The answer
Export it from one module and import it in another. Top-level variables in a module are private by default. Only explicitly exported values are accessible to importers.
Scope in ES Modules vs Scripts in JavaScript
How do you share a variable across ES modules?
More FAQs in Scope in ES Modules vs Scripts in JavaScript
In classic scripts, top-level var becomes a property of window and this is the global object. In ES modules, top-level variables are module-scoped (not global), this is undefined, and strict mode is automatic.
No. In ES modules, top-level var, let, const, and class are module-scoped. They are not properties of window and are only accessible outside the module if explicitly exported.
undefined. In classic scripts, top-level this is the global object (window). In ES modules, it is undefined to prevent accidental global mutation. Use globalThis if you need the global object.
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