replace-in-file

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The ToCallback type definition indicates the second argument should be string, but actually the function takes the same shape as a String.prototype.replace replacer.

Unfortunately, there's not a surefire way to type a replacer as it's not statically analyzable. Instead of passing all arguments to the ToCallback function, it would be more sound (in my opinion), to do something like this:

contents.replace(item, (...args) => replacement(args[0], args.pop()));