import { EntityMetadata, ObjectLiteral, Repository, SelectQueryBuilder } from 'typeorm';
import { AggregateSpec } from '../types';
export declare class QueryBuilderHelper<T extends ObjectLiteral> {
    readonly repository: Repository<T>;
    readonly builder: SelectQueryBuilder<T>;
    selectedFields: Set<string>;
    readonly dbType: string;
    readonly rootAlias: string;
    readonly entityColumns: string[];
    readonly entityPrimaryColumns: string[];
    readonly entityColumnsHash: ObjectLiteral;
    readonly entityHasDeleteColumn: boolean;
    readonly hiddenRootFields: Set<string>;
    protected readonly entityRelationsHash: Map<string, any>;
    constructor(repository: Repository<T>, builder: SelectQueryBuilder<T>);
    private initializeEntityColumns;
    private initializePrimaryColumns;
    private initializeDeleteColumn;
    getIdentifierQuote(): string;
    cleanFieldName(fieldName: string): string;
    getFieldWithAlias(field: string, useDbField?: boolean): string;
    getRelationMetadata(field: string): any;
    isAllowedField(field: string): boolean;
    isHiddenField(field: string): boolean;
    get visibleColumns(): string[];
    visibleRelationColumns(relationPath: string, columns: string[]): string[];
    relationHiddenFields(relationPath: string): Set<string>;
    isAllowedAggregateField(field: string): boolean;
    correlation(relationPath: string): {
        table: string;
        alias: string;
        condition: string;
    };
    compileAggregate(spec: AggregateSpec): {
        as: string;
        sql: string;
        numeric: boolean;
        alias: string;
        relationPath: string;
    };
    private isNumericAggregate;
    getEntityColumns(entityMetadata: EntityMetadata): {
        columns: string[];
        primaryColumns: string[];
    };
}
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