fix recorder when calling res.end(data)

lib/recorder.js

@@ -8,6 +8,7 @@ var debug = require('debug')('nock.recorder');
 var _ = require('lodash');
 var Stream = require('stream');
 var URL = require('url');
+var semver = require('semver')
 
 var SEPARATOR = '\n<<<<<<-- cut here -->>>>>>\n';
 var recordingInProgress = false;
@@ -340,6 +341,23 @@ function record(rec_options) {
       }
     };
 
+    // in Node 8, res.end() does not call res.write() directly
+    if (semver.satisfies(process.version, '>=8')) {
+      var oldEnd = req.end;
+      req.end = function(data, encoding, callback) {
+        if ('undefined' !== typeof(data)) {
+          if (data) {
+            debug(thisRecordingId, 'new', proto, 'body chunk');
+            if (! Buffer.isBuffer(data)) {
+              data = new Buffer(data, encoding);
+            }
+            bodyChunks.push(data);
+          }
+        }
+        oldEnd.apply(req, arguments);
+      };
+    }
+
     return req;
   });
 }

package.json

@@ -174,7 +174,8 @@
     "lodash": "~4.17.2",
     "mkdirp": "^0.5.0",
     "propagate": "0.4.0",
-    "qs": "^6.0.2"
+    "qs": "^6.0.2",
+    "semver": "^5.3.0"
   },
   "devDependencies": {
     "async": "^2.1.1",