he/him 
Strings are terrible representations for file paths. You end up having to do way more work to process them when you're passing it around. Extracting extensions, basenames, crawling up the directory chain etc.
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I wrote a file path library for Rome where you construct a FilePath instance. It memoizes work, and you use methods to create derivative paths. eg. adding on an extension (useful for module resolution) etc.
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It understands the mutations and can efficiently create a variant with the previous memoized work.
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Does it handle Windows UNC (network) paths though?
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Infinitely better. Also seems like something that would allow you to deal with crazy situations like Windows pathnames or virtual file systems more more elegantly, right?
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I did something similar in the past. Changed the game for that sort of work. Made identifying paths as well as creating them easier
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Have been thinking of doing this in one of my projects. Sounds like its worthwhile?
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