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No index & test Indexing Before You Launch The domains are intended for development use and cannot be used for production. A custom or CMS-standard will only work robots.txt on Live environments with a custom domain. Adding sub-domains (i.e., dev.example.com , ``test.example.com) for DEV or TEST will remove the header only, X-Robots-Tag: noindex but still, serve the domain. robots.txt  To support pre-launch SEO testing, we allow the following bots access to platform domains: Site Auditor by Raven SEMrush RogerBot by Moz Dotbot by Moz If you’re testing links or SEO with other tools, you may request the addition of the tool to our robots.txt Pantheon's documentation on robots.txt: http://pantheon.io/docs/articles/sites/code/bots-and-indexing/User-agent: * Disallow: / User-agent: RavenCrawler User-agent: rogerbot User-agent: dotbot User-agent: SemrushBot User-agent: SemrushBot-SA Allow: /

Hey there, One thing is for sure - js and css files have no value to your site's SEO. If your site is looking good and working well under the new design there's no point in worrying about this. Good luck!!