How to use the node-opcua-service-secure-channel.hasTokenExpired function in node-opcua-service-secure-channel

private _add_new_security_token() {

        this._stop_security_token_watch_dog();
        this.lastTokenId += 1;

        this.channelId = this.__hash;
        assert(this.channelId > 0);

        const securityToken = new ChannelSecurityToken({
            channelId: this.channelId,
            createdAt: new Date(), // now
            revisedLifetime: this.revisedLifetime,
            tokenId: this.lastTokenId // todo ?
        });

        assert(!hasTokenExpired(securityToken));
        assert(_.isFinite(securityToken.revisedLifetime));

        this.securityToken = securityToken;

        debugLog("SecurityToken", securityToken.tokenId);

        this._start_security_token_watch_dog();
    }