Use pirates for interoperability with other require hooks

package.json

@@ -40,6 +40,7 @@
  ],
  "dependencies": {
  "babylon": "^6.15.0",
+ "pirates": "^3.0.2",
  "vlq": "^0.2.1"
  },
  "engines": {

register.js

@@ -1,4 +1,5 @@
 var flowRemoveTypes = require('./index');
+var pirates = require('pirates');
 
 // Supported options:
 //
@@ -13,34 +14,20 @@ module.exports = function setOptions(newOptions) {
  options = newOptions;
 }
 
-// Swizzle Module#_compile on each applicable module instance.
-// NOTE: if using alongside Babel or another require-hook which simply
-// over-writes the require.extensions and does not continue execution, then
-// this require hook must come after it. Encourage those module authors to call
-// the prior loader in their require hooks.
 var jsLoader = require.extensions['.js'];
 var exts = [ '.js', '.mjs', '.jsx', '.flow', '.es6' ];
-exts.forEach(function (ext) {
- var superLoader = require.extensions[ext] || jsLoader;
- require.extensions[ext] = function (module, filename) {
- if (shouldTransform(filename, options)) {
- var super_compile = module._compile;
- module._compile = function _compile(code, filename) {
- try {
- var patched = flowRemoveTypes(code, options);
- }
- catch (e) {
- e.message = filename + ': ' + e.message;
- throw e;
- }
- super_compile.call(this, patched.toString(), filename);
- };
- }
- superLoader(module, filename);
- };
-});
 
-function shouldTransform(filename, options) {
+var revert = pirates.addHook(function hook(code, filename) {
+ try {
+ return flowRemoveTypes(code, options).toString();
+ }
+ catch (e) {
+ e.message = filename + ': ' + e.message;
+ throw e;
+ }
+}, { exts: exts, matcher: shouldTransform });
+
+function shouldTransform(filename) {
  var includes = options && regexpPattern(options.includes || options.include);
  var excludes =
  options && 'excludes' in options ? regexpPattern(options.excludes) :