[v5] drop es5 (#2380)

package.json

@@ -108,15 +108,8 @@
   },
   "homepage": "https://github.com/pmndrs/zustand",
   "devDependencies": {
-    "@babel/core": "^7.24.0",
-    "@babel/plugin-external-helpers": "^7.23.3",
-    "@babel/plugin-transform-react-jsx": "^7.23.4",
-    "@babel/plugin-transform-runtime": "^7.24.0",
-    "@babel/plugin-transform-typescript": "^7.23.6",
-    "@babel/preset-env": "^7.24.0",
     "@redux-devtools/extension": "^3.3.0",
     "@rollup/plugin-alias": "^5.1.0",
-    "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-node-resolve": "^15.2.3",
     "@rollup/plugin-replace": "^5.0.5",
     "@rollup/plugin-typescript": "^11.1.6",

rollup.config.js

@@ -1,6 +1,5 @@
 const path = require('path')
 const alias = require('@rollup/plugin-alias')
-const babelPlugin = require('@rollup/plugin-babel')
 const resolve = require('@rollup/plugin-node-resolve')
 const replace = require('@rollup/plugin-replace')
 const typescript = require('@rollup/plugin-typescript')
@@ -19,24 +18,9 @@ function external(id) {
   return !id.startsWith('.') && !id.startsWith(root)
 }
 
-function getBabelOptions(targets) {
+function getEsbuild(format) {
-  return {
-    babelrc: false,
-    ignore: ['./node_modules'],
-    presets: [['@babel/preset-env', { loose: true, modules: false, targets }]],
-    plugins: [
-      ['@babel/plugin-transform-react-jsx', { runtime: 'automatic' }],
-      ['@babel/plugin-transform-typescript', { isTSX: true }],
-    ],
-    extensions,
-    comments: false,
-    babelHelpers: 'bundled',
-  }
-}
-
-function getEsbuild(env = 'development') {
   return esbuild({
-    minify: env === 'production',
+    format,
     target: 'es2018',
     supported: { 'import-meta': true },
     tsconfig: path.resolve('./tsconfig.json'),
@@ -83,7 +67,7 @@ function createESMConfig(input, output) {
         delimiters: ['\\b', '\\b(?!(\\.|/))'],
         preventAssignment: true,
       }),
-      getEsbuild(),
+      getEsbuild('esm'),
     ],
   }
 }
@@ -91,11 +75,7 @@ function createESMConfig(input, output) {
 function createCommonJSConfig(input, output) {
   return {
     input,
-    output: {
+    output: { file: output, format: 'cjs' },
-      file: `${output}.js`,
-      format: 'cjs',
-      esModule: false,
-    },
     external,
     plugins: [
       alias({ entries: entries.filter((e) => !e.find.test(input)) }),
@@ -105,7 +85,7 @@ function createCommonJSConfig(input, output) {
         delimiters: ['\\b', '\\b(?!(\\.|/))'],
         preventAssignment: true,
       }),
-      babelPlugin(getBabelOptions({ ie: 11 })),
+      getEsbuild('cjs'),
     ],
   }
 }
@@ -119,8 +99,8 @@ module.exports = function (args) {
   }
   return [
     ...(c === 'index' ? [createDeclarationConfig(`src/${c}.ts`, 'dist')] : []),
-    createCommonJSConfig(`src/${c}.ts`, `dist/${c}`),
+    createCommonJSConfig(`src/${c}.ts`, `dist/${c}.js`),
-    createESMConfig(`src/${c}.ts`, `dist/esm/${c}.mjs`), // just for testing sed -e flag
+    createESMConfig(`src/${c}.ts`, `dist/esm/${c}.mjs`),
   ]
 }