worker.js

self.importScripts('https://cdn.jsdelivr.net/pyodide/v0.27.5/full/pyodide.js');

async function loadPyodideAndPackages() {

    let pyodide = await loadPyodide();
    await pyodide.loadPackage("micropip");
    const micropip = pyodide.pyimport("micropip");
    await micropip.install('deepdiff');
    await micropip.install('endf_parserpy');

    // Set the stdout handler
    // pyodide.setStdout({
    //     batched: (message) => {
    //         self.postMessage({ output: message });
    //     }
    // });

    // Set the stderr handler
    pyodide.setStderr({
        batched: (message) => {
            self.postMessage({ warning: message });
        }
    });
    return pyodide;
}

loadPyodideAndPackages().then(pyodide => {
    self.onmessage = async (event) => {
        const { lhsText, rhsText } = event.data;

        // Run the Python code
        const pythonCode = `
import json
from deepdiff import DeepDiff
import endf_parserpy as ep

lhs_data = """${lhsText.replace(/"""/g, '\\"""')}"""  # Escape triple quotes
rhs_data = """${rhsText.replace(/"""/g, '\\"""')}"""  # Escape triple quotes

parser = ep.EndfParser(print_cache_info=False)
tape_lhs = parser.parse(lhs_data)
tape_rhs = parser.parse(rhs_data)

d = DeepDiff(tape_lhs, tape_rhs)
diffs_json = d.to_json()
diffs_json
`;
        try {
            let output = await pyodide.runPythonAsync(pythonCode);
            // Send the result back to the main thread
            self.postMessage({ output: output });
        } catch (error) {
            // Send any errors back to the main thread
            self.postMessage({ error: error.message });
        }
    };
});