(JS-0242) Use `const` declarations for variables that are never reassigned

[HansEJC]

Description

Variables that are never re-assigned a new value after their initial declaration should be declared with the const keyword. This prevents the programmer from erroneously re-assigning to a read-only variable, and informs those reading the code that a variable is a constant value.

Occurrences

There are 16 occurrences of this issue in the repository.

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