I've been running into this error with composer lately as well, and with many different packages. The one fix that I've found is to the include the packages dependencies into your own composer.json file.
Not to the most ideal situation, but it seems to be fixing this issue for me.
You have to enable the php fileinfo extension in your wamp (or other php driver).
Solved. I was using another composer from another environment that didnt have the dependency. XAMPP, if you install PHP 5.3 you are not going to have that problem
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