Merge pull request #1506 from zloirock/v4-rd

Rework `@core-js/builder`

Author: zloirock

.github/workflows/ci.yml

@@ -50,9 +50,8 @@ jobs:
     strategy:
       matrix:
         node:
-          - 20.9
-          - 21
-          - ^22.5.1
+          - ^20.19
+          - ^22.12
           - 23
           - 24
           - 25
@@ -74,9 +73,8 @@ jobs:
           - windows-latest
           - macos-latest
         node:
-          - 20.9
-          - 21
-          - ^22.5.1
+          - ^20.19
+          - ^22.12
           - 23
           - 24
           - 25

.gitignore

@@ -24,6 +24,7 @@ node_modules/
 /packages/core-js/LICENSE
 /packages/core-js-babel-plugin/LICENSE
 /packages/core-js-builder/LICENSE
+/packages/core-js-builder/__tmp__/
 /packages/core-js-bundle/LICENSE
 /packages/core-js-bundle/index.js
 /packages/core-js-bundle/minified.js

package-lock.json

@@ -32,6 +32,6 @@
     "@core-js/compat": "4.0.0-alpha.0"
   },
   "engines": {
-    "node": ">=20.19.0"
+    "node": "^20.19.0 || >=22.12.0"
   }
 }

packages/core-js-babel-plugin/package.json

@@ -1,3 +1,4 @@
 node_modules/
+__tmp__/
 *.log
 .*

packages/core-js-builder/.npmignore

@@ -31,6 +31,8 @@ const { script } = await builder({
   // output format, 'bundle' by default, can be 'cjs' or 'esm', and in this case
   // the result will not be bundled and will contain imports of required modules
   format: 'bundle',
+  // minify the output in the case of format: bundle, `true` by default
+  minify: true,
   // optional target filename, if it's missed a file will not be created
   filename: PATH_TO_MY_COREJS_BUNDLE,
 });

packages/core-js-builder/README.md

@@ -0,0 +1,59 @@
+const version = '4.0.0-alpha.0';
+
+/* eslint-disable prefer-template -- for better formatting */
+export const banner = '/**\n' +
+                      ' * core-js ' + version + '\n' +
+                      ' * © 2013–2025 Denis Pushkarev (zloirock.ru), 2025–2026 CoreJS Company (core-js.io). All rights reserved.\n' +
+                      ' * license: https://github.com/zloirock/core-js/blob/v' + version + '/LICENSE\n' +
+                      ' * source: https://github.com/zloirock/core-js\n' +
+                      ' */';
+/* eslint-enable prefer-template -- for better formatting */
+
+export function getRolldownOptions(input, output) {
+  return {
+    input,
+    platform: 'neutral',
+    treeshake: false,
+    output: {
+      externalLiveBindings: false,
+      format: 'iife',
+      file: output,
+      keepNames: true,
+      minifyInternalExports: true,
+    },
+  };
+}
+
+export const ModernSyntax = [
+  'arrow-functions',
+  'shorthand-properties',
+];
+
+export const MinifyOptions = {
+  minify: true,
+  jsc: {
+    minify: {
+      compress: {
+        arrows: false,
+        ecma: 5,
+        hoist_funs: true,
+        keep_fnames: true,
+        pure_getters: true,
+        reduce_funcs: true,
+        // document.all detection case
+        typeofs: false,
+        unsafe_proto: true,
+        unsafe_undefined: true,
+      },
+      mangle: {
+        keep_fnames: true,
+        safari10: true,
+        toplevel: true,
+      },
+      format: {
+        comments: false,
+        ecma: 5,
+      },
+    },
+  },
+};

packages/core-js-builder/config.js

@@ -22,6 +22,8 @@ type Options = Pick<CompatOptions, "exclude" | "modules" | "targets"> & {
   format?: Format,
   /** optional target filename, if it's missed a file will not be created */
   filename?: string,
+  /** minify the output in the case of format: bundle, `true` by default */
+  minify?: boolean,
   /** shows summary for the bundle, disabled by default */
   summary?: Summary,
 };