Removing breaks from the last switch case, and just disabling the lint warning instead.

extras/jsl.conf

@@ -11,7 +11,7 @@
 -comma_separated_stmts        # multiple statements separated by commas (use semicolons?)
 +unreachable_code             # unreachable code
 +missing_break                # missing break statement
-+missing_break_for_last_case  # missing break statement for last case in switch
+-missing_break_for_last_case  # missing break statement for last case in switch
 -comparison_type_conv         # comparisons against null, 0, true, false, or an empty string allowing implicit type conversion (use === or !==)
 -inc_dec_within_stmt          # increment (++) and decrement (--) operators used as part of greater statement
 +useless_void                 # use of the void type may be unnecessary (void is always undefined)

lib/lexer.js

@@ -135,7 +135,6 @@
           break;
         default:
           return 0;
-          break;
       }
       this.line += count(string, '\n');
       return string.length;
@@ -378,7 +377,6 @@
               break;
             case '::':
               prev[0] = 'INDEX_PROTO';
-              break;
           }
         }
       }

lib/nodes.js

@@ -1596,7 +1596,6 @@
               return '--';
             default:
               return pvar < 0 ? ' -= ' + pvar.slice(1) : ' += ' + pvar;
-              break;
           }
         })();
       }
@@ -1666,6 +1665,9 @@
           code += idt1 + ("case " + (cond.compile(o, LEVEL_PAREN)) + ":\n");
         }
         code += block.compile(o, LEVEL_TOP) + '\n';
+        if (i === this.cases.length - 1 && !this.otherwise) {
+          break;
+        }
         _ref5 = block.expressions;
         for (_j = _ref5.length - 1; _j >= 0; _j--) {
           expr = _ref5[_j];
@@ -1678,7 +1680,7 @@
         }
       }
       if (this.otherwise) {
-        code += idt1 + ("default:\n" + (this.otherwise.compile(o, LEVEL_TOP)) + "\n" + idt2 + "break;\n");
+        code += idt1 + ("default:\n" + (this.otherwise.compile(o, LEVEL_TOP)) + "\n");
       }
       return code + this.tab + '}';
     };

src/nodes.coffee

@@ -1367,10 +1367,11 @@ exports.Switch = class Switch extends Base
         cond  = cond.invert() unless @subject
         code += idt1 + "case #{ cond.compile o, LEVEL_PAREN }:\n"
       code += block.compile(o, LEVEL_TOP) + '\n'
+      break if i is @cases.length - 1 and not @otherwise
       for expr in block.expressions by -1 when expr not instanceof Comment
         code += idt2 + 'break;\n' unless expr instanceof Return
         break
-    code += idt1 + "default:\n#{ @otherwise.compile o, LEVEL_TOP }\n#{idt2}break;\n" if @otherwise
+    code += idt1 + "default:\n#{ @otherwise.compile o, LEVEL_TOP }\n" if @otherwise
     code +  @tab + '}'
 
 #### If