import { RegistrableModel } from './registrable.js';
export interface NonVerbalReferenceJson {
    entityId?: string | null;
    entity_id?: string | null;
    ref?: string | null;
    id?: string | null;
    display?: string | null;
    type?: string;
}
/**
 * Polymorphic JSON for NonVerbalReference: either a bare string (the
 * entity id) or an object with `{ ref, display?, type? }`.
 */
export type NonVerbalReferenceInput = NonVerbalReferenceJson | string | NonVerbalReference;
export declare class NonVerbalReference extends RegistrableModel {
    readonly entityId: string | null;
    readonly display: string | null;
    constructor(data?: NonVerbalReferenceJson);
    get dedupKey(): [string, string | null];
    toJSON(): NonVerbalReferenceJson | string;
    static fromJSON<T extends NonVerbalReference>(this: new (...args: any[]) => T, data: NonVerbalReferenceInput): T | NonVerbalReference;
}
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