Node.js module system + purge the cache for CJS

Follow comments carefully within code source . A few important assumptions emphasized tho :

• module .require(d) synchronously
• module cached the very first time it's required : every subsequent require will point to the same module's reference
• not possible to require() files that have the .mjs extension : attempting to do so will throw an error as it's reserved for ESM

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References:

• require() algorithm
• dev.to embedding guide