storybook/docs/_snippets/main-config-vite-final-env.md

export default {
  stories: ['../src/**/*.mdx', '../stories/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
  core: {
    builder: '@storybook/builder-vite',
  },
  async viteFinal(config, { configType }) {
    const { mergeConfig } = await import('vite');

    if (configType === 'DEVELOPMENT') {
      // Your development configuration goes here
    }
    if (configType === 'PRODUCTION') {
      // Your production configuration goes here.
    }
    return mergeConfig(config, {
      // Your environment configuration here
    });
  },
};