he/him 
524 files, 40,000 lines of code, all linted in 3 seconds. Wall time.pic.twitter.com/uIUswozjRM
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What sort of lint rules? Are some more intense than others, I'd imagine?
There are very few lint rules. But a lint rule is the exact same as a compiler transform. You have access to the same AST introspection, and can even return new AST nodes as a "fix". A majority of the overhead is already there. Should scale easily with more rules.
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Didn't really answer this very well. Only about a dozen. However, lint rules (AKA compiler transforms) are all optimized into a single traversal, with reactive scope tracking, and utilities methods are available to prevent subtraversals and introspection. So will scale well.
Thanks. Twitter will use this to make your timeline better. UndoUndo
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