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declare module 'mongoose' {
  /**   * Reference another Model   */   type PopulatedDoc<     PopulatedType,     RawId extends RefType = (PopulatedType extends { _id?: RefType; } ? NonNullable<PopulatedType['_id']> : Types.ObjectId) | undefined   > = PopulatedType | RawId;
   interface PopulateOptions {     /** space delimited path(s) to populate */     path: string;     /** fields to select */     select?: any;     /** query conditions to match */     match?: any;     /** optional model to use for population */     model?: string | Model<any>;     /** optional query options like sort, limit, etc */     options?: QueryOptions;     /** correct limit on populated array */     perDocumentLimit?: number;     /** optional boolean, set to `false` to allow populating paths that aren't in the schema */     strictPopulate?: boolean;     /** deep populate */     populate?: string | PopulateOptions | (string | PopulateOptions)[];     /**     * If true Mongoose will always set `path` to a document, or `null` if no document was found.     * If false Mongoose will always set `path` to an array, which will be empty if no documents are found.     * Inferred from schema by default.     */     justOne?: boolean;     /** transform function to call on every populated doc */     transform?: (doc: any, id: any) => any;   }
   interface PopulateOption {     populate?: string | string[] | PopulateOptions | PopulateOptions[];   }}