recent @vue/cli-service needs a workaround

Cf vuejs/vue-cli#4557 (comment)

Author: prigaux

app/package.json

@@ -28,7 +28,7 @@
     "@types/mocha": "^5.2.4",
     "@vue/cli-plugin-typescript": "^3.4.1",
     "@vue/cli-plugin-unit-mocha": "^3.4.1",
-    "@vue/cli-service": "^3.4.0",
+    "@vue/cli-service": "^3.11.0",
     "@vue/test-utils": "^1.0.0-beta.20",
     "autoprefixer": "^9.5.0",
     "chai": "^4.2.0",

app/vue.config.js

@@ -1,8 +1,10 @@
 module.exports = {
   runtimeCompiler: true,
   publicPath: "/",
-  // workaround for https://github.com/vuejs/vue-cli/issues/3898
   chainWebpack: config => {
+    // workaround for https://github.com/vuejs/vue-cli/issues/3898
     config.resolve.extensions.prepend('.ts')
+    // workaround for https://github.com/vuejs/vue-cli/issues/4557#issuecomment-532805642
+    config.plugins.delete('progress')
   },
 }