> **Version 8** — **React** / **TypeScript** > Also available: - `?language=js` for JavaScript - `?codeOnly=true` for code snippets only - other versions: Version 10.3 (latest) (`/docs/api/main-config/main-config-manager-head.md`), Version 9 (`/docs/9/api/main-config/main-config-manager-head.md`) # managerHead Parent: [main.js|ts configuration](./main-config.mdx) Type: `(head: string) => string` Programmatically adjust the manager's `` of your Storybook. For example, load a custom font or add a script. Most often used by [addon authors](../../addons/writing-presets.mdx#ui-configuration). If you don't need to programmatically adjust the manager head, you can add scripts and styles to `manager-head.html` instead. For example, you can conditionally add scripts or styles, depending on the environment: ```ts // .storybook/main.ts // Replace your-framework with the framework you are using (e.g., react-webpack5, vue3-vite) const config: StorybookConfig = { framework: '@storybook/your-framework', stories: ['../src/**/*.mdx', '../src/**/*.stories.@(js|jsx|mjs|ts|tsx)'], managerHead: (head) => ` ${head} `, }; export default config; ```