Store typedef on the helper and use it to show a parameter list

site/components/Class.jsx

@@ -0,0 +1,35 @@
+import {object} from 'prop-types';
+import React from 'react';
+import Markdown from 'react-markdown';
+import Code from './Code';
+import Parameter from './Parameter';
+
+function Class({cls, module, helper}) {
+  const exportedName = module.getExportedName(cls.name);
+  let importCode;
+  if (exportedName === 'default') {
+    importCode = `import ${cls.name} from '${module.id}';`;
+  } else {
+    importCode = `import {${exportedName}} from '${module.id}';`;
+  }
+
+  return (
+    <div>
+      <h3>{cls.name}</h3>
+      <Code value={importCode} />
+      <Markdown source={cls.doc.classdesc} renderers={{code: Code}} />
+      <h6>Parameters</h6>
+      <ul>
+        {cls.doc.params && cls.doc.params.map(param => <Parameter param={param} module={module} helper={helper} />)}
+      </ul>
+    </div>
+  );
+}
+
+Class.propTypes = {
+  cls: object.isRequired,
+  module: object.isRequired,
+  helper: object.isRequired
+};
+
+export default Class;