[Bug]: Storybook 8 injecting packageManager on NPM

[mosesoak]

Describe the bug

Partial duplicate of #29146 – that issue relates to PNPM

Storybook alters the project's package.json adding a packageManager entry that is

A) Undesired – how to disable this invasive behavior?

B) Incorrect – it sets it to Yarn even though the project uses NPM, not Yarn

Reproduction link

None

Reproduction steps

No response

System

Storybook Environment Info:

  System:
    OS: macOS 15.3
    CPU: (16) arm64 Apple
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 20.18.0 - ~/.nvm/versions/node/v20.18.0/bin/node
    Yarn: 1.22.22 - ~/.nvm/versions/node/v20.18.0/bin/yarn
    npm: 10.8.2 - ~/.nvm/versions/node/v20.18.0/bin/npm <----- active
  Browsers:
    Chrome: 133.0.6943.142
    Safari: 18.3
  npmPackages:
    @storybook/addon-essentials: ^8.5.3 => 8.5.5
    @storybook/addon-interactions: ^8.5.3 => 8.5.5
    @storybook/addon-links: ^8.5.3 => 8.5.4
    @storybook/addon-styling-webpack: ^1.0.1 => 1.0.1
    @storybook/addon-themes: ^8.5.3 => 8.5.5
    @storybook/blocks: ^8.5.3 => 8.5.5
    @storybook/preview-api: ^8.5.3 => 8.5.3
    @storybook/react: ^8.5.3 => 8.5.3
    @storybook/react-webpack5: ^8.5.3 => 8.5.3
    chromatic: ^6.19.9 => 6.19.9
    storybook: ^8.5.3 => 8.5.5
    storybook-addon-react-router-v6: ^2.0.15 => 2.0.15
    storybook-react-i18next: ^3.2.1 => 3.2.1

Additional context

No response

[greptile-apps]

** Disclaimer** This information might be inaccurate, due to it being generated automatically
This behavior is controlled in code/lib/cli/src/detect.ts. To prevent Storybook from adding the packageManager field: 1. Add STORYBOOK_DISABLE_PACKAGE_MANAGER_DETECTION=true to your environment variables The incorrect detection likely occurs in the getPackageManager() function in detect.ts which checks for lockfiles in this order: - yarn.lock - pnpm-lock.yaml - package-lock.json This means if both yarn.lock and package-lock.json exist, yarn will be incorrectly detected. You can either: 1. Delete any yarn.lock file if not using yarn 2. Set the environment variable above to disable detection entirely

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