I already submitted this issue but no one answered and someone labeled my post as question. I think I didn't make the point clear. The issue is the web site on production will not work properly while you are re-building for some code change. The website itself will work if you have cache, but if you are first time user and don't have cache bootstrap.js or fontawesome nuxt.js module will not be loaded and thus website will not work properly. The downtime is just while it is building (maybe 20~30 sec) but if you modify code frequently or if you have so many users it will be a serious problem.
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