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node_modules/xhr-response/index.js

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+'use strict';
+
+/**
+ * Safely access the response body.
+ *
+ * @param {XHR} xhr XHR request who's body we need to safely extract.
+ * @returns {Mixed} The response body.
+ * @api public
+ */
+module.exports = function get(xhr) {
+  if (xhr.response) return xhr.response;
+
+  var type = xhr.responseType || '';
+
+  //
+  // Browser bugs:
+  //
+  // IE<10:   Accessing binary data's responseText will throw an Exception
+  // Chrome:  When responseType is set to Blob it will throw errors even when
+  //          Accessing the responseText property.
+  //
+  // Firefox: An error is thrown when reading the `responseText` after unload
+  //          when responseType is using a `moz-chunked-*` type.
+  //          https://bugzilla.mozilla.org/show_bug.cgi?id=687087
+  //
+  if (~type.indexOf('moz-chunked') && xhr.readyState === 4) return;
+  if ('blob' !== type && 'string' === typeof xhr.responseText) {
+    return xhr.responseText || xhr.responseXML;
+  }
+};