Error attempting to use Grapher: .clone is not a function

Using basically a modified version of the example in the documentation at the “Dynamic Filter” section here: Grapher Documentation

Regular queries are working, but if I attempt to use clone on any reusable queries, it’s not working. Here’s my code:


import {ProductCollection} from "../db/ProductCollection";

export default ProductCollection.createQuery(
    $filter({filters, options, params}) {
        filters.code = params.code;
    $options: {sort: {code: -1}},
    code: 1,
    price: 1,
    author: 1


import { check } from 'meteor/check';
import { ProductCollection } from "../db/ProductCollection";
const { DateTime } = require("luxon");
import {Match} from 'meteor/check';
import productQuery from "./productQuery"; // Grapher query instance


    'products.get'() {

        if (!this.userId) {
            throw new Meteor.Error('Access Denied: User not authenticated.');

        // Example query
        return productQuery.clone({
            code: "0000"

This results in:

I20211118-11:06:05.823(-8)? Exception while invoking method 'products.get' TypeError: productQuery.clone is not a function
I20211118-11:06:05.824(-8)?     at MethodInvocation.products.get (imports/api/productMethods.js:38:29)
I20211118-11:06:05.824(-8)?     at maybeAuditArgumentChecks (packages/ddp-server/livedata_server.js:1885:12)
I20211118-11:06:05.825(-8)?     at packages/ddp-server/livedata_server.js:769:19
I20211118-11:06:05.825(-8)?     at Meteor.EnvironmentVariable.EVp.withValue (packages\meteor.js:1257:12)
I20211118-11:06:05.826(-8)?     at packages/ddp-server/livedata_server.js:767:46
I20211118-11:06:05.826(-8)?     at Meteor.EnvironmentVariable.EVp.withValue (packages\meteor.js:1257:12)
I20211118-11:06:05.827(-8)?     at packages/ddp-server/livedata_server.js:765:46
I20211118-11:06:05.827(-8)?     at new Promise (<anonymous>)
I20211118-11:06:05.828(-8)?     at Session.method (packages/ddp-server/livedata_server.js:739:23)
I20211118-11:06:05.828(-8)?     at packages/ddp-server/livedata_server.js:603:43

Any ideas how to resolve this error? I tried searching and strangely I can’t find anyone else who encountered this issue…