message: Remove case that could never happen.
diff: @@ -443,10 +443,6 @@ export class DocumentConverter {
  oldNamespacedName: namespaceName
  });
  }
  - } else if (isDeclaration(exportedExpression)) {
  - // TODO (justinfagnani): remove this case? Is it used? Add a
  - // test
  - path.replace(jsc.exportDefaultDeclaration(exportedExpression));
  } else {
  let name = namespaceMemberPath[namespaceMemberPath.length - 1];
  // Special Polymer workaround: Register & rewrite the
  @@ -979,15 +975,6 @@ function getNamespaceExports(
  }
  -
  -/**
  - * Returns true if a node is a class or function declaration
  - */
  -function isDeclaration(node: Node) {
  - const type = node.type;
  - return type === 'ClassDeclaration';
  -}
  -
  /**
  * If a statement appears to be an export, returns the exported declaration.
  *
  