Fix storybook issue when importing local modules

reference: storybookjs/storybook#11255 (comment)

Author: acusti

Diff for: packages/docs/.storybook/main.js

@@ -1,4 +1,10 @@
+const path = require('path');
+
 module.exports = {
     stories: ['../stories/**/*.stories.mdx', '../stories/**/*.stories.@(js|jsx|ts|tsx)'],
     addons: ['@storybook/addon-links', '@storybook/addon-essentials'],
+    webpackFinal: (config, { configType }) => {
+        config.resolve.alias['core-js'] = path.dirname(require.resolve('core-js'));
+        return config;
+    },
 };