NextJS - Unexpected Token Import

Question

While integrating react-syntax-highlighter into my next-js project I've used the following code:

import { Prism as SyntaxHighlighter } from "react-syntax-highlighter";
import { okaidia } from "react-syntax-highlighter/dist/esm/styles/prism";

...

<SyntaxHighlighter language="jsx" style={okaidia}>
{some code goes here}
</SyntaxHighlighter>

...

I get the following error upon running npm run dev, but only if I run the page directly.

Unexpected token export
/Users/johndetlefs/repos/tal-gel-framework/node_modules/react-syntax-highlighter/dist/esm/styles/prism/index.js:1
(function (exports, require, module, __filename, __dirname) { export { default as coy } from './coy';
                                                              ^^^^^^

SyntaxError: Unexpected token export
    at createScript (vm.js:80:10)
    at Object.runInThisContext (vm.js:139:10)
    at Module._compile (module.js:617:28)
    at Object.Module._extensions..js (module.js:664:10)
    at Module.load (module.js:566:32)
    at tryModuleLoad (module.js:506:12)
    at Function.Module._load (module.js:498:3)
    at Module.require (module.js:597:17)
    at require (internal/module.js:11:18)
    at Object.react-syntax-highlighter/dist/esm/styles/prism (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:7242:18)
    at __webpack_require__ (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:23:31)
    at Module../pages/components.js (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:6839:104)
    at __webpack_require__ (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:23:31)
    at Object.3 (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:7175:18)
    at __webpack_require__ (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:23:31)
    at module.exports../js/config/libs/_theme-foundation--colors.js.config.themes.list.name (/Users/johndetlefs/repos/tal-gel-framework/.next/server/static/development/pages/components.js:91:18)

If I navigate to the page via another page then everything works great. If I then refresh the page I get the error.

Removing the line

import { okaidia } from "react-syntax-highlighter/dist/esm/styles/prism";

and removing the style attribute from the component fixes everything, but uses the default prism style, which is not the desired outcome.

Looking around I can see people have similar issues, and that the fix probably has something to do with the next.js.config file, and how the css file is being loaded server-side, but I'm not 100% what to do there.

Assuming the next.js.config file is a part of the solution, here are the current contents.

const withSass = require("@zeit/next-sass");
const withCSS = require("@zeit/next-css");

module.exports = withCSS(
  withSass({
    webpack(config) {
      config.module.rules.push({
        test: /\.(png|jpg|gif|svg|eot|ttf|woff|woff2)$/,
        use: {
          loader: "url-loader",
          options: {
            limit: 100000
          }
        }
      });
      config.module.rules.push({
        test: /\.svg$/,
        use: ["@svgr/webpack"]
      });
      return config;
    }
  })
);

I've tried both with & without withCSS and the issue stays the same.

Any help would be much appreciated! 👍

Answer 1

After digging around for a while, I checked out the npm packages directory and found that there are two types of dists: cjs & esm. The simple fix is just using the cjs dist instead of the esm dist.

import { darcula } from 'react-syntax-highlighter/dist/cjs/styles/prism';

Hope this helps :)