import { GlossaristModel } from './base.js';
export type ConceptDateType = 'accepted' | 'amended' | 'retired' | string;
export declare const DATE_TYPES: ReadonlyArray<string>;
export interface ConceptDateJson {
    date?: string | null;
    type?: ConceptDateType | null;
}
export declare class ConceptDate extends GlossaristModel {
    readonly date: string | null;
    readonly type: ConceptDateType | null;
    constructor(data?: ConceptDateJson);
    get parsedDate(): Date | null;
    static identityOf(value: {
        type?: ConceptDateType | null;
    } | null | undefined): string;
    identity(): string;
    toJSON(): ConceptDateJson;
    static fromJSON(data: ConceptDateJson): ConceptDate;
}
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