From d13996e9a16bcb32c9b13e45cf8c1a661e6f8e6c Mon Sep 17 00:00:00 2001
From: Patrick Cavanaugh <pcavanaugh@vistaprint.com>
Date: Fri, 22 Sep 2017 10:58:04 -0400
Subject: [PATCH] Handle module.id being null

Fixes error "TypeError: Path must be a string. Received undefined" when
operating on minified output that had been processed by derequire, e.g.

  {
    id: undefined,
    source: '"use strict";var Promise=_dereq_("./promise.js")();module.exports=Promise',
    deps: {
      './promise.js': '/Users/username/src/myproject/core/node_modules/bluebird/js/main/promise.js'
    }
  }
---
 index.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/index.js b/index.js
index 1accf5e..e6cfe04 100644
--- a/index.js
+++ b/index.js
@@ -255,7 +255,7 @@ function values(object) {
 }
 
 function isEmpty(module) {
-  return (
+  return module.id === undefined || (
     path.basename(module.id) === '_empty.js' &&
   (!fs.existsSync(module.id) || !fs.statSync(module.id).size)
   )