Import upstream changes (497422780bb061bae3585579dcf842c2b411e5fb)

rollup.config.js

@@ -5,7 +5,7 @@
  */
 
 import summary from 'rollup-plugin-summary';
-import {terser} from 'rollup-plugin-terser';
+import terser from '@rollup/plugin-terser';
 import resolve from '@rollup/plugin-node-resolve';
 import replace from '@rollup/plugin-replace';
 
@@ -21,7 +21,7 @@ export default {
     }
   },
   plugins: [
-    replace({'Reflect.decorate': 'undefined'}),
+    replace({preventAssignment: false, 'Reflect.decorate': 'undefined'}),
     resolve(),
     /**
      * This minification setup serves the static site generation.