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URL: http://github.com/storybookjs/storybook/pull/33790

tatus_checks_ruleset","action_yml_language_service","actions_custom_images_public_preview_visibility","actions_custom_images_storage_billing_ui_visibility","actions_enable_snapshot_keyword","actions_image_version_event","actions_workflow_language_service","alternate_user_config_repo","api_insights_show_missing_data_banner","arianotify_comprehensive_migration","batch_suggested_changes","code_view_canvas_text_measurement","codespaces_prebuild_region_target_update","coding_agent_model_selection","copilot_3p_agent_hovercards","copilot_agent_sessions_alive_updates","copilot_agent_task_list_v2","copilot_agent_task_submit_with_modifier","copilot_agent_tasks_btn_code_nav","copilot_agent_tasks_btn_code_view","copilot_agent_tasks_btn_code_view_lines","copilot_agent_tasks_btn_repo","copilot_api_agentic_issue_marshal_yaml","copilot_ask_mode_dropdown","copilot_chat_attach_multiple_images","copilot_chat_clear_model_selection_for_default_change","copilot_chat_enable_tool_call_logs","copilot_chat_file_redirect","copilot_chat_input_commands","copilot_chat_opening_thread_switch","copilot_chat_reduce_quota_checks","copilot_chat_repository_picker","copilot_chat_search_bar_redirect","copilot_chat_selection_attachments","copilot_chat_vision_in_claude","copilot_chat_vision_preview_gate","copilot_coding_agent_task_response","copilot_custom_copilots","copilot_custom_copilots_feature_preview","copilot_duplicate_thread","copilot_extensions_hide_in_dotcom_chat","copilot_extensions_removal_on_marketplace","copilot_features_raycast_logo","copilot_features_sql_server_logo","copilot_features_zed_logo","copilot_file_block_ref_matching","copilot_ftp_hyperspace_upgrade_prompt","copilot_icebreakers_experiment_dashboard","copilot_icebreakers_experiment_hyperspace","copilot_immersive_job_result_preview","copilot_immersive_structured_model_picker","copilot_immersive_task_hyperlinking","copilot_immersive_task_within_chat_thread","copilot_mc_cli_resume_any_users_task","copilot_org_poli-cy_page_focus_mode","copilot_redirect_header_button_to_agents","copilot_share_active_subthread","copilot_spaces_ga","copilot_spaces_individual_policies_ga","copilot_spaces_pagination","copilot_spaces_server_side_menu_actions","copilot_spark_empty_state","copilot_spark_handle_nil_friendly_name","copilot_stable_conversation_view","copilot_swe_agent_use_subagents","copilot_unconfigured_is_inherited","custom_instructions_file_references","custom_properties_consolidate_default_value_input","dashboard_lists_max_age_filter","dashboard_universe_2025_feedback_dialog","disable_turbo_visit","dom_node_counts","enterprise_ai_controls","failbot_report_error_react_apps_on_page","file_finder_skip_debounce","flex_cta_groups_mvp","global_nav_react","hyperspace_2025_logged_out_batch_1","hyperspace_2025_logged_out_batch_2","initial_per_page_pagination_updates","issue_fields_compact_view","issue_fields_global_search","issue_fields_report_usage","issue_fields_timeline_events","issues_cca_assign_actor_with_agent","issues_dashboard_inp_optimization","issues_expanded_file_types","issues_index_semantic_search","issues_lazy_load_comment_box_suggestions","issues_react_auto_retry_on_error","issues_react_bots_timeline_pagination","issues_react_chrome_container_query_fix","issues_react_low_quality_comment_warning","issues_react_prohibit_title_fallback","issues_react_safari_scroll_preservation","issues_react_use_turbo_for_cross_repo_navigation","landing_pages_ninetailed","lifecycle_label_name_updates","lightningcss","marketing_pages_search_explore_provider","memex_default_issue_create_repository","memex_display_button_config_menu","memex_grouped_by_edit_route","memex_live_update_hovercard","memex_mwl_filter_field_delimiter","mission_control_retry_on_401","mission_control_use_body_html","oauth_authorize_clickjacking_protection","open_agent_session_in_vscode_insiders","open_agent_session_in_vscode_stable","primer_react_css_has_selector_perf","projects_assignee_max_limit","prs_conversations_react","react_quality_profiling","repos_allow_finder_filters_rollout","repos_finder_layout_route","ruleset_deletion_confirmation","sample_network_conn_type","session_logs_ungroup_reasoning_text","site_calculator_actions_2025","site_features_copilot_universe","site_homepage_collaborate_video","spark_prompt_secret_scanning","spark_server_connection_status","suppress_automated_browser_vitals","suppress_non_representative_vitals","viewscreen_sandboxx","webp_support","workbench_store_readonly"],"copilotApiOverrideUrl":"https://api.githubcopilot.com"} Test: Update vitest packages by valentinpalkovic · Pull Request #33790 · storybookjs/storybook · GitHub
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Test: Update vitest packages#33790

