diff --git a/lib/index.js b/lib/index.js
index 131c102..7c8937c 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -7,6 +7,7 @@ var fs = require('fs')
 const tsNodeVersion = require('ts-node').VERSION
 var tsVersion = require('typescript').version
 
+let didInit = false;
 module.exports = function(script, scriptArgs, nodeArgs, opts) {
   if (typeof script !== 'string' || script.length === 0) {
     throw new TypeError('`script` must be a string')
@@ -29,7 +30,11 @@ module.exports = function(script, scriptArgs, nodeArgs, opts) {
   var log = require('./log')(cfg)
   var notify = require('./notify')(cfg, log)
   opts.log = log
-  compiler.init(opts)
+
+  if (!didInit) {
+    compiler.init(opts)
+    didInit = true;
+  }
 
   compiler.notify = notify
   compiler.stop = stop
@@ -173,6 +178,11 @@ module.exports = function(script, scriptArgs, nodeArgs, opts) {
   })
 
   start()
+
+  return function dispose() {
+    stop();
+    watcher.removeAll();
+  }
 }
 
 /**