export declare class ObjectId {
    private id;
    _id: this;
    readonly _bsontype: "ObjectId";
    constructor(id?: string | number | ObjectId);
    static generate(): string;
    /**
     * Creates an ObjectId from a Unix timestamp (seconds since epoch).
     * The remaining bytes are set to zero.
     */
    static createFromTime(time: number): ObjectId;
    /**
     * Creates an ObjectId from a 24-character hex string.
     * Explicit factory method matching mongoose API.
     */
    static createFromHexString(hexString: string): ObjectId;
    toString(): string;
    /**
     * Returns the ObjectId as a 24-character hex string.
     * Alias for toString() - matches mongoose/bson API.
     */
    toHexString(): string;
    toJSON(): string;
    equals(other: ObjectId | string | null | undefined): boolean;
    getTimestamp(): Date;
    static isValid(id: unknown): boolean;
}
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