BrightSign BrightScript 2 Reference Guide - Manual (Page 22)

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Scope
BrightScript uses the following scoping rules:

Currently all related BrightScript code must reside in one file. This set of code is
known as a “module”.

BrightScript does not support global variables. Except, there is one hard-coded
global variable “global” that is an interface to the global object. The global object
contains all global library functions.

Functions declared with the FUNCTION statement are at global scope, unless
they are anonymous, in which case they are local scope.

Local variables exist with function Scope. If a function calls another function,
that new function has its own scope.

Labels exist in function scope.

Block Statements (like FOR-NEXT or WHILE-END WHILE) do not create a
separate scope