/**
 * ER Diagram AST Types
 *
 * Represents Entity-Relationship diagrams with entities, attributes, and relationships.
 */
/**
 * Cardinality types for relationships
 */
export type ErCardinality = 'ZERO_OR_ONE' | 'ZERO_OR_MORE' | 'ONE_OR_MORE' | 'ONLY_ONE' | 'MD_PARENT';
/**
 * Identification types for relationships
 */
export type ErIdentification = 'IDENTIFYING' | 'NON_IDENTIFYING';
/**
 * Diagram direction
 */
export type ErDirection = 'TB' | 'BT' | 'LR' | 'RL';
/**
 * Attribute key types (Primary Key, Foreign Key, Unique Key)
 */
export type ErAttributeKey = 'PK' | 'FK' | 'UK';
/**
 * An attribute of an entity
 */
export interface ErAttribute {
    /** Attribute data type */
    type: string;
    /** Attribute name */
    name: string;
    /** Optional key constraints */
    keys?: ErAttributeKey[];
    /** Optional comment/description */
    comment?: string;
}
/**
 * An entity in the ER diagram
 */
export interface ErEntity {
    /** Entity name */
    name: string;
    /** Optional alias for display */
    alias?: string;
    /** Entity attributes */
    attributes: ErAttribute[];
}
/**
 * Relationship specification (cardinality on both sides)
 */
export interface ErRelSpec {
    /** Cardinality on the first entity's side */
    cardA: ErCardinality;
    /** Relationship type (identifying or non-identifying) */
    relType: ErIdentification;
    /** Cardinality on the second entity's side */
    cardB: ErCardinality;
}
/**
 * A relationship between two entities
 */
export interface ErRelationship {
    /** First entity name */
    entityA: string;
    /** Second entity name */
    entityB: string;
    /** Relationship specification */
    relSpec: ErRelSpec;
    /** Role/label for the relationship */
    role: string;
}
/**
 * Class definition for styling
 */
export interface ErClassDef {
    /** Class name */
    name: string;
    /** CSS styles */
    styles: string[];
}
/**
 * The complete ER Diagram AST
 */
export interface ErDiagramAST {
    type: 'erDiagram';
    /** Diagram direction */
    direction: ErDirection;
    /** All entities */
    entities: Map<string, ErEntity>;
    /** All relationships */
    relationships: ErRelationship[];
    /** Class definitions */
    classDefs: Map<string, ErClassDef>;
    /** Class assignments (entity name -> class names) */
    classes: Map<string, string[]>;
    /** CSS style assignments (entity name -> styles) */
    styles: Map<string, string[]>;
    /** Accessibility title */
    accTitle?: string;
    /** Accessibility description */
    accDescription?: string;
}
/**
 * Create an empty ER Diagram AST
 */
export declare function createEmptyErDiagramAST(): ErDiagramAST;
//# sourceMappingURL=er.d.ts.map