Version Details and Security Vulnerabilities

Both versions 9.0.4 and 9.0.5 of the @storybook/addon-viewport npm package are essentially placeholder packages, explicitly marked as "Empty package - please don't use it anymore." This is crucial for developers to note immediately; installing either version will not provide any functional viewport addon for Storybook. The metadata for both versions is nearly identical, sharing the same description, MIT license, repository URL pointing to the Storybook GitHub repository, and funding information via Open Collective.

While both list the same number of files (10) and unpacked size (3358 bytes), the primary difference lies in their releaseDate. Version 9.0.4 was released on June 1st, 2025, while version 9.0.5 was released a few days later, on June 5th, 2025. This suggests a minor adjustment or republishing of the package, but without any substantive changes to the (lack of) functionality.

For developers considering using a viewport addon, these "empty" versions are a warning sign. Instead of installing either of these versions, users should explore actively maintained and functional alternatives designed for Storybook. Searching the Storybook addons marketplace or npm for "storybook viewport addon" will reveal viable options. These alternatives likely offer features to simulate different device sizes and resolutions within the Storybook environment, aiding in responsive design testing and development.