Agregada dependencia necesaria para el build.

package.json

@@ -19,6 +19,7 @@
         "file-loader": "^6.0.0",
         "postcss-loader": "^3.0.0",
         "register-service-worker": "^1.6.2",
+        "thread-loader": "^2.1.3",
         "url-loader": "^4.1.0",
         "vue": "^2.6.6",
         "vue-analytics": "^5.16.4",

pnpm-lock.yaml

@@ -8,6 +8,7 @@ dependencies:
   file-loader: 6.0.0
   postcss-loader: 3.0.0
   register-service-worker: 1.7.1
+  thread-loader: 2.1.3
   url-loader: 4.1.0_file-loader@6.0.0
   vue: 2.6.11
   vue-analytics: 5.22.1
@@ -5411,7 +5412,6 @@ packages:
     resolution:
       integrity: sha1-lWkFcI1YtLq0wiYbBPWfMcmTdMA=
   /loader-runner/2.4.0:
-    dev: true
     engines:
       node: '>=4.3.0 <5.0.0 || >=5.10'
     resolution:
@@ -8561,6 +8561,18 @@ packages:
     dev: true
     resolution:
       integrity: sha1-5p44obq+lpsBCCB5eLn2K4hgSDk=
+  /thread-loader/2.1.3:
+    dependencies:
+      loader-runner: 2.4.0
+      loader-utils: 1.4.0
+      neo-async: 2.6.1
+    dev: false
+    engines:
+      node: '>= 6.9.0 <7.0.0 || >= 8.9.0'
+    peerDependencies:
+      webpack: ^2.0.0 || ^3.0.0 || ^4.0.0
+    resolution:
+      integrity: sha512-wNrVKH2Lcf8ZrWxDF/khdlLlsTMczdcwPA9VEK4c2exlEPynYWxi9op3nPTo5lAnDIkE0rQEB3VBP+4Zncc9Hg==
   /thread-loader/2.1.3_webpack@4.43.0:
     dependencies:
       loader-runner: 2.4.0
@@ -9738,6 +9750,7 @@ specifiers:
   pug-plain-loader: ^1.0.0
   register-service-worker: ^1.6.2
   sass-loader: ^7.1.0
+  thread-loader: ^2.1.3
   typescript: ^3.7.3
   url-loader: ^4.1.0
   vue: ^2.6.6