fix: revert #61, fix #63

Author: antfu

lib/index.esm.mjs lib/index.esm.js

@@ -8,11 +8,11 @@
   "main": "lib/index.cjs.js",
   "jsdelivr": "lib/index.iife.js",
   "unpkg": "lib/index.iife.js",
-  "module": "lib/index.esm.mjs",
+  "module": "lib/index.esm.js",
   "types": "lib/index.d.ts",
   "exports": {
     ".": {
-      "import": "./lib/index.esm.mjs",
+      "import": "./lib/index.esm.js",
       "require": "./lib/index.cjs.js"
     },
     "./": "./"

lib/v2/index.esm.mjs lib/v2/index.esm.js

@@ -30,7 +30,7 @@ function updateVue2API() {
 
   const exports = Object.keys(VCA).filter(i => !ignoreList.includes(i))
 
-  const esmPath = path.join(dir, 'index.esm.mjs')
+  const esmPath = path.join(dir, 'index.esm.js')
   let content = fs.readFileSync(esmPath, 'utf-8')
 
   content = content.replace(
@@ -46,7 +46,7 @@ export { ${exports.join(', ')} } from '@vue/composition-api'
 
 function switchVersion(version, vue) {
   copy('index.cjs.js', version, vue)
-  copy('index.esm.mjs', version, vue)
+  copy('index.esm.js', version, vue)
   copy('index.d.ts', version, vue)
 
   if (version === 2)