Update dependencies and improve build system

service/config/terserOptions.js

@@ -0,0 +1,42 @@
+'use strict'
+
+module.exports = (options) => ({
+  terserOptions: {
+    compress: {
+      // turn off flags with small gains to speed up minification
+      arrows: false,
+      collapse_vars: false, // 0.3kb
+      comparisons: false,
+      computed_props: false,
+      hoist_funs: false,
+      hoist_props: false,
+      hoist_vars: false,
+      inline: false,
+      loops: false,
+      negate_iife: false,
+      properties: false,
+      reduce_funcs: false,
+      reduce_vars: false,
+      switches: false,
+      toplevel: false,
+      typeofs: false,
+
+      // a few flags with noticable gains/speed ratio
+      // numbers based on out of the box vendor bundle
+      booleans: true, // 0.7kb
+      if_return: true, // 0.4kb
+      sequences: true, // 0.7kb
+      unused: true, // 2.3kb
+
+      // required features to drop conditional branches
+      conditionals: true,
+      dead_code: true,
+      evaluate: true,
+    },
+    mangle: {
+      safari10: true,
+    },
+  },
+  // parallel: options.parallel,
+  extractComments: false,
+})