storybook/docs/_snippets/svelte-webpack5-add-framework.md

export default {
  // ...
  framework: '@storybook/svelte-webpack5', // 👈 Add this
};

import { StorybookConfig } from '@storybook/svelte-webpack5';

const config: StorybookConfig = {
  // ...
  framework: '@storybook/svelte-webpack5', // 👈 Add this
};

export default config;