build: add commonJS preprocessing for UMD build generation

Author: NoNameProvided

package-lock.json

@@ -43,6 +43,7 @@
     "validator": "^13.1.1"
   },
   "devDependencies": {
+    "@rollup/plugin-commonjs": "^14.0.0",
     "@rollup/plugin-node-resolve": "^8.4.0",
     "@types/jest": "^26.0.8",
     "@types/node": "^14.0.27",

package.json

@@ -1,4 +1,5 @@
 import { nodeResolve } from '@rollup/plugin-node-resolve';
+import commonjs from '@rollup/plugin-commonjs';
 import { terser } from 'rollup-plugin-terser';
 
 export default {
@@ -18,5 +19,5 @@ export default {
       plugins: [terser()],
     },
   ],
-  plugins: [nodeResolve()],
+  plugins: [commonjs(), nodeResolve()],
 };