How Node.js's require() works ??

require.js

const some_module = require('some_module')

/**
 * require('some_module') calls Module._load
 * 
 * Module._load then tries to load the module with a filename (also save it to the cache) using module.load(filename)
 *
 * module.load(filename), given a filename, passes it to the proper extension handler ('.js', '.json')
 *
 * If there were any errors when loading the file, it deletes the file from the cache (delete Module._cache[filename]) and throws an error
 *
 * Module._extension then compiles the file by reading the content of the filename (with an extension)
 * 
 * If there are no errors, it returns module.exports 😄
*/