Enable no-use-before-define rule #13606
Merged
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This would have caught #13582 (comment).
For now, I had to add suppressions for cyclical Flow references but we can remove this after babel/babel-eslint#584 is merged and released.
I also enabled it for classes. Maybe this is excessive but I figured it doesn't hurt since classes aren't hoisted. I had to reorder two places because of that but it's just copy paste.