Adding pyodide js interface

Author: SebieF

src/serious_python_web/lib/pyodide.dart

@@ -0,0 +1,27 @@
+import 'package:js/js.dart';
+
+// Define the external JavaScript functions we need
+@JS('loadPyodide')
+external Object loadPyodide(Object config);
+
+@JS()
+@anonymous
+class PyodideInterface {
+  external Object runPythonAsync(String code);
+  external Object runPython(String code);
+  external Object pyimport(String packageName);
+  external FileSystem get FS;
+  external PyodideGlobals get globals;
+}
+
+@JS()
+@anonymous
+class PyodideGlobals {
+  external Object get(String name);
+}
+
+@JS()
+@anonymous
+class FileSystem {
+  external Object writeFile(String path, String data, Object options);
+}