test.js

(function() {
  var mode = CodeMirror.getMode({indentUnit: 2}, "javascript");
  function MT(name) { test.mode(name, mode, Array.prototype.slice.call(arguments, 1)); }

  MT("locals",
     "[keyword function] [variable foo]([def a], [def b]) { [keyword var] [def c] = [number 10]; [keyword return] [variable-2 a] + [variable-2 c] + [variable d]; }");

  MT("comma-and-binop",
     "[keyword function](){ [keyword var] [def x] = [number 1] + [number 2], [def y]; }");

  MT("destructuring",
     "([keyword function]([def a], [[[def b], [def c] ]]) {",
     "  [keyword let] {[def d], [property foo]: [def c]=[number 10], [def x]} = [variable foo]([variable-2 a]);",
     "  [[[variable-2 c], [variable y] ]] = [variable-2 c];",
     "})();");

  MT("class",
     "[keyword class] [variable Point] [keyword extends] [variable SuperThing] {",
     "  [[ [string-2 /expr/] ]]: [number 24],",
     "  [property constructor]([def x], [def y]) {",
     "    [keyword super]([string 'something']);",
     "    [keyword this].[property x] = [variable-2 x];",
     "  }",
     "}");

  MT("module",
     "[keyword module] [string 'foo'] {",
     "  [keyword export] [keyword let] [def x] = [number 42];",
     "  [keyword export] [keyword *] [keyword from] [string 'somewhere'];",
     "}");

  MT("import",
     "[keyword function] [variable foo]() {",
     "  [keyword import] [def $] [keyword from] [string 'jquery'];",
     "  [keyword module] [def crypto] [keyword from] [string 'crypto'];",
     "  [keyword import] { [def encrypt], [def decrypt] } [keyword from] [string 'crypto'];",
     "}");

  MT("const",
     "[keyword function] [variable f]() {",
     "  [keyword const] [[ [def a], [def b] ]] = [[ [number 1], [number 2] ]];",
     "}");

  MT("for/of",
     "[keyword for]([keyword let] [variable of] [keyword of] [variable something]) {}");

  MT("generator",
     "[keyword function*] [variable repeat]([def n]) {",
     "  [keyword for]([keyword var] [def i] = [number 0]; [variable-2 i] < [variable-2 n]; ++[variable-2 i])",
     "    [keyword yield] [variable-2 i];",
     "}");

  MT("fatArrow",
     "[variable array].[property filter]([def a] => [variable-2 a] + [number 1]);",
     "[variable a];", // No longer in scope
     "[keyword let] [variable f] = ([[ [def a], [def b] ]], [def c]) => [variable-2 a] + [variable-2 c];",
     "[variable c];");

  MT("spread",
     "[keyword function] [variable f]([def a], [meta ...][def b]) {",
     "  [variable something]([variable-2 a], [meta ...][variable-2 b]);",
     "}");

  MT("comprehension",
     "[keyword function] [variable f]() {",
     "  [[ [variable x] + [number 1] [keyword for] ([keyword var] [def x] [keyword in] [variable y]) [keyword if] [variable pred]([variable-2 x]) ]];",
     "  ([variable u] [keyword for] ([keyword var] [def u] [keyword of] [variable generateValues]()) [keyword if] ([variable-2 u].[property color] === [string 'blue']));",
     "}");

  MT("quasi",
     "[variable re][string-2 `fofdlakj${][variable x] + ([variable re][string-2 `foo`]) + [number 1][string-2 }fdsa`] + [number 2]");
})();