRelationHandler {
    get Type(): RelationType;
    apply<R>(builder: WhereBuilder<any>, rel: IRelationDescriptor, _relationName: string, callback?: WhereFunction<R>): ISelectQueryBuilder | undefined;
}
export declare class ManyExistsRelationHandler extends ExistsRelationHandler {
    get Type(): RelationType;
    apply<R>(builder: WhereBuilder<any>, rel: IRelationDescriptor, _relationName: string, callback?: WhereFunction<R>): ISelectQueryBuilder;
}
export declare class ManyToManyExistsRelationHandler extends ExistsRelationHandler {
    get Type(): RelationType;
    apply<R>(builder: WhereBuilder<any>, rel: IRelationDescriptor, _relationName: string, callback?: WhereFunction<R>): ISelectQueryBuilder;
}
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