In some Files like “juce\extras\audio plugins\wrapper\juce_PluginHeaders.h” is a direct include of “…/…/…/juce_amalgamated.h”, but i prefer working with the original Juce-Project file.
There should be be a warning if somebody tries to mix amalgamated with non-amalgamated code
#if ! (defined (JUCE_REGULAR) || defined (JUCE_AMALAGATED))
#error You are trying to mix amalgamated with non-amalgamated code