he/him 
I saw @dan_abramov do it
What's the point of: const FOOBAR = 'FOOBAR'; Over just inlining the string?
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the answer to all things JavaScript
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minifies well? And linters I think
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minifiers should outline it and gzip makes it moot
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a lot of time it's just used for events or types and the string value is always the same as the variable name so seems weird
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const MY_CONST = 'app/page/MY_CONST' to avoid naming collisions and misspellings.
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linter will tell you when you misspel it somewhere in that file. That's how I use it, at least
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compiler check + intellisense
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catching typos statically; although this can be also addressed by using a type system
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tractability and intention. I can confidently find and replace a constant imported across app, not so much a string.
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