It's always been my rule of thumb.
Use const. If you need to reassign it, change the variable to let. No reason to use var anymore.
One reason to use var: prototype something in the browser console and get something wrong, for that session your const won't be changeable, so use var for fast prototyping
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re: Demystifying "const" variables in JavaScript VIEW POST
TOP OF THREAD FULL DISCUSSIONIt's always been my rule of thumb.
Use const. If you need to reassign it, change the variable to let. No reason to use var anymore.
One reason to use var: prototype something in the browser console and get something wrong, for that session your const won't be changeable, so use var for fast prototyping