@storybook/addon-svelte-csf/dist/parser/extract/svelte/story/template.js

Allows to write stories in Svelte syntax

/**
 * Extract the {@link SnippetBlock}  of the individual `<Story />` if exists.
 *
 * This AST node will help us in the further transformation of the `parameters.docs.source.code` on the compiled code,
 * and at runtime.
 */
export function extractStoryTemplateSnippetBlock(component) {
    const { fragment } = component;
    const { nodes } = fragment;
    return nodes.find((node) => node.type === 'SnippetBlock' && node.expression.name === 'template');
}