[backport] PR #6653 to 4.x #6689
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--------- **Commit 1:** [internal] Replace empty var declaration with let Any time there is a variable defined in a JS file without also storing a value in it, we know that definition cannot be converted to a const, so we convert it to a let. For example: `var blah;` becomes `let blah;` Some of these things variables might be unused, and many others can likely be switched to const with only minor refactoring, but the commit is very large, so there are no changes in it other than the 1:1 switch. * Original sha: bfc59e9 * Authored by Court Ewing <court@epixa.com> on 2016-03-24T22:27:29Z
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Backport PR #6653
Commit 1:
[internal] Replace empty var declaration with let
Any time there is a variable defined in a JS file without also storing a
value in it, we know that definition cannot be converted to a const, so
we convert it to a let.
For example:
var blah;becomeslet blah;Some of these things variables might be unused, and many others can
likely be switched to const with only minor refactoring, but the commit
is very large, so there are no changes in it other than the 1:1 switch.