Linebreaks after 'get' or 'set' in class bodies are not parsed correctly (T7533)

[motiz88]

Issue originally made by @bakkot (as T7533 and later babel/babel#4432)

Input code

class A {
  get
    x(){}
}

Description

This code gives a parse error without the class-properties-transform plugin, and is parsed as a class containing a single method x with it. Neither is correct; it's valid syntax for a class with a getter (not method) for 'x'.

[motiz88]

All parsers on ast-explorer.net, except for TypeScript, disagree with Babylon's parse here.

[bakkot]

The issue is larger than I initially reported. All of the following are incorrectly rejected:

class C {
  x
  (){}
}

class C {
  ''
  (){}
}

class C {
  ['']
  (){}
}

class C {
  get
  (){}
}

class C {
  set
  (){}
}

class C {
  static
  (){}
}

class C {
  async
  (){}
}

etc., which define methods named 'x', '', 'get', 'set', 'static', or 'async'.

[danez]

Fixed as of 6.17.0