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Re:Overview of JavaScript ES6 features by rkwz on Monday October 24, 2016 @03:21PM (#12781951)
>I think running eslint --fix will even change your "let"s to "const"s where appropriate, but don't quote me on that.

Yep, this is the relevant rule - http://eslint.org/docs/rules/no-var

Though it just replaces all var with let. I expected it to intelligently use either const or let depending on how the variable is used ¯\_(ツ)_/¯

Re:Overview of JavaScript ES6 features by Zirro on Monday October 24, 2016 @07:23PM (#12783818)
You're looking for: http://eslint.org/docs/rules/prefer-const

It does exactly what you describe :)