Register an error handler. This is called before responding on any error.
Channel Provider
(async ()=> {
    const provider = await fin.InterApplicationBus.Channel.create('channelName');
    provider.register('provider-action', (payload, identity) => {
        console.log(payload);
        throw new Error('Action error');
        return {
            echo: payload
        };
    });
    provider.onError((action, error, identity) => {
        console.log('uncaught Exception in action:', action);
        console.error(error);
    });
})();Channel Client
(async ()=> {
    const client = await fin.InterApplicationBus.Channel.connect('channelName');
    client.register('client-action', (payload, identity) => {
        console.log(payload);
        throw new Error('Action error');
        return {
            echo: payload
        };
    });
    client.onError((action, error, identity) => {
        console.log('uncaught Exception in action:', action);
        console.error(error);
    });
})();