How to use the md5/md5 function in md5

if(query && query.progress === 'new' && query.layers.length > 0) {
                // issue a 'started' modification so the query is
                //  not run twice.
                this.props.store.dispatch(mapActions.startQuery(query_id));
                // run the query.
                this.runQuery(queries, query_id);
            }
        }

        if(queries.order.length > 0) {
            const query_id = queries.order[0];
            const query = queries[query_id];
            if(query.progress === 'finished') {
                // check the filters
                const filter_json = JSON.stringify(query.filter);
                const filter_md5 = md5(filter_json);

                if(this.currentQueryId !== query_id
                   || this.currentQueryFilter !== filter_md5) {

                    this.renderQueryLayer(query);
                    this.currentQueryId = query_id;
                    this.currentQueryFilter = filter_md5;
                }
            }
        } else {
            // once there are no more queries,
            //  clear the results from the map.
            const results = this.props.mapSources.results;
            if(results && results.features && results.features.length > 0) {
                this.props.store.dispatch(mapSourceActions.clearFeatures('results', 'results'));
            }