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I know I should use const. I lazily leave it until the end then try to shoe-horn it in. Then it ripples through the code until I give up. Then I hate myself.

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I've started to use const for every variable, then if I get an linting error about modifying a const, I switch it to let.

It took about two weeks to train my hands/brain to type const before let/var.

I use https://www.npmjs.com/package/eslint-plugin-const-immutable for linting const usage. It even detects object props mutation!

This is what makes Eslint so great. If you extend Airbnb's (or write your own very strict) config, it will really enforce best practices for things like this.

I think running eslint --fix will even change your "let"s to "const"s where appropriate, but don't quote me on that.

--fix is a godsend.

>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)_/¯

You're looking for: http://eslint.org/docs/rules/prefer-const

It does exactly what you describe :)

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