Pyodide JavaScript package

Usage

Download and extract Pyodide packages from Github releases (pyodide-build-*.tar.bz2). The version of the release needs to match exactly the version of this package.

Then you can load Pyodide in Node.js as follows,

let pyodide_pkg = await import("pyodide/pyodide.js");

let pyodide = await pyodide_pkg.loadPyodide({
  indexURL: "<pyodide artifacts folder>",
});

await pyodide.runPythonAsync("1+1");

Note: To start node REPL with support for top level await, use node --experimental-repl-await.

See the documentation fore more details.

Details

The JavaScript code in this package is responsible for the following tasks:

1. Defines the public JavaScript API
   • Package loading code to allow loading of other Python packages.
   • Can load micropip to bootstrap loading of pure Python wheels
2. Loads the CPython interpreter and the core/pyodide emscripten application which embeds the interpreter.
3. Injects the js/pyodide JavaScript API into sys.modules. This is the final runtime dependency for core/pyodide & py/pyodide, so after this step the interpreter is fully up and running.