refac: fetch pyodide deps at build time, not checked into git

scripts/prepare-pyodide.js

@@ -0,0 +1,29 @@
+const packages = ['requests', 'beautifulsoup4', 'numpy', 'pandas', 'matplotlib'];
+
+import { loadPyodide } from 'pyodide';
+import { writeFile, copyFile, readdir } from 'fs/promises';
+
+async function downloadPackages() {
+	console.log('Setting up pyodide + micropip');
+	const pyodide = await loadPyodide({
+		packageCacheDir: 'static/pyodide'
+	});
+	await pyodide.loadPackage('micropip');
+	const micropip = pyodide.pyimport('micropip');
+	console.log('Downloading Pyodide packages:', packages);
+	await micropip.install(packages);
+	console.log('Pyodide packages downloaded, freezing into lock file');
+	const lockFile = await micropip.freeze();
+	await writeFile('static/pyodide/pyodide-lock.json', lockFile);
+}
+
+async function copyPyodide() {
+	console.log('Copying Pyodide files into static directory');
+	// Copy all files from node_modules/pyodide to static/pyodide
+	for await (const entry of await readdir('node_modules/pyodide')) {
+		await copyFile(`node_modules/pyodide/${entry}`, `static/pyodide/${entry}`);
+	}
+}
+
+await downloadPackages();
+await copyPyodide();