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As far as I know, Google does index SPAs that are only rendered in the browser.

Google does not index my ng2 site without prerendering.

There will be always limits for search engines on interpreting js.

That's interesting. I previously researched this with regard to React apps, and the tenor was that server-side rendering was no longer required in order to get indexed by Google.

Google itself has this to say:

https://webmasters.googleblog.com/2014/05/understanding-web-...

Have you tried to figure out the cause using Search Console?

I have also encountered an Angular 1 app in the wild that was indexed by Google, but there are limits to the ability of their crawler - it apparently didn't follow through to other pages.

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