In short, a proper module is a black box, responsible for an independent flow (i.e. process). Other modules act upon it via its programming API (i.e. calls to class methods). And it doesn’t allow other modules to query its datasource directly (by bypassing the API).
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There are also shell functions (pay attention, they are not files!, they are bash functions), which are expected to control the build, and they also seem to have bit-rotted a bit.
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