#!/usr/bin/env node
/**
* Preload Python packages during installation
* This script runs runPy to install packages into Pyodide's cache
*
* Note: Requires Node.js with --experimental-wasm-stack-switching flag
*/
import { runPy } from "@mcpc-tech/code-runner-mcp";
const PACKAGES = [
"openpyxl",
"python-docx",
"python-pptx",
"PyPDF2",
];
async function preloadPackages() {
console.log("📦 Preloading Python packages for Pyodide...\n");
// Use async wrapper to allow await
const code = `
import micropip
import asyncio
async def main():
packages = ${JSON.stringify(PACKAGES)}
print(f"Installing {len(packages)} packages...")
for pkg in packages:
print(f" - {pkg}")
await micropip.install(packages)
print("\\n✅ All packages installed successfully!")
asyncio.run(main())
`;
try {
const stream = await runPy(code, {
packages: {
openpyxl: "openpyxl",
"python-docx": "python-docx",
"python-pptx": "python-pptx",
PyPDF2: "PyPDF2",
},
});
const reader = stream.getReader();
const decoder = new TextDecoder();
while (true) {
const { done, value } = await reader.read();
if (done) break;
const text = decoder.decode(value, { stream: true });
process.stdout.write(text);
}
console.log("\n✨ Preload complete!");
} catch (error) {
console.error("\n❌ Preload failed:", error.message);
// Don't fail the install, just warn
console.log("⚠️ Packages will be downloaded on first use");
}
}
preloadPackages();
