Also support older browsers

Author: ahocevar

package-lock.json

@@ -40,7 +40,7 @@
   },
   "devDependencies": {
     "@babel/core": "^7.8.7",
-    "@babel/plugin-transform-runtime": "^7.16.7",
+    "@babel/plugin-transform-runtime": "^7.16.10",
     "@babel/preset-env": "^7.10.2",
     "@babel/register": "^7.8.6",
     "@rollup/plugin-babel": "^5.3.0",

package.json

@@ -1,5 +1,6 @@
 import resolve from '@rollup/plugin-node-resolve';
 import commonjs from '@rollup/plugin-commonjs';
+import { babel } from '@rollup/plugin-babel';
 import { terser } from 'rollup-plugin-terser';
 
 export default {
@@ -15,6 +16,19 @@ export default {
   plugins: [
     resolve({ browser: true }),
     commonjs(),
+    babel({
+      babelHelpers: 'runtime',
+      presets: [
+        [
+          '@babel/preset-env',
+          {
+            modules: false,
+            targets: 'last 2 versions, not dead',
+          },
+        ],
+      ],
+      plugins: ['@babel/plugin-transform-runtime'],
+    }),
     terser(),
   ],
 };