diff --git a/.changeset/eighty-trees-behave.md b/.changeset/eighty-trees-behave.md
new file mode 100644
index 00000000..77780f85
--- /dev/null
+++ b/.changeset/eighty-trees-behave.md
@@ -0,0 +1,5 @@
+---
+'@ice/pkg': major
+---
+
+feat: change polyfill default to none [BREAK]
diff --git a/packages/pkg/src/core/init.ts b/packages/pkg/src/core/init.ts
index 91fb1e07..5c9a192a 100644
--- a/packages/pkg/src/core/init.ts
+++ b/packages/pkg/src/core/init.ts
@@ -22,7 +22,6 @@ const defaultBundleUserConfig: BundleUserConfig = {
     js: defaultMinifyFunction,
     css: defaultMinifyFunction,
   },
-  polyfill: 'usage',
   compileDependencies: false,
 };
 
diff --git a/packages/pkg/src/rollupPlugins/swc.ts b/packages/pkg/src/rollupPlugins/swc.ts
index 9c7eec6c..b3d79f7a 100644
--- a/packages/pkg/src/rollupPlugins/swc.ts
+++ b/packages/pkg/src/rollupPlugins/swc.ts
@@ -97,7 +97,7 @@ async function transformImport(source: string, sourceFilename: string) {
     }
     if (targetImport.n.startsWith('@swc/helpers')) {
       if (!isESM) {
-        // Replace @swc/helpers with cjs path.
+        // Replace @swc/helpers with cjs
         const importStr = source.substring(targetImport.ss, targetImport.se);
         // Import rule: import { _ as _type_of } from "@swc/helpers/_/_type_of";
         const matchImport = importStr.match(/import\s+{\s+([\w*\s{},]*)\s+}\s+from\s+['"](.*)['"]/);
@@ -107,6 +107,12 @@ async function transformImport(source: string, sourceFilename: string) {
           str().overwrite(targetImport.ss, targetImport.se, replaceModule);
         }
       }
+    } else if (targetImport.n.startsWith('core-js')) {
+      // Replace core-js with cjs
+      if (!isESM) {
+        const replaceRequire = `require('${targetImport.n}')`;
+        str().overwrite(targetImport.ss, targetImport.se, replaceRequire);
+      }
     }
   });
 
diff --git a/packages/pkg/src/types.ts b/packages/pkg/src/types.ts
index 3fa3ef6b..f1a5509f 100644
--- a/packages/pkg/src/types.ts
+++ b/packages/pkg/src/types.ts
@@ -125,10 +125,8 @@ export interface BundleUserConfig {
       };
 
   /**
-   * Weather or not add the polyfill to the code.
-   * @default ['usage']
-   *
-   * In the next version(v2), the value of polyfill will be `false`.
+   * Weather or not add the polyfill(core-js) to the code.
+   * `undefined` is equivalent to `false`
    */
   polyfill?: false | 'entry' | 'usage';
 
diff --git a/packages/pkg/tests/core/initContextTasks.test.ts b/packages/pkg/tests/core/init.test.ts
similarity index 99%
rename from packages/pkg/tests/core/initContextTasks.test.ts
rename to packages/pkg/tests/core/init.test.ts
index f81dee10..d8c58de9 100644
--- a/packages/pkg/tests/core/initContextTasks.test.ts
+++ b/packages/pkg/tests/core/init.test.ts
@@ -402,7 +402,7 @@ describe('initTask', () => {
     });
 
     describe.each<[key: keyof BundleUserConfig, defaultValue: any, validValues: any[]]>([
-      ['polyfill', 'usage', [false, 'usage', 'entry']],
+      ['polyfill', undefined, [false, 'usage', 'entry']],
       ['compileDependencies', false, [false, true, ['react']]],
       ['externals', undefined, [false, { react: 'React' }]],
       ['browser', undefined, [false, true]],