How to use the ms-rest-azure.MSITokenCredentials function in ms-rest-azure

this.tokenRenewalMarginInSeconds = 270;
        /**
         * @property {number} tokenValidTimeInSeconds - The number of seconds for which the
         * token is valid. A constant set to 3599 seconds (~1 hour). Adal has a set valid time of
         * 1 hour (3600 seconds) when it refreshes the access token.
         */
        this.tokenValidTimeInSeconds = 3599;
        if (!credentials ||
            (credentials &&
                !(credentials instanceof ms_rest_azure_1.ApplicationTokenCredentials ||
                    credentials instanceof ms_rest_azure_1.UserTokenCredentials ||
                    credentials instanceof ms_rest_azure_1.DeviceTokenCredentials ||
                    credentials instanceof ms_rest_azure_1.MSITokenCredentials))) {
            throw new Error("'credentials' is a required parameter and must be an instance of ApplicationTokenCredentials | UserTokenCredentials | DeviceTokenCredentials | MSITokenCredentials.");
        }
        if (credentials instanceof ms_rest_azure_1.MSITokenCredentials) {
            credentials.resource = Constants.aadEventHubsAudience;
        }
        this.credentials = credentials;
    }
    /**

static createFromAadTokenCredentials(host, entityPath, credentials) {
        if (!host || (host && typeof host !== "string")) {
            throw new Error("'host' is a required parameter and must be of type: 'string'.");
        }
        if (!entityPath || (entityPath && typeof entityPath !== "string")) {
            throw new Error("'entityPath' is a required parameter and must be of type: 'string'.");
        }
        if (!credentials ||
            !(credentials instanceof ms_rest_azure_1.ApplicationTokenCredentials ||
                credentials instanceof ms_rest_azure_1.UserTokenCredentials ||
                credentials instanceof ms_rest_azure_1.DeviceTokenCredentials ||
                credentials instanceof ms_rest_azure_1.MSITokenCredentials)) {
            throw new Error("'credentials' is a required parameter and must be an instance of ApplicationTokenCredentials | UserTokenCredentials | DeviceTokenCredentials | MSITokenCredentials.");
        }
        if (!host.endsWith("/"))
            host += "/";
        const connectionString = `Endpoint=sb://${host};SharedAccessKeyName=defaultKeyName;SharedAccessKey=defaultKeyValue`;
        const tokenProvider = new aad_1.AadTokenProvider(credentials);
        return EventHubClient.createFromConnectionString(connectionString, entityPath, tokenProvider);
    }
}

static createFromAadTokenCredentials(host, entityPath, credentials) {
        if (!host || (host && typeof host !== "string")) {
            throw new Error("'host' is a required parameter and must be of type: 'string'.");
        }
        if (!entityPath || (entityPath && typeof entityPath !== "string")) {
            throw new Error("'entityPath' is a required parameter and must be of type: 'string'.");
        }
        if (!credentials ||
            !(credentials instanceof ms_rest_azure_1.ApplicationTokenCredentials ||
                credentials instanceof ms_rest_azure_1.UserTokenCredentials ||
                credentials instanceof ms_rest_azure_1.DeviceTokenCredentials ||
                credentials instanceof ms_rest_azure_1.MSITokenCredentials)) {
            throw new Error("'credentials' is a required parameter and must be an instance of ApplicationTokenCredentials | UserTokenCredentials | DeviceTokenCredentials | MSITokenCredentials.");
        }
        if (!host.endsWith("/"))
            host += "/";
        const connectionString = `Endpoint=sb://${host};SharedAccessKeyName=defaultKeyName;SharedAccessKey=defaultKeyValue`;
        const tokenProvider = new aad_1.AadTokenProvider(credentials);
        return EventHubClient.createFromConnectionString(connectionString, entityPath, tokenProvider);
    }
}

* good to renew the token. A constant set to 270 seconds (4.5 minutes). Adal has a set window of 5 minutes
         * when it refreshes the token from its token cache.
         */
        this.tokenRenewalMarginInSeconds = 270;
        /**
         * @property {number} tokenValidTimeInSeconds - The number of seconds for which the
         * token is valid. A constant set to 3599 seconds (~1 hour). Adal has a set valid time of
         * 1 hour (3600 seconds) when it refreshes the access token.
         */
        this.tokenValidTimeInSeconds = 3599;
        if (!credentials ||
            (credentials &&
                !(credentials instanceof ms_rest_azure_1.ApplicationTokenCredentials ||
                    credentials instanceof ms_rest_azure_1.UserTokenCredentials ||
                    credentials instanceof ms_rest_azure_1.DeviceTokenCredentials ||
                    credentials instanceof ms_rest_azure_1.MSITokenCredentials))) {
            throw new Error("'credentials' is a required parameter and must be an instance of ApplicationTokenCredentials | UserTokenCredentials | DeviceTokenCredentials | MSITokenCredentials.");
        }
        if (credentials instanceof ms_rest_azure_1.MSITokenCredentials) {
            credentials.resource = Constants.aadEventHubsAudience;
        }
        this.credentials = credentials;
    }
    /**