New library: stlite, a port of Streamlit to Wasm, powered by Pyodide

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Custom components (experimental) support finally came out! I think one of the biggest advantage of Streamlit is the custom components maintained by the community, so they must be available on stlite too :slight_smile:

Playground app with hiplot
Playground app with hiplot2536Ă—2158 371 KB

Along with it, I added the “requirements” button on the playground app so that users can install additional packages.

Requirements specification on the playground app
Requirements specification on the playground app1452Ă—1080 82.5 KB

Now the initial sample code of the playground app has been updated where a custom component, hi-plot is installed and used for demonstration (and Matplotlib too)!

Please note that this is still experimental and not all the custom components are working, for example because

  • The custom component package has C-extension. Such non-pure Python packages must be specially built for Wasm/Pyodide runtime. This is not stlite’s but Pyodide/Wasm restriction. In this case, installing the package fails (see the devtool for now).
    • For example, stmol, streamlit-echarts, or streamlit-webrtc cannot be installed due to this reason.
  • The custom component frontend loads local resources dynamically after initialization.
    • For example, streamlit-ace can run and it works, but its syntax highlight does not, probably, though I haven’t investigated this issue so much.
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