import type { Dictionary, EntityMetadata, EntityName, EntityProperty, FilterDef, FilterQuery } from '../typings.js';
import { type QueryOrderMap } from '../enums.js';
import type { Platform } from '../platforms/Platform.js';
import type { MetadataStorage } from '../metadata/MetadataStorage.js';
import type { FilterOptions } from '../drivers/IDatabaseDriver.js';
/** @internal */
export declare class QueryHelper {
    static readonly SUPPORTED_OPERATORS: string[];
    /**
     * True when the property has multiple polymorph target types. Covers two structurally-equivalent
     * shapes routed through the same loading path:
     *   1. Union-target owner side — `Post.attachments: Collection<Image | Video>` (one owner, many
     *      target types, shared pivot with target-side discriminator).
     *   2. Merged inverse of Rails-style polymorphic M:N — `Tag.owners: Collection<Post | Video>`
     *      (many owner types pointing at one target, viewed from the target where "owners" looks
     *      like a union of multiple types).
     *
     * Both cases are loaded via `loadFromUnionTargetPolymorphicPivotTable`, which buckets pivot rows
     * by discriminator and hydrates each target class separately.
     */
    static isUnionTargetPolymorphic(prop: {
        polymorphic?: boolean;
        polymorphTargets?: readonly unknown[];
    }): boolean;
    /**
     * Finds the discriminator value (key) for a given entity class in a discriminator map.
     * Walks up the prototype chain so TPT subclasses resolve to their root's key.
     */
    static findDiscriminatorValue<T>(discriminatorMap: Dictionary<T>, targetClass: T): string | undefined;
    static processParams(params: unknown): any;
    static processObjectParams<T extends Dictionary>(params?: T): T;
    /**
     * converts `{ account: { $or: [ [Object], [Object] ] } }`
     * to `{ $or: [ { account: [Object] }, { account: [Object] } ] }`
     */
    static liftGroupOperators<T extends object>(where: Dictionary, meta: EntityMetadata<T>, metadata: MetadataStorage, key?: string): string | undefined;
    static inlinePrimaryKeyObjects<T extends object>(where: Dictionary, meta: EntityMetadata<T>, metadata: MetadataStorage, key?: string): boolean;
    static processWhere<T extends object>(options: ProcessWhereOptions<T>): FilterQuery<T>;
    static getActiveFilters<T>(meta: EntityMetadata<T>, options: FilterOptions | undefined, filters: Dictionary<FilterDef>): FilterDef[];
    static mergePropertyFilters(propFilters: FilterOptions | undefined, options: FilterOptions | undefined): FilterOptions | undefined;
    static isFilterActive<T>(meta: EntityMetadata<T>, filterName: string, filter: FilterDef, options: Dictionary<boolean | Dictionary>): boolean;
    static processCustomType<T extends object>(prop: EntityProperty<T>, cond: FilterQuery<T>, platform: Platform, key?: string, fromQuery?: boolean): FilterQuery<T>;
    private static isSupportedOperator;
    private static processJsonCondition;
    static findProperty<T>(fieldName: string, options: ProcessWhereOptions<T>): EntityProperty<T> | undefined;
    /**
     * Converts entity references for composite FK properties into flat arrays
     * of correctly-ordered join column values, before processParams flattens them
     * incorrectly due to shared FK columns.
     */
    private static convertCompositeEntityRefs;
    /**
     * Extracts values for a FK's join columns from an entity by traversing the FK chain.
     * Handles shared FK columns (e.g., tenant_id referenced by multiple FKs) correctly.
     */
    private static extractJoinColumnValues;
    /**
     * Expands a polymorphic entity reference to `[discriminatorValue, ...joinColumnValues]`,
     * matching the column order of `prop.fieldNames`.
     */
    private static extractPolymorphicJoinColumnValues;
    /**
     * Extracts the value for a specific column from an entity by finding which PK property
     * owns that column and recursively traversing FK references.
     */
    private static extractColumnValue;
    /**
     * Merges multiple orderBy sources with key-level deduplication (first-seen key wins).
     * RawQueryFragment symbol keys are never deduped (each is unique).
     */
    static mergeOrderBy<T>(...sources: (QueryOrderMap<T> | QueryOrderMap<T>[] | undefined)[]): QueryOrderMap<T>[];
}
interface ProcessWhereOptions<T> {
    where: FilterQuery<T>;
    entityName: EntityName<T>;
    metadata: MetadataStorage;
    platform: Platform;
    aliased?: boolean;
    aliasMap?: Dictionary<EntityName>;
    convertCustomTypes?: boolean;
    root?: boolean;
    type?: 'where' | 'orderBy';
}
export {};