How to use the breeze-client.FetchStrategy function in breeze-client

if (currentUser.isAuthenticated()) {
            query = query.expand("User, UserResourcePoolSet, ElementSet.ElementFieldSet.UserElementFieldSet, ElementSet.ElementItemSet.ElementCellSet.UserElementCellSet");
        } else {
            query = query.expand("User, ElementSet.ElementFieldSet, ElementSet.ElementItemSet.ElementCellSet");
        }

        var userNamePredicate = new breeze.Predicate("User.UserName", "eq", resourcePoolUniqueKey.userName);
        var resourcePoolKeyPredicate = new breeze.Predicate("Key", "eq", resourcePoolUniqueKey.resourcePoolKey);

        query = query.where(userNamePredicate.and(resourcePoolKeyPredicate));

        // From server or local?
        if (!fetchedEarlier) {
            query = query.using(breeze.FetchStrategy.FromServer);
        } else {
            query = query.using(breeze.FetchStrategy.FromLocalCache);
        }

        return dataContext.executeQuery(query)
            .then(success)
            .catch(failed);

        function success(response: any) {

            // If there is no cmrp with this Id, return null
            if (response.results.length === 0) {
                return null;
            }

            // ResourcePool
            var resourcePool = response.results[0];

function getResourcePoolSet(searchKey: any) {
        searchKey = typeof searchKey !== "undefined" ? searchKey : "";

        var query = breeze.EntityQuery
            .from("ResourcePool")
            .expand(["User"]);

        if (searchKey !== "") {
            var resourcePoolNamePredicate = new breeze.Predicate("Name", "contains", searchKey);
            var userNamePredicate = new breeze.Predicate("User.UserName", "contains", searchKey);
            query = query.where(resourcePoolNamePredicate.or(userNamePredicate));
        }

        // Prepare the query
        //if (fetchFromServer) { // From remote
        query = query.using(breeze.FetchStrategy.FromServer);
        //    fetchFromServer = false; // Do it only once per user
        //}
        //else { // From local
        //query = query.using(breeze.FetchStrategy.FromLocalCache);
        //}

        return dataContext.executeQuery(query)
            .then(success).catch(failed);

        function success(response: any) {
            return response.results;
        }

        function failed(error: any) {
            var message = error.message || "ResourcePool query failed";
            logger.logError(message, error, true);

function getUser(userName: any) {

        // Already fetched, then query locally
        var alreadyFetched = fetchedUsers.some(fetched => (userName === fetched));

        var query = breeze.EntityQuery
            .from("Users")
            .expand("ResourcePoolSet")
            .where("UserName", "eq", userName);

        // From server or local?
        if (alreadyFetched) {
            query = query.using(breeze.FetchStrategy.FromLocalCache);
        } else {
            query = query.using(breeze.FetchStrategy.FromServer);
        }

        return executeQuery(query)
            .then(success)
            .catch(failed);

        function success(response: any);
        function success(response) {

            // If there is no result
            if (response.results.length === 0) {
                return null;
            }

            var user = response.results[0];

function getUser(userName: any) {

        // Already fetched, then query locally
        var alreadyFetched = fetchedUsers.some(fetched => (userName === fetched));

        var query = breeze.EntityQuery
            .from("Users")
            .expand("ResourcePoolSet")
            .where("UserName", "eq", userName);

        // From server or local?
        if (alreadyFetched) {
            query = query.using(breeze.FetchStrategy.FromLocalCache);
        } else {
            query = query.using(breeze.FetchStrategy.FromServer);
        }

        return executeQuery(query)
            .then(success)
            .catch(failed);

        function success(response: any);
        function success(response) {

            // If there is no result
            if (response.results.length === 0) {
                return null;
            }