// addons.js
import "storybook-styled-components/register";

// config.js
import { configure, addDecorator } from "@storybook/react";
import { withThemes } from "storybook-styled-components";

// then import your themes
import firstTheme from "./src/themes/first";
import secondTheme from "./src/themes/second";

const themes = {
  "First Theme": firstTheme,
  "Second Theme": secondTheme
};

// now add the decorator
addDecorator(withThemes(themes));
// done!