first commit.

docs/public/worker.js

@@ -0,0 +1,29 @@
+// webworker.js
+
+// Setup your project to serve `py-worker.js`. You should also serve
+// `pyodide.js`, and all its associated `.asm.js`, `.json`,
+// and `.wasm` files as well:
+importScripts("https://cdn.jsdelivr.net/pyodide/v0.24.1/full/pyodide.js")
+
+async function loadPyodideAndPackages() {
+  self.pyodide = await loadPyodide()
+}
+
+const pyodideReadyPromise = loadPyodideAndPackages()
+
+self.onmessage = async (event) => {
+  // make sure loading is done
+  await pyodideReadyPromise
+  // Don't bother yet with this line, suppose our API is built in such a way:
+  const { id, python, input } = event.data
+  // Now is the easy part, the one that is similar to working in the main thread:
+  try {
+    let result = ""
+    self.pyodide.setStdin({ stdin: () => input })
+    self.pyodide.setStdout({ batched: (str) => (result = str) })
+    await self.pyodide.runPythonAsync(python)
+    self.postMessage({ result, error: '', id })
+  } catch (error) {
+    self.postMessage({ result: '', error: error.message, id })
+  }
+}