40 columns                              |
>>> empty map
var m = { };
<<<
var m = {};
>>> exactly 40 characters
var m = {first: second, third: forth__};
<<<
var m = {first: second, third: forth__};
>>>
var m = {first: second, third: fourth, fifth: sixth};
<<<
var m = {
  first: second,
  third: fourth,
  fifth: sixth
};
>>> splits outer maps even if they fit
var m = {a: {b: c}, d: {},
    e: {f: {g: h} }  };
<<<
var m = {
  a: {b: c},
  d: {},
  e: {
    f: {g: h}
  }
};
>>> split indirect outer
var m = {a: function({b: inner})};
<<<
var m = {
  a: function({b: inner})
};
>>> empty literal does not force outer split
var m = {a:{}, b: [], c: () {}};
<<<
var m = {a: {}, b: [], c: () {}};
>>> nested split map
var m = {first: 1, second: {third: fourth}, fifth: 5, nested: {sixth: seventh, eighth: nine,
    tenth: eleventh}};
<<<
var m = {
  first: 1,
  second: {third: fourth},
  fifth: 5,
  nested: {
    sixth: seventh,
    eighth: nine,
    tenth: eleventh
  }
};
>>> force multi-line because of contained block
var m = {first: 1, fn: () {"fn";},third:fourth};
<<<
var m = {
  first: 1,
  fn: () {
    "fn";
  },
  third: fourth
};
>>> containing comments
var m = {first: one /* bang */, second: two};
<<<
var m = {
  first: one /* bang */,
  second: two
};
>>> const
var map = const {"foo": "bar", "fuz": null};
<<<
var map = const {
  "foo": "bar",
  "fuz": null
};
>>> dangling comma
var map = {"foo": "bar" , };
<<<
var map = {"foo": "bar",};
>>> dangling comma multiline
var map = {"foo": "bar", "fuzzy": null , };
<<<
var map = {
  "foo": "bar",
  "fuzzy": null,
};
>>> preserve newlines in maps containing a line comment
var map = {
  // yeah
  a:b,c:d,
  e:f,g:h
};
<<<
var map = {
  // yeah
  a: b, c: d,
  e: f, g: h
};
>>> wrap between elements even when newlines are preserved
var map = {
  // yes
  first: "value", second: "value", third: "value",

  fourth: "value", fifth: "value", sixth: "value", seventh: "value"
};
<<<
var map = {
  // yes
  first: "value", second: "value",
  third: "value",

  fourth: "value", fifth: "value",
  sixth: "value", seventh: "value"
};
>>> ignore line comment after the "]"
var map = {
  a:b,c:
  d
} // comment
;
<<<
var map = {a: b, c: d} // comment
    ;
>>> preserves one blank line between elements
var map = {


  element: value,


  // comment
  element: value,


  element: value


};
<<<
var map = {
  element: value,

  // comment
  element: value,

  element: value
};
>>> ignore newlines between keys and values
var map = {// comment
a:
value
};
<<<
var map = {
  // comment
  a: value
};