Dynamic Imports (import())

The module is re-executed every time
The module is executed only the first time, and the same instance is reused for subsequent imports
When the same module is dynamically imported multiple times, it's executed only once: 1) JavaScript modules are singletons by design, whether loaded statically or dynamically, 2) The first import executes the module code and caches the module instance, 3) Subsequent imports reuse the cached module instance without re-executing the code, 4) This ensures consistent module state across the application, 5) The module's top-level code runs only once, during the first import, 6) This behavior is consistent across browsers and Node.js, 7) It allows safely importing the same module from different places without duplication, 8) This caching mechanism is an important characteristic of the JavaScript module system.
The browser decides whether to re-execute based on load
A new copy of the module is created each time but not executed