Stack and heap memory must be allocated statically by the programmer but calculating the space required is notoriously difficult for all but the smallest embedded systems.

In VS Code 1.66, the JavaScript debugger now supports collecting and visualizing heap profiles, so developers can see where and how much memory is being allocated over time.

ASLR, as it's more often referred to, randomizes the memory locations for the library, stack, heap, and most other OS data structures.