The following excerpt contains the fluid, moderated and opinionated list of some of my preferred tools used in conjunction with Clojure or which greatly increase either productivity, offers key insight and often (related) faster debugging, easier deployment, less errors (many linters can be found here) and so on.
As the entire playing field of what is commonly known as the 'Magento framework' (or system) encompasses a great deal of interwoven components and technologies, when we take a most top-level view of matters, we distinguish these major forms
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PHP (unique) own implementation of the MVC pattern of software design — Models as code representatives/agents of data; used throughout core code and which touches the edges of the Object Relational Model interoperability tasked objects