he/him 
IMO constant should be constant. const FOO = 'FOO'; const BAR = 'BAR'; const f = (x: FOO | BAR) => whatever; The function accepts only "one of" to pattern match later, not a generic string. btw should be possible with third variant too
In the following example, what do you expect the type of `foo` to be? Answer according to what you'd expect, not how you think your type system works. const foo = 'FOO';
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I'm a bit annoyed to type `const FOO: 'FOO' = 'FOO';`
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goodness, type intersections make me have soo many opinions here.
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Why FOO?
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What behavior would you want? Would you want something different for this? let x = ‘FOO’;
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I think it should be just FOO with FOO inheriting from string and so if you what to use the type FOO you can and if you want to use this variable in a function that only allows strings, you can too
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