---
title: "Next-generation module mocking in Storybook"
url: https://daily.dev/posts/next-generation-module-mocking-in-storybook-ab9gphmxo
source_url: https://storybook.js.org/blog/next-generation-module-mocking/
type: article
source: "Storybook"
published: 2025-08-21T18:02:20.384Z
updated: 2025-08-21T18:02:50.867Z
tags: ["testing", "typescript", "storybook", "vitest"]
reading_time: 6
upvotes: 5
comments: 0
language: en
---

> ## Documentation Index
> Fetch the complete documentation index at: https://daily.dev/llms.txt
> Use this file to discover all available pages before exploring further.

# Next-generation module mocking in Storybook

**[Storybook](https://daily.dev/sources/storybook)** · 6 min read · 5 upvotes · 0 comments

## Summary

Storybook 9.1 introduces a new module mocking system powered by sb.mock() that automatically mocks dependencies without requiring package.json changes or import path modifications. The system uses ahead-of-time transformation to rewrite dependency graphs before bundling, supporting both Vite and Webpack in development and production. It offers automocking, spying capabilities, __mocks__ directory support, and type-safe mocking with dynamic imports, providing a cleaner alternative to the previous subpath imports approach.

## Full article

daily.dev links to this article rather than hosting it. Read it at the original source: <https://storybook.js.org/blog/next-generation-module-mocking/>

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---

Tags: [#testing](https://daily.dev/tags/testing), [#typescript](https://daily.dev/tags/typescript), [#storybook](https://daily.dev/tags/storybook), [#vitest](https://daily.dev/tags/vitest)

[View this post on daily.dev](https://daily.dev/posts/next-generation-module-mocking-in-storybook-ab9gphmxo)