maybe another time
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No work is best work
I've never found these tools to work 100% accurately. And the process doesn't really scale across dozens of templates with different sub-header layouts (in an active codebase).
It depends on what the tool is doing, the coverage based tools are :( I agree, but we are just stripping out the conditional parts of state and it seems to be working fine for us. We do have a big build farm for each header layout though too. Would be interested to talk more.
cc @bezoerb (critical) @pocketjoso (penthouse) @scottjehl (Filament Critical CSS) who have done awesome work in the critical CSS tools space and may also have thoughts here.. :)
css-in-js does critical CSS by default!
I’ve had some success with Lighthouse specifically when coupled static site generators that can do it for each individual page. Using it with dynamically generated pages has been more difficult. Don’t build many SPAs, but imagine similar difficulties.
The little bit of @vuejs I’ve used I’ve been happy with its ability to determine and inline critical CSS via what components are used (I used regular component CSS, but I presume CSS-in-JS has the same ability)
Critical is great 
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