fix: add fallback to transform cache directory (#361)

Author: evilebottnawi

package-lock.json

@@ -55,17 +55,16 @@
   "devDependencies": {
     "@babel/cli": "^7.1.5",
     "@babel/core": "^7.1.6",
-    "@babel/polyfill": "^7.0.0",
     "@babel/preset-env": "^7.1.6",
     "@commitlint/cli": "^7.5.2",
     "@commitlint/config-conventional": "^7.5.0",
     "@webpack-contrib/defaults": "^3.0.5",
     "@webpack-contrib/eslint-config-webpack": "^3.0.0",
     "babel-jest": "^24.1.0",
     "cross-env": "^5.1.3",
-    "del": "^3.0.0",
+    "del": "^4.0.0",
     "del-cli": "^1.1.0",
-    "enhanced-resolve": "^3.4.1",
+    "enhanced-resolve": "^4.1.0",
     "eslint": "^5.13.0",
     "eslint-plugin-import": "^2.8.0",
     "eslint-plugin-prettier": "^3.0.0",
@@ -94,8 +93,7 @@
         {
           "targets": {
             "node": "6.9.0"
-          },
-          "useBuiltIns": "usage"
+          }
         }
       ]
     ]

package.json

@@ -1,5 +1,5 @@
 import path from 'path';
-
+import os from 'os';
 import crypto from 'crypto';
 
 import loaderUtils from 'loader-utils';
@@ -53,9 +53,10 @@ export default function postProcessPattern(globalRef, pattern, file) {
 
           if (pattern.cache) {
             if (!globalRef.cacheDir) {
-              globalRef.cacheDir = findCacheDir({
-                name: 'copy-webpack-plugin',
-              });
+              globalRef.cacheDir =
+                findCacheDir({
+                  name: 'copy-webpack-plugin',
+                }) || os.tmpdir();
             }
 
             const cacheKey = pattern.cache.key