[Refactor] remove unused code

Author: ljharb

example/throw.js

@@ -1,4 +1,5 @@
-var falafel = require('falafel');
+'use strict';
+
 var test = require('../');
 
 test('throw', function (t) {

index.js

@@ -11,11 +11,6 @@ var canExit = typeof process !== 'undefined' && process
     && typeof process.exit === 'function'
 ;
 
-var nextTick = typeof setImmediate !== 'undefined'
-    ? setImmediate
-    : process.nextTick
-;
-
 exports = module.exports = (function () {
     var harness;
     var lazyLoad = function () {
@@ -100,8 +95,6 @@ exports.Test = Test;
 exports.test = exports; // tap compat
 exports.test.skip = Test.skip;
 
-var exitInterval;
-
 function createHarness(conf_) {
     if (!conf_) conf_ = {};
     var results = createResult();