storybook/docs/_snippets/main-config-babel.md

export default {
  // Replace your-framework with the framework you are using (e.g., react-webpack5, vue3-vite)
  framework: '@storybook/your-framework',
  stories: ['../src/**/*.mdx', '../stories/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
  async babel(config, { configType }) {
    if (configType === 'DEVELOPMENT') {
      // Your development configuration goes here
    }
    if (configType === 'PRODUCTION') {
      // Your production configuration goes here.
    }
    return config;
  },
};

// Replace your-framework with the framework you are using (e.g., react-webpack5, vue3-vite)
import type { StorybookConfig } from '@storybook/your-framework';

const config: StorybookConfig = {
  framework: '@storybook/your-framework',
  stories: ['../src/**/*.mdx', '../stories/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
  async babel(config, { configType }) {
    if (configType === 'DEVELOPMENT') {
      // Your development configuration goes here
    }
    if (configType === 'PRODUCTION') {
      // Your production configuration goes here.
    }
    return config;
  },
};

export default config;