Memory Management: Using 'WeakMap' for Storing Meta-Data in Vue Plugins

WeakMap allows you to associate data with a component instance (or any object) without preventing that instance from being garbage collected.

In complex plugins (like a validation engine or a tooltip manager), you often need to store metadata about specific component instances. If you use a standard Map or a global array, the reference to the component instance persists even after the component is unmounted, causing a memory leak. WeakMap holds 'weak' references, meaning if the component instance is destroyed, the entry in the WeakMap is automatically cleared.