fix: fix cjs build (for now) by adding var window

Author: pimlie

scripts/rollup.config.js

@@ -48,6 +48,7 @@ export default [{
   output: {
     ...baseConfig.output,
     file: pkg.main,
+    intro: 'var window',
     format: 'cjs'
   },
   external: Object.keys(pkg.dependencies)