🔰top-level scope
JS ⟩ concepts ⟩ scope ⟩ top-level
top-level scope relative to a JS file.
in Node.js：module scope ( top-level this ===
module.exports)in browser：
script mode： global scope.
module mode： module scope
global variables don't get created by declaring variables in the top-level scope of a module (module scope).
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