Build: Fix MCP tests on Windows by valentinpalkovic · Pull Request #33644 · storybookjs/storybook

valentinpalkovic · 2026-01-26T10:07:48Z

Closes #

What I did

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

stories
unit tests
integration tests
end-to-end tests

Manual testing

Caution

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

Add or update documentation reflecting your changes
If you are deprecating/removing a feature, make sure to update
MIGRATION.MD

Checklist for Maintainers

When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts
Make sure this PR contains one of the labels below:
Available labels
- bug: Internal changes that fixes incorrect behavior.
- maintenance: User-facing maintenance tasks.
- dependencies: Upgrading (sometimes downgrading) dependencies.
- build: Internal-facing build tooling & test updates. Will not show up in release changelog.
- cleanup: Minor cleanup style change. Will not show up in release changelog.
- documentation: Documentation only changes. Will not show up in release changelog.
- feature request: Introducing a new feature.
- BREAKING CHANGE: Changes that break compatibility in some way with current major version.
- other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook publish.yml --field pr=<PR_NUMBER>

Summary by CodeRabbit

Tests
- Improved cross-platform compatibility for end-to-end test suite.
- Enhanced path resolution to ensure consistent test execution across different operating systems.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

github-actions · 2026-01-26T10:08:09Z

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🚫	The "#### Manual testing" section must be filled in. Please describe how to test the changes you've made, step by step, so that reviewers can confirm your PR works as intended.

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nx-cloud · 2026-01-26T10:08:23Z

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nx-cloud · 2026-01-26T10:08:24Z

View your CI Pipeline Execution ↗ for commit 7a2871a

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coderabbitai · 2026-01-26T10:11:48Z

📝 Walkthrough

Walkthrough

An e2e test file is updated to use Node.js path module for constructing absolute story file paths instead of template literals, ensuring platform-agnostic path handling. A non-null assertion is also added to the sandboxDir variable.

Changes

Cohort / File(s)	Summary
Cross-platform path construction `code/e2e-tests/addon-mcp.spec.ts`	Added `node:path` import and refactored two absolute path constructions from template literals to `path.join()` for platform independence; applied non-null assertion to `sandboxDir`.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~8 minutes

Possibly related PRs

E2E: Update addon-mcp tests to match new tool name. #33630 — Modifies the same test file to introduce sandboxDir-based absolute story path construction, directly related to the path handling improvements in this PR.
Manifests and MCP: Add e2e tests #33514 — Updates the same e2e test file with changes that motivate the cross-platform path construction updates applied here.

✨ Finishing touches

📝 Generate docstrings

_{Comment @coderabbitai help to get the list of available commands and usage tips.}

coderabbitai

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@code/e2e-tests/addon-mcp.spec.ts`:
- Around line 8-11: Replace the non‑null asserted constant sandboxDir so it
fails fast with a clear message and provides the usual default; instead of using
process.env.STORYBOOK_SANDBOX_DIR! in the top‑level const, read the env var into
a variable, and if it is missing throw a descriptive Error (or set to the
default sandbox path "../storybook-sandboxes/" resolved to an absolute path)
before any path.join usage; update references to the existing sandboxDir
constant so code uses the validated/defaulted value and avoid later mysterious
path.join failures.

coderabbitai · 2026-01-26T10:11:51Z

 const storybookUrl = process.env.STORYBOOK_URL || 'http://localhost:8001';
 const templateName = process.env.STORYBOOK_TEMPLATE_NAME || '';
 const type = process.env.STORYBOOK_TYPE || 'dev';
-const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR;
+const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR!;


⚠️ Potential issue | 🟡 Minor

Avoid non‑null assertion for required env var; fail with a clear error.

process.env.STORYBOOK_SANDBOX_DIR! can throw later in path.join with a confusing error when the env var isn’t set. Prefer an explicit guard and a helpful message (including the default sandbox location) to make CI/local failures actionable.

✅ Suggested change

-const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR!; +const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR; +if (!sandboxDir) { + throw new Error( + 'STORYBOOK_SANDBOX_DIR is required. Sandboxes are generated outside the repo at ../storybook-sandboxes/.' + ); +}

Based on learnings, sandboxes default to ../storybook-sandboxes/.

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

const storybookUrl = process.env.STORYBOOK_URL || 'http://localhost:8001';

const templateName = process.env.STORYBOOK_TEMPLATE_NAME || '';

const type = process.env.STORYBOOK_TYPE || 'dev';

const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR;

const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR!;

const storybookUrl = process.env.STORYBOOK_URL || 'http://localhost:8001';

const templateName = process.env.STORYBOOK_TEMPLATE_NAME || '';

const type = process.env.STORYBOOK_TYPE || 'dev';

const sandboxDir = process.env.STORYBOOK_SANDBOX_DIR;

if (!sandboxDir) {

throw new Error(

'STORYBOOK_SANDBOX_DIR is required. Sandboxes are generated outside the repo at ../storybook-sandboxes/.'

