How to use the @hapi/hoek.reachTemplate function in @hapi/hoek

}

    const auth = this._server.auth.lookup({ settings: { auth: match.route.auth } });         // Create a synthetic route
    if (auth) {
        const credentials = socket.auth.credentials;
        if (credentials) {

            // Check scope

            if (auth.scope) {
                let scopes = auth.scope;
                if (auth.hasScopeParameters) {
                    scopes = [];
                    const context = { params: match.params };
                    for (let i = 0; i < auth.scope.length; ++i) {
                        scopes[i] = Hoek.reachTemplate(context, auth.scope[i]);
                    }
                }

                if (!credentials.scope ||
                    (typeof credentials.scope === 'string' ? !scopes.includes(credentials.scope) : !Hoek.intersect(scopes, credentials.scope).length)) {

                    throw Boom.forbidden('Insufficient scope to subscribe, expected any of: ' + scopes);
                }
            }

            // Check entity

            const entity = auth.entity || 'any';
            if (entity === 'user' &&
                !credentials.user) {

internals.expandScopeType = function (request, scope, type) {

    if (!scope._hasParameters[type]) {
        return scope[type];
    }

    const expanded = [];
    const context = {
        params: request.params,
        query: request.query,
        payload: request.payload,
        credentials: request.auth.credentials
    };

    for (const template of scope[type]) {
        expanded.push(Hoek.reachTemplate(context, template));
    }

    return expanded;
};