Babel named default export React plugin

babel-named-exports-plugin.js

const itReturnsJSX = () => true;

const createNamedComponentVisitor = {
  ArrowFunctionExpression(path) {
    const { functionName, types: t } = this;

    if (itReturnsJSX(path)) {
		path.parentPath.replaceWithMultiple([
			t.variableDeclaration('const', [
				t.variableDeclarator(
                  t.identifier(functionName),
                  t.toExpression(path.node)
                )
			]),
          	t.expressionStatement(
				t.assignmentExpression(
					'=',
					t.memberExpression(
						t.identifier(functionName),
						t.identifier('displayName')
                    ),
					t.stringLiteral(functionName)
                )
            ),
          	t.exportDefaultDeclaration(t.identifier(functionName))
        ]);
    }
  }
};


export default function (babel) {
  const { types: t } = babel;
  
  return {
    name: "ast-transform", // not required
    visitor: {
      ExportDefaultDeclaration(path) {
        path.traverse(createNamedComponentVisitor, { functionName: 'testComponent', types: t });
      }
    }
  };
}

test-file.jsx

export default (props) => (
  <span>Test</span>
);

https://astexplorer.net/#/gist/dbd75b848c8c7ca7722211f484db387a/335e3ada7b525e1efa5e0e3cc14ddb405bfb0fe6