Local variables can even be declared with the same name as a global variable. If this happens, there are actually two different variables with the same name: one local and one global. This helps ensure that an author writing a local variable doesn’t accidentally change the value of a global variable they aren’t even aware of.

Paths are traversed in the order they occur in the search path. By default, this means the files in app/assets take precedence, and will mask corresponding paths in lib and vendor.

Otherwise, please take the time to read about declarations hoisting (MDN, Adequately Good) and variable shadowing, as these concepts are key to fully understanding TDZ.