Update polyfill for eslint no-unwanted-polyfillio rule

packages/eslint-plugin-next/lib/rules/no-unwanted-polyfillio.js

@@ -1,3 +1,4 @@
+// Keep in sync with next.js polyfills file : https://github.com/vercel/next.js/blob/master/packages/next-polyfill-nomodule/src/index.js
 const NEXT_POLYFILLED_FEATURES = [
   'Array.prototype.@@iterator',
   'Array.prototype.copyWithin',
@@ -20,7 +21,11 @@ const NEXT_POLYFILLED_FEATURES = [
   'Number.isSafeInteger',
   'Number.MAX_SAFE_INTEGER',
   'Number.MIN_SAFE_INTEGER',
+  'Number.parseFloat',
+  'Number.parseInt',
+  'Object.assign',
   'Object.entries',
+  'Object.fromEntries',
   'Object.getOwnPropertyDescriptor',
   'Object.getOwnPropertyDescriptors',
   'Object.is',
@@ -42,21 +47,21 @@ const NEXT_POLYFILLED_FEATURES = [
   'String.prototype.startsWith',
   'String.prototype.trimEnd',
   'String.prototype.trimStart',
-  'String.prototype.trim',
   'URL',
+  'URL.prototype.toJSON',
   'URLSearchParams',
   'WeakMap',
   'WeakSet',
   'Promise',
   'Promise.prototype.finally',
   'es2015', // Should be covered by babel-preset-env instead.
-  'es2016', // Should be covered by babel-preset-env instead.
-  'es2017', // Should be covered by babel-preset-env instead.
-  'es2018', // Should be covered by babel-preset-env instead.
-  'es2019', // Should be covered by babel-preset-env instead.
+  'es2016', // contains polyfilled 'Array.prototype.includes', 'String.prototype.padEnd' and 'String.prototype.padStart'
+  'es2017', // contains polyfilled 'Object.entries', 'Object.getOwnPropertyDescriptors', 'Object.values', 'String.prototype.padEnd' and 'String.prototype.padStart'
+  'es2018', // contains polyfilled 'Promise.prototype.finally' and ''Symbol.asyncIterator'
+  'es2019', // Contains polyfilled 'Object.fromEntries' and polyfilled 'Array.prototype.flat', 'Array.prototype.flatMap', 'String.prototype.trimEnd' and 'String.prototype.trimStart'
   'es5', // Should be covered by babel-preset-env instead.
   'es6', // Should be covered by babel-preset-env instead.
-  'es7', // Should be covered by babel-preset-env instead.
+  'es7', // contains polyfilled 'Array.prototype.includes', 'String.prototype.padEnd' and 'String.prototype.padStart'
 ]
 
 const url = 'https://nextjs.org/docs/messages/no-unwanted-polyfillio'

packages/next-polyfill-nomodule/src/index.js

@@ -1,4 +1,5 @@
 /* eslint-disable import/no-extraneous-dependencies */
+// Keep in sync with eslint no-unwanted-polyfillio rule: https://github.com/vercel/next.js/blob/master/packages/eslint-plugin-next/lib/rules/no-unwanted-polyfillio.js
 import 'core-js/features/array/copy-within'
 import 'core-js/features/array/fill'
 import 'core-js/features/array/find'

test/unit/eslint-plugin-next/no-unwanted-polyfillio.test.ts

@@ -111,5 +111,25 @@ ruleTester.run('unwanted-polyfillsio', rule, {
         },
       ],
     },
+    {
+      code: `import {Head} from 'next/document';
+
+        export class ES2019Features extends Head {
+          render() {
+            return (
+              <div>
+                <h1>Hello title</h1>
+                <script src='https://polyfill.io/v3/polyfill.min.js?features=Object.fromEntries'></script>
+              </div>
+            );
+          }
+      }`,
+      errors: [
+        {
+          message:
+            'No duplicate polyfills from Polyfill.io are allowed. Object.fromEntries is already shipped with Next.js. See: https://nextjs.org/docs/messages/no-unwanted-polyfillio',
+        },
+      ],
+    },
   ],
 })