build: babel output for package building

babel.config.js

@@ -1,10 +1,11 @@
 // the file is used for jest testing & site building
+// > 2%, make template string not compiled to concat, since it's not fast
 module.exports = {
   presets: [
     [
       '@babel/preset-env',
       {
-        targets: 'defaults, not IE 11'
+        targets: '>2%, not IE 11'
       }
     ]
   ]

package.json

@@ -58,7 +58,7 @@
     ]
   },
   "devDependencies": {
-    "@babel/preset-env": "^7.12.7",
+    "@babel/preset-env": "^7.12.10",
     "@rollup/plugin-babel": "^5.2.2",
     "@rollup/plugin-node-resolve": "^10.0.0",
     "@rollup/plugin-replace": "^2.3.4",

rollup.config.js

@@ -2,9 +2,10 @@ const cssRenderPlugin = require('./build/rollup-plugin-css-render')
 const { nodeResolve } = require('@rollup/plugin-node-resolve')
 const { terser } = require('rollup-plugin-terser')
 const replace = require('@rollup/plugin-replace')
+const { babel } = require('@rollup/plugin-babel')
 
 function externalValidator (patterns) {
-  return id => patterns.some(pattern => id.startsWith(pattern))
+  return (id) => patterns.some((pattern) => id.startsWith(pattern))
 }
 
 // do not use babel when build library, use it when only build the site
@@ -31,6 +32,9 @@ module.exports = {
       extensions: ['.js', '.json']
     }),
     cssRenderPlugin(),
+    babel({
+      babelHelpers: 'bundled'
+    }),
     terser({
       mangle: false,
       output: {