Elmstronaut screenshot

Elmstronaut

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Updated: 14 Dec 2025
49 Stars

Render Elm modules as Astro components

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Overview

Elmstronaut is an innovative toolkit designed for developers who want to integrate Elm modules into their Astro projects seamlessly. This integration allows for the rendering of Elm components as Astro components, creating opportunities for dynamic front-end experiences while leveraging the power of Elm’s functional programming model. The clever combination of these technologies paves the way for modern web development, providing both ease of use and enhanced performance.

With Elmstronaut, developers can quickly set up their environments and dive into utilizing Elm’s strengths in a manageable way. Whether you’re building interactive features or simply enhancing user experience, Elmstronaut supports this journey, even offering features like fallback slots for loading components. This makes it not just a toolkit, but a valuable addition to your web development repertoire.

Features

  • Seamless Integration: Elmstronaut enables the effortless rendering of Elm modules as Astro components, allowing a smooth workflow within existing Astro projects.

  • Client-side Rendering: Currently operating without support for server-side rendering (SSR), Elmstronaut utilizes a required client:load directive to ensure components function correctly.

  • Fallback Slot: Utilize a fallback slot to display content while your Elm component loads, enhancing user experience and reducing layout shifts.

  • Efficient Flag Passing: Elm props are automatically passed as flags to your Elm app, with built-in decoding to avoid runtime errors and simplify state management.

  • Ports Support: Integrate communication between your Astro app and Elm modules using ports. This feature allows for interactivity and real-time updates.

  • Tailwind CSS Compatibility: Elmstronaut supports Tailwind CSS, ensuring that styles used within Elm files are included in the final output bundle, making styling convenient and cohesive.

  • Growing Examples Repository: While the current examples are limited, the planned expansion will provide developers with practical instances to learn from and reference.

  • Community Contributions: Encouragement for developers to contribute to the ongoing development and improvement of Elmstronaut ensures a collaborative and evolving project that adapts to user needs.