chore: drop xtend dependency

Spread in object literals is natively supported in Node.js since v8.3.0. Minimum version of Node.js supported by multer at the moment is v10.16.0, so we should be good to go.

Author: wojtekmaj

lib/make-middleware.js

@@ -1,6 +1,5 @@
 var is = require('type-is')
 var Busboy = require('busboy')
-var extend = require('xtend')
 var appendField = require('append-field')
 
 var Counter = require('./counter')
@@ -158,7 +157,7 @@ function makeMiddleware (setup) {
         storage._handleFile(req, file, function (err, info) {
           if (aborting) {
             appender.removePlaceholder(placeholder)
-            uploadedFiles.push(extend(file, info))
+            uploadedFiles.push({...file, ...info})
             return pendingWrites.decrement()
           }
 
@@ -168,7 +167,7 @@ function makeMiddleware (setup) {
             return abortWithError(err)
           }
 
-          var fileInfo = extend(file, info)
+          var fileInfo = {...file, ...info}
 
           appender.replacePlaceholder(placeholder, fileInfo)
           uploadedFiles.push(fileInfo)

package.json

@@ -27,8 +27,7 @@
     "busboy": "^1.6.0",
     "concat-stream": "^2.0.0",
     "object-assign": "^4.1.1",
-    "type-is": "^1.6.18",
-    "xtend": "^4.0.2"
+    "type-is": "^1.6.18"
   },
   "devDependencies": {
     "deep-equal": "^2.0.3",