TODO

- avoid coffee-only keywords eg var named no
- ==/!= - convert == null to ?
- suck up multiple conditional assignment paths? eg:
  if a
    b = c
  else
    b = d
  into:
  b =
    if a
      c
    else
      d
- transform if a isnt b to unless a is b
- a && (a.b || a.c) -> a?.b || a.c isn't safe, needs to distribute ?
- remove unnecessary explicit returns? eg trailing switch's cases
- detect when should generate => rather than -> (arrow function that references this?)
- try and detect when can use shorthand @arg (eg function body starts with this.arg = arg)
  - would have to find other "bare" references and eg transform arg -> @arg there as well
- class get/setters?
- why is eslint/util/ast-utils.js failing?
- don't remove break inside switch case if it would apply to a different eg loop
- detect binding of method in constructor and convert to bound method
- a = a or b -> a or= b
- do while
- remove break-only (default) switch case
- don't generate postfix if when expression is something dangerous that would need parense (eg return () -> ... was generating incorrect/invalid code)
- generate range from .slice()?