storybook/docs/_snippets/main-config-addons.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', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
  addons: [
    '@storybook/addon-essentials',
    {
      name: '@storybook/addon-styling-webpack',
      options: {
        rules: [
          {
            test: /\.css$/,
            use: [
              'style-loader',
              'css-loader',
              {
                loader: 'postcss-loader',
                options: {
                  implementation: require.resolve('postcss'),
                },
              },
            ],
          },
        ],
      },
    },
  ],
};

// 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', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'],
  addons: [
    '@storybook/addon-essentials',
    {
      name: '@storybook/addon-styling-webpack',
      options: {
        rules: [
          {
            test: /\.css$/,
            use: [
              'style-loader',
              'css-loader',
              {
                loader: 'postcss-loader',
                options: {
                  implementation: require.resolve('postcss'),
                },
              },
            ],
          },
        ],
      },
    },
  ],
};

export default config;