import { z } from 'zod';
export declare const DocumentSchema: z.ZodObject<{
    _id: z.ZodString;
    created_at: z.ZodOptional<z.ZodNullable<z.ZodBranded<z.ZodEffects<z.ZodNumber, import("./unix-timestamp.js").UnixTimestamp, number>, "UnixTimestamp">>>;
    updated_at: z.ZodOptional<z.ZodNullable<z.ZodBranded<z.ZodEffects<z.ZodNumber, import("./unix-timestamp.js").UnixTimestamp, number>, "UnixTimestamp">>>;
}, "strip", z.ZodTypeAny, {
    _id: string;
    created_at?: (number & {
        __brand: "UnixTimestamp";
    } & z.BRAND<"UnixTimestamp">) | null | undefined;
    updated_at?: (number & {
        __brand: "UnixTimestamp";
    } & z.BRAND<"UnixTimestamp">) | null | undefined;
}, {
    _id: string;
    created_at?: number | null | undefined;
    updated_at?: number | null | undefined;
}>;