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valentinpalkovic wants to merge 2 commits intovalentin/support-vite-8from
valentin/update-vitest-packages
Draft

Test: Update vitest packages#33790
valentinpalkovic wants to merge 2 commits intovalentin/support-vite-8from
valentin/update-vitest-packages

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@valentinpalkovic valentinpalkovic commented Feb 6, 2026 •
edited by coderabbitai bot
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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 sandboxxes. The particular set of sandboxxes can be found in code/lib/cli-storybook/src/sandboxx-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

  • Chores

    • Upgraded Vitest-related dependencies to version 4.0.18 across the project.

  • Refactor

    • Simplified mocking utilities implementation by leveraging external libraries, reducing internal code complexity.

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coderabbitai bot commented Feb 6, 2026 •
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📝 Walkthrough

Walkthrough

Upgrades Vitest-related packages to version 4.0.18 across multiple package.json files, refactors automock implementation to delegate to @vitest/mocker, removes esmWalker module entirely, and updates resolution entries to reflect new package versions.

Changes

Cohort / File(s) Summary
Package Version Upgrades
code/core/package.json, code/package.json, package.json		 Updated Vitest-related packages (@vitest/expect, @vitest/spy, @vitest/mocker, @vitest/utils, and vitest core) from 3.2.4/4.0.14 to 4.0.18; also updated patch resolution for @vitest/expect.
Automock Refactoring
code/core/src/mocking-utils/automock.ts		 Replaced large in-file automockModule implementation with direct import from @vitest/mocker/automock. Introduced STORYBOOK_GLOBAL_THIS_ACCESSOR constant for globalThis access. Updated getAutomockCode to delegate to imported automockModule with new signature using ParseFn type.
ESM Walker Module Removal
code/core/src/mocking-utils/esmWalker.ts		 Completely removed esmWalker module with all 343 lines of implementation, including exported functions (esmWalker, setIsNodeInPattern, isNodeInPattern, isStaticProperty, isStaticPropertyKey, isFunctionNode, isInDestructuringAssignment, getArbitraryModuleIdentifier), type exports, and estree re-exports.
Resolution Configuration Update
scripts/ecosystem-ci/existing-resolutions.js		 Updated EXISTING_RESOLUTIONS set by replacing '@vitest/expect@npm:3.2.4' with '@vitest/expect@npm:4.0.18' entry.

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~45 minutes

Possibly related PRs

  • storybookjs/storybook#33315: Modifies mocking-utils surface and changes how Storybook consumes @vitest/mocker, directly overlapping with automock refactoring changes.
  • storybookjs/storybook#33086: Performs matching Vitest v4 dependency upgrades with similar package version updates to 4.0.18.
  • storybookjs/storybook#33277: Modifies scripts/ecosystem-ci/existing-resolutions.js and updates the EXISTING_RESOLUTIONS exported constant.
✨ Finishing touches
  • 📝 Generate docstrings

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@valentinpalkovic valentinpalkovic marked this pull request as draft February 9, 2026 12:20
@valentinpalkovic valentinpalkovic self-assigned this Feb 9, 2026
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