Can watch dust file, but content doesn't change

[Castafiore]

I am using dust as template engine in my express project. I wrote code below:

var lrserver = require('livereload').createServer({
  exts: ['html', 'dust', 'css', 'js', 'png', 'gif', 'jpg', 'jpeg', 'svg']
});
lrserver.watch([path.join(__dirname, 'public'), path.join(__dirname, 'views')]);

When I run my project and visit one page, I change some stuff in the corresponding dust file and save it, I can see the page refresh, but the content doesn't change.
Can anybody help me?

[Castafiore]

Finally I've found the reason in official documentation below:
http://krakenjs.com/adaro.html

app.engine('dust', adaro.dust({
  cache: false,
  helpers: [
    'dustjs-helpers',
    'dustjs-helpers-extra'
  ]
}));

The property cache is defaults to true. Setting it to false will disable caching of templates in the dust cache.
In order to make dust file content change reflect on page, we need to set cache to false.