Remove Babel from library build pipeline

The rollup build already uses @rollup/plugin-typescript for type
stripping and JSX. Babel was running after it as a no-op for modern
targets. Now Babel is only used by Jest for ESM→CJS conversion.

Also removes @babel/preset-env since it's no longer needed.
Bundle size decreased by ~1.7KB.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/webamp/.babelrc

@@ -1,33 +1,4 @@
 {
-  "presets": [
-    [
-      "@babel/preset-env",
-      {
-        "targets": {
-          "browsers": [
-            "last 2 Chrome versions",
-            "last 2 ChromeAndroid versions",
-            "last 2 Safari versions",
-            "last 2 Firefox versions",
-            "last 2 Edge versions",
-            "last 2 iOS versions",
-            "last 2 Opera versions"
-          ]
-        }
-      }
-    ],
-    // TODO: Can TypeScript just do this for us?
-    "@babel/preset-typescript"
-  ],
-  "plugins": [],
-  "env": {
-    "test": {
-      "plugins": [
-        "@babel/plugin-transform-modules-commonjs"
-      ]
-    },
-    "library": {
-      "plugins": ["@babel/plugin-transform-runtime"]
-    }
-  }
+  "presets": ["@babel/preset-typescript"],
+  "plugins": ["@babel/plugin-transform-modules-commonjs"]
 }

packages/webamp/package.json

@@ -75,8 +75,6 @@
     "ani-cursor": "workspace:*",
     "milkdrop-preset-converter-aws": "^0.1.6",
     "winamp-eqf": "workspace:*",
-    "@babel/preset-env": "^7.25.0",
-    "@rollup/plugin-babel": "^6.0.4",
     "@rollup/plugin-commonjs": "^25.0.8",
     "@rollup/plugin-json": "^6.1.0",
     "@rollup/plugin-node-resolve": "^15.2.3",

packages/webamp/scripts/rollupPlugins.mjs

@@ -8,7 +8,6 @@ import { visualizer } from "rollup-plugin-visualizer";
 import replace from "@rollup/plugin-replace";
 import postcssOptimizeDataUriPngs from "./postcss-optimize-data-uri-pngs.mjs";
 import atImport from "postcss-import";
-import { babel } from "@rollup/plugin-babel";
 import nodePolyfills from "rollup-plugin-polyfill-node";
 import path from "node:path";
 
@@ -55,14 +54,6 @@ export function getPlugins({ minify, outputFile, vite }) {
     // Without this we get: Error: 'default' is not exported by node_modules/react/index.js
     // because react-redux import react as if it were an es6 module, but it is not.
     commonjs(),
-    // Must come after commonjs
-    babel({
-      babelHelpers: "bundled",
-      compact: minify,
-      // Optimize Babel by excluding node_modules and only processing necessary files
-      exclude: ["node_modules/**"],
-      include: ["js/**/*"],
-    }),
     minify
       ? terser({
           compress: {

pnpm-lock.yaml

@@ -381,12 +381,6 @@ importers:
         specifier: ^1.2.3
         version: 1.2.3
     devDependencies:
-      '@babel/preset-env':
-        specifier: ^7.25.0
-        version: 7.27.2(@babel/core@7.27.4)
-      '@rollup/plugin-babel':
-        specifier: ^6.0.4
-        version: 6.0.4(@babel/core@7.27.4)(@types/babel__core@7.20.5)(rollup@4.18.0)
       '@rollup/plugin-commonjs':
         specifier: ^25.0.8
         version: 25.0.8(rollup@4.18.0)
@@ -3118,19 +3112,6 @@ packages:
     resolution: {integrity: sha512-GFGDywRwGbuGq9yeL8wTjjLOsZ5Ps4O5tQ71eDcAfaZrZeA7Oe8QJzrnmFgplWtnoaBIBaFBB3n5Ht9iU4jLLw==}
     engines: {node: '>=12.0.0'}
 
-  '@rollup/plugin-babel@6.0.4':
-    resolution: {integrity: sha512-YF7Y52kFdFT/xVSuVdjkV5ZdX/3YtmX0QulG+x0taQOtJdHYzVU61aSSkAgVJ7NOv6qPkIYiJSgSWWN/DM5sGw==}
-    engines: {node: '>=14.0.0'}
-    peerDependencies:
-      '@babel/core': ^7.0.0
-      '@types/babel__core': ^7.1.9
-      rollup: ^1.20.0||^2.0.0||^3.0.0||^4.0.0
-    peerDependenciesMeta:
-      '@types/babel__core':
-        optional: true
-      rollup:
-        optional: true
-
   '@rollup/plugin-commonjs@16.0.0':
     resolution: {integrity: sha512-LuNyypCP3msCGVQJ7ki8PqYdpjfEkE/xtFa5DqlF+7IBD0JsfMZ87C58heSwIMint58sAUZbt3ITqOmdQv/dXw==}
     engines: {node: '>= 8.0.0'}
@@ -16745,17 +16726,6 @@ snapshots:
 
   '@rgrove/parse-xml@3.0.0': {}
 
-  '@rollup/plugin-babel@6.0.4(@babel/core@7.27.4)(@types/babel__core@7.20.5)(rollup@4.18.0)':
-    dependencies:
-      '@babel/core': 7.27.4
-      '@babel/helper-module-imports': 7.27.1
-      '@rollup/pluginutils': 5.1.0(rollup@4.18.0)
-    optionalDependencies:
-      '@types/babel__core': 7.20.5
-      rollup: 4.18.0
-    transitivePeerDependencies:
-      - supports-color
-
   '@rollup/plugin-commonjs@16.0.0(rollup@2.37.1)':
     dependencies:
       '@rollup/pluginutils': 3.1.0(rollup@2.37.1)