playground: basic editor functionality ready

frontend/tools/pyodide-worker.ts

@@ -0,0 +1,27 @@
+import {loadPyodide, version} from "pyodide";
+
+let pyodideReadyPromise = loadPyodide({
+    indexURL: `https://cdn.jsdelivr.net/pyodide/v${version}/full/`, // FIXME: Local deployment?
+    packages: ["micropip", "sqlite3"], // Preloaded faster here...
+    stdout: (msg) => self.postMessage({stdout: msg}),
+    stderr: (msg) => self.postMessage({stderr: msg}),
+    stdin: () => {
+        console.warn("Input requested by Python code, but stdin is not supported in this playground.");
+        return "";
+    },
+});
+
+self.onmessage = async (event) => {
+    // make sure loading is done
+    const pyodide = await pyodideReadyPromise;
+    const {id, code} = event.data;
+    // Now load any packages we need, run the code, and send the result back.
+    await pyodide.loadPackagesFromImports(code);
+    try {
+        // Execute the python code in this context
+        const result = await pyodide.runPythonAsync(code);
+        self.postMessage({result, id});
+    } catch (error: any) {
+        self.postMessage({error: error.message, id});
+    }
+};