[CS2] JavaScript keywords used as properties no longer require quoting

src/nodes.coffee

@@ -951,10 +951,7 @@ exports.Access = class Access extends Base
     name = @name.compileToFragments o
     node = @name.unwrap()
     if node instanceof PropertyName
-      if node.value in JS_FORBIDDEN
-        [@makeCode('["'), name..., @makeCode('"]')]
-      else
-        [@makeCode('.'), name...]
+      [@makeCode('.'), name...]
     else
       [@makeCode('['), name..., @makeCode(']')]
 
@@ -1781,9 +1778,6 @@ exports.Assign = class Assign extends Base
       if @variable.shouldCache()
         compiledName.unshift @makeCode '['
         compiledName.push @makeCode ']'
-      else if fragmentsToText(compiledName) in JS_FORBIDDEN
-        compiledName.unshift @makeCode '"'
-        compiledName.push @makeCode '"'
       return compiledName.concat @makeCode(": "), val
 
     answer = compiledName.concat @makeCode(" #{ @context or '=' } "), val

test/modules.coffee

@@ -770,7 +770,7 @@ test "#4451: `default` in an export statement is only treated as a keyword when
   input = "export default { default: 1 }"
   output = """
     export default {
-      "default": 1
+      default: 1
     };
   """
   eq toJS(input), output