fix: Need regex replace, not string

Author: rschristian

src/index.js

@@ -248,7 +248,7 @@ export default class OptimizePlugin {
   async generatePolyfillsChunk (polyfills, cwd, timings) {
     const ENTRY = '\0entry';
 
-    const entryContent = polyfills.reduce((str, p) => `${str}\nimport "${p.replace('.js$', '')}";`, '');
+    const entryContent = polyfills.reduce((str, p) => `${str}\nimport "${p.replace(/\.js$/, '')}";`, '');
 
     const COREJS = require.resolve('core-js/package.json').replace('package.json', '');
     const isCoreJsPath = /(?:^|\/)core-js\/(.+)$/;