Speedy mode is harmful for some production use cases (f.e. server-side rendering, prerendering, especially when glamor used in the library, etc)

[nikitaeverywhere]

Hello! I am writing from react-images library context, which turns to use glamor (or its kinda old version glam) for styles. I know this won't fix this library but at least it will fix all future dependencies.

speedy mode is harmful to applications which are pre-rendered (for example, prerender.io). As a result, search engines do not receive intended CSS (because it is cut by speedy mode in production builds).

The ultra-hack I needed to apply to fix my case was to run through all generated JavaScript code and replace this.isSpeedy there, as the library was already built & compiled:

sed -i 's/this\.isSpeedy\&\&/false\&\&/g' ./build/static/js/*