How to use the node-opcua-service-endpoints.ApplicationType.Server function in node-opcua-service-endpoints

}
    return filename;
}

const default_server_info = {

    // The globally unique identifier for the application instance. This URI is used as
    // ServerUri in Services if the application is a Server.
    applicationUri: "urn:NodeOPCUA-Server-default",

    // The globally unique identifier for the product.
    productUri: "NodeOPCUA-Server",

    // A localized descriptive name for the application.
    applicationName: { text: "NodeOPCUA", locale: null },
    applicationType: ApplicationType.Server,
    gatewayServerUri: "",

    discoveryProfileUri: "",

    discoveryUrls: []
};

function cleanupEndpoint(endpoint: OPCUAServerEndPoint) {

    if (endpoint._on_new_channel) {
        assert(_.isFunction(endpoint._on_new_channel));
        endpoint.removeListener("newChannel", endpoint._on_new_channel);
        endpoint._on_new_channel = undefined;
    }

    if (endpoint._on_close_channel) {

function _isValidServerType(serverType: ApplicationType): boolean {

    switch (serverType) {
        case ApplicationType.Client:
            return false;
        case ApplicationType.Server:
        case ApplicationType.ClientAndServer:
        case ApplicationType.DiscoveryServer:
            return true;
    }
    return false;
}