JavaScript Modules (import/export)

Variables declared in a module scope remain private to that module unless explicitly exported: 1) Each module has its own scope, isolated from other modules and the global scope, 2) Variables, functions, and classes are not accessible outside the module unless exported, 3) This provides natural encapsulation and helps prevent global namespace pollution, 4) Even imported modules cannot access non-exported members of the module, 5) This behavior enforces better code organization and explicit interface design, 6) It helps in maintaining privacy for internal implementation details, 7) This is different from traditional scripts where variables might leak into the global scope.