How is Spree.config implemented?



I'm studying Spree's source code and I came across the snippet.


Spree.config do |config|
# Example:
# Uncomment to override the default site name.
# config.site_name = "Spree Demo Site"
end

How is this being implemented? I cannot find Spree.config defined anywhere as a method. I'm guessing some meta-programming is involved.


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