docs: set vuepress mode to develop to work around terser bug

docs/.vuepress/config.js

@@ -120,4 +120,10 @@ module.exports = {
     ['meta', { name: 'twitter:card', content: 'summary' }],
     ['meta', { name: 'twitter:title', content: 'Open Web Components' }],
   ],
+  // temporary set to develop mode as Terser seems to have a problem :/
+  configureWebpack: (config, isServer) => {
+    if (!isServer) {
+      config.mode = 'development';
+    }
+  },
 };

package.json

@@ -32,6 +32,7 @@
     "@commitlint/config-conventional": "7.1.2",
     "@commitlint/config-lerna-scopes": "7.2.1",
     "@vuepress/plugin-google-analytics": "^1.0.0-alpha.30",
+    "eslint": "^5.13.0",
     "eslint-config-prettier": "^3.3.0",
     "husky": "1.1.2",
     "lerna": "3.4.3",