);

}

🤖 Prompt for AI Agents

In `@code/e2e-tests/addon-mcp.spec.ts` around lines 8 - 11, Replace the non‑null asserted constant sandboxDir so it fails fast with a clear message and provides the usual default; instead of using process.env.STORYBOOK_SANDBOX_DIR! in the top‑level const, read the env var into a variable, and if it is missing throw a descriptive Error (or set to the default sandbox path "../storybook-sandboxes/" resolved to an absolute path) before any path.join usage; update references to the existing sandboxDir constant so code uses the validated/defaulted value and avoid later mysterious path.join failures.

storybook-app-bot · 2026-01-26T10:18:49Z

Package Benchmarks

^{Commit: 09dfdde, ran on 27 January 2026 at 12:49:20 UTC}

The following packages have significant changes to their size or dependencies:

`@storybook/addon-a11y`

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`@storybook/addon-docs`

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`@storybook/addon-links`

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`@storybook/addon-onboarding`

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`storybook-addon-pseudo-states`

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`@storybook/addon-themes`

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`@storybook/addon-vitest`

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`@storybook/builder-vite`

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`@storybook/builder-webpack5`

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`storybook`

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`@storybook/angular`

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`@storybook/ember`

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`@storybook/html-vite`

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`@storybook/nextjs`

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`@storybook/nextjs-vite`

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`@storybook/preact-vite`

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`@storybook/react-native-web-vite`

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`@storybook/react-vite`

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`@storybook/react-webpack5`

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`@storybook/server-webpack5`

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`@storybook/svelte-vite`

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`@storybook/sveltekit`

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`@storybook/vue3-vite`

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`@storybook/web-components-vite`

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`@storybook/cli`

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`@storybook/codemod`

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`@storybook/core-webpack`

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`create-storybook`

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`eslint-plugin-storybook`

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`@storybook/react-dom-shim`

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`@storybook/preset-create-react-app`

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`@storybook/preset-react-webpack`

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`@storybook/preset-server-webpack`

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Self size	0 B	7 KB	🚨 +7 KB 🚨
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`@storybook/html`

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Self size	0 B	29 KB	🚨 +29 KB 🚨
Dependency size	0 B	32 KB	🚨 +32 KB 🚨
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`@storybook/preact`

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`@storybook/react`

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`@storybook/server`

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`@storybook/svelte`

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Dependency size	0 B	230 KB	🚨 +230 KB 🚨
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`@storybook/vue3`

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Dependency size	0 B	211 KB	🚨 +211 KB 🚨
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`@storybook/web-components`

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Dependency count	0	3	🚨 +3 🚨
Self size	0 B	61 KB	🚨 +61 KB 🚨
Dependency size	0 B	47 KB	🚨 +47 KB 🚨
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Build: Fix MCP tests on Windows

7a2871a

valentinpalkovic self-assigned this Jan 26, 2026

valentinpalkovic added the ci:daily Run the CI jobs that normally run in the daily job. label Jan 26, 2026

coderabbitai Bot reviewed Jan 26, 2026

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valentinpalkovic added this to Core Team Projects Jan 27, 2026

valentinpalkovic moved this to Empathy Queue (prioritized) in Core Team Projects Jan 27, 2026

Merge branch 'next' into valentin/fix-mcp-tests-on-windows

09dfdde

valentinpalkovic moved this from Empathy Queue (prioritized) to In Progress in Core Team Projects Jan 27, 2026

valentinpalkovic added the build Internal-facing build tooling & test updates label Jan 27, 2026

valentinpalkovic merged commit 50d226d into next Jan 27, 2026
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valentinpalkovic deleted the valentin/fix-mcp-tests-on-windows branch January 27, 2026 13:50

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github-actions Bot mentioned this pull request Jan 28, 2026

Release: Prerelease alpha 10.3.0-alpha.1 #33621

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Build: Refactor tests for windows #34714

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Build: Fix MCP tests on Windows#33644

Build: Fix MCP tests on Windows#33644
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What I did

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

Manual testing

Documentation

Checklist for Maintainers

🦋 Canary release

Summary by CodeRabbit

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Package Benchmarks

@storybook/addon-a11y

@storybook/addon-docs

@storybook/addon-links

@storybook/addon-onboarding

storybook-addon-pseudo-states

@storybook/addon-themes

@storybook/addon-vitest

@storybook/builder-vite

@storybook/builder-webpack5

storybook

@storybook/angular

@storybook/ember

@storybook/html-vite

@storybook/nextjs

@storybook/nextjs-vite

@storybook/preact-vite

@storybook/react-native-web-vite

@storybook/react-vite

@storybook/react-webpack5

@storybook/server-webpack5

@storybook/svelte-vite

@storybook/sveltekit

@storybook/vue3-vite

@storybook/web-components-vite

@storybook/cli

@storybook/codemod

@storybook/core-webpack

create-storybook

@storybook/csf-plugin

eslint-plugin-storybook

@storybook/react-dom-shim

@storybook/preset-create-react-app

@storybook/preset-react-webpack

@storybook/preset-server-webpack

@storybook/html

@storybook/preact

@storybook/react

@storybook/server

@storybook/svelte

@storybook/vue3

@storybook/web-components

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`@storybook/addon-a11y`

`@storybook/addon-docs`

`@storybook/addon-links`

`@storybook/addon-onboarding`

`storybook-addon-pseudo-states`

`@storybook/addon-themes`

`@storybook/addon-vitest`

`@storybook/builder-vite`

`@storybook/builder-webpack5`

`storybook`

`@storybook/angular`

`@storybook/ember`

`@storybook/html-vite`

`@storybook/nextjs`

`@storybook/nextjs-vite`

`@storybook/preact-vite`

`@storybook/react-native-web-vite`

`@storybook/react-vite`

`@storybook/react-webpack5`

`@storybook/server-webpack5`

`@storybook/svelte-vite`

`@storybook/sveltekit`

`@storybook/vue3-vite`

`@storybook/web-components-vite`

`@storybook/cli`

`@storybook/codemod`

`@storybook/core-webpack`

`create-storybook`

`@storybook/csf-plugin`

`eslint-plugin-storybook`

`@storybook/react-dom-shim`

`@storybook/preset-create-react-app`

`@storybook/preset-react-webpack`

`@storybook/preset-server-webpack`

`@storybook/html`

`@storybook/preact`

`@storybook/react`

`@storybook/server`

`@storybook/svelte`

`@storybook/vue3`

`@storybook/web-components`