I've been keeping an eye on Svelte since seeing Rich Harris do his presentation at JSConf 2018. The early versions had some weird requirements in terms of code structure - that were tolerable given the benefits it provided - but v3 is a massive improvement. It now feels really effortless to write component-based applications: so little boiler-plate but plenty of power :)
Not sure it's established enough to use in a large production app just yet; but all my personal projects are going to be written using Svelte from now on.
For complex server-rendered apps with Svelte components also see Sapper
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