Using [email protected] with the Atom Beta, the XO linter can not seem to find its own integrated version of eslin-plugin-unicorn. It outputs a variety of errors in the very first line of the code.

I already reinstalled the linter package, as well as xo with apm more than once.
With Atom releasing 1.17.0, this is no longer just in Atom Beta.
Should be fixed now. See: https://github.com/sindresorhus/atom-linter-xo/issues/74#issuecomment-309195313
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With Atom releasing
1.17.0, this is no longer just in Atom Beta.