[typescript] filter is not used

Is your feature request related to a problem? Please describe.

By generating the openapi file of Loopback 4, each route can contain a filter. It is well generated by the generator, but in the code it is not used. (Tested with Axios, fetch in TypeScript)

Describe the solution you'd like

When a function waits for a filter, this should be sent in the request

Additional context

projectControllerFind(filter?: object, options: any = {}): RequestArgs {
            const localVarPath = `/projects`;
            const localVarUrlObj = globalImportUrl.parse(localVarPath, true);
            let baseOptions;
            if (configuration) {
                baseOptions = configuration.baseOptions;
            }
            const localVarRequestOptions = { method: 'GET', ...baseOptions, ...options};
            const localVarHeaderParameter = {} as any;
            const localVarQueryParameter = {} as any;

            if (filter !== undefined) {
                localVarQueryParameter['filter'] = filter;
            }

            localVarUrlObj.query = {...localVarUrlObj.query, ...localVarQueryParameter, ...options.query};
            // fix override query string Detail: https://stackoverflow.com/a/7517673/1077943
            delete localVarUrlObj.search;
            localVarRequestOptions.headers = {...localVarHeaderParameter, ...options.headers};

            return {
                url: globalImportUrl.format(localVarUrlObj),
                options: localVarRequestOptions,
            };
        }

Request example :
localhost:3000/users?filter[where][name]=test
localhost:3000/users?filter[limit]=5

Thanks

Start by inspecting the generated TypeScript client method shown in the issue and trace how its query parameters are serialized. Add coverage for filter values such as filter[where][name] and filter[limit], and verify that generated requests include the filter in the URL.