I’ve noticed significant changes in how JavaScript seems to store and manage variables, especially when debugging.

Previously, I could easily distinguish between variables declared with var, let, and const in the browser’s debugger. var variables were under the global window object, while let and const were in the Script object. I could also access these variables directly using window.variableName.

However, this behavior seems to have changed. Now, I can’t find these variables under the window object, and they all appear under a modules object in the debugger. Additionally, var variables show up as undefined, while let and const have <Value unavailable>.

I’m confused about how this affects variable scope, especially regarding the Temporal Dead Zone (TDZ).

• How does this new behavior work with the TDZ?
• Where are these variables actually stored now?

Any insights or explanations would be greatly appreciated.