import { Queryable } from '@databases/pg';
import { ClassQuery } from './getClasses';
import ConstraintType from './enums/ConstraintType';
import ForeignKeyAction from './enums/ForeginKeyAction';
import ForeignKeyMatchType from './enums/ForeignKeyMatchType';
export interface ConstraintQuery extends ClassQuery {
}
export interface Constraint {
    /**
     * N.B. the name of the constraint is not necessarily unique
     */
    constraintName: string;
    constraintType: ConstraintType;
    /**
     * 0 if not a table constraint
     */
    classID: number;
    /**
     * 0 if not a foreign key
     */
    referencedClassID: number;
    foreignKeyUpdateAction: ForeignKeyAction;
    foreignKeyDeletionAction: ForeignKeyAction;
    foreignKeyMatchType: ForeignKeyMatchType;
    constraintDescription: string;
    tableAttributeNumbers: number[];
    referencedAttributeNumbers: number[];
}
export default function getConstraints(connection: Queryable, query: ConstraintQuery): Promise<Constraint[]>;