How to use the node-opcua-service-subscription.ContentFilterResult function in node-opcua-service-subscription

function analyseEventFilterResult(node, eventFilter) {
    assert(eventFilter instanceof EventFilter);
    const selectClauseResults = checkSelectClauses(node, eventFilter.selectClauses);

    const whereClauseResult = new subscription_service.ContentFilterResult();

    return new subscription_service.EventFilterResult({
        selectClauseResults: selectClauseResults,
        selectClauseDiagnosticInfos: [],
        whereClauseResult: whereClauseResult
    });
}