How to use the @hpcc-js/leaflet-shim.LatLngBounds function in @hpcc-js/leaflet-shim

getBounds() {
        return new LatLngBounds([20, -123], [49, -64]);
    }
}

const data = this.data().filter(row => !this.omitNullLatLong() || (!!row[latIdx] && !!row[longIdx])).map(row => {
            if (!bounds) {
                bounds = new LatLngBounds([row[latIdx], row[longIdx]]);
            } else {
                bounds.extend([row[latIdx], row[longIdx]]);
            }
            return [row[latIdx], row[longIdx], this.weightColumn_exists() ? row[weightIdx] : 0.5];
        });
        const heat = new LHeatLayer(data, {

getBounds() {
        const retVal = super.getBounds();
        return new LatLngBounds([retVal.getNorth(), retVal.getWest()], [17.755278, -64.565]);
    }