i'm almost there
My code

const path = require('path');
const fs = require('fs');
const wa = require('webassembly');
const pyodidejs = require('./src/wasm/pyodide.asm.js');
const wasmPath = path.join(__dirname, '/src/wasm/pyodide.asm.wasm');
const baseURL = path.join(__dirname, '/src/wasm/');
let pyodide;
function loadLanguage() {
    return new Promise((resolve, reject) => {
        let Module = {};
        fetch_node(wasmPath).then((buffer) => buffer.arrayBuffer()).then((arrayBuffer) => {
            let wasm_promise = WebAssembly.compile(arrayBuffer);
            Module.instantiateWasm = (info, receiveInstance) => {
                wasm_promise
                .then(module => WebAssembly.instantiate(module, info))
                .then(instance => receiveInstance(instance));
                return {};
            };
            Module.filePackagePrefixURL = baseURL;
            Module.postRun = () => {
                Module = null;
                console.log('will resolve'); // never gets here
                resolve();
            };
            pyodide = pyodidejs(Module);
        })
    });
}

async function init() {
    await loadLanguage();
    console.log(pyodide.runPython);
    console.log('Python loaded');
}

function fetch_node(file) {
    return new Promise((resolve, reject) => 
    fs.readFile(file, (err, data) => err ? reject(err) : resolve({ arrayBuffer: () => data })));
}
init();

got this error

Fatal Python error: Py_Initialize: Unable to get the locale encoding
ModuleNotFoundError: No module named 'encodings'

Current thread 0x00000000 (most recent call first):
exception thrown: abort(). Build with -s ASSERTIONS=1 for more info.

let me know if you have any ideas

Uh oh!

Run in node.js #14

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