Next + API routes + Apollo example with TS

[avxkim]

Current apollo+api routes example is written in JS: https://github.com/zeit/next.js/blob/canary/examples/api-routes-apollo-server-and-client/apollo/client.js

Can someone make a TS version of this example? I'm specifically interested in how to rewrite this, so ESLint + TS wouldn't throw any errors:

// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
const createIsomorphLink = () => {
  if (typeof window === 'undefined') {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const { SchemaLink } = require('apollo-link-schema');
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const { schema } = require('../pages/api/graphql');
    return new SchemaLink({ schema });
  } else {
    // eslint-disable-next-line @typescript-eslint/no-var-requires
    const { HttpLink } = require('apollo-link-http');
    return new HttpLink({
      uri: process.env.API_URL,
      credentials: 'same-origin',
    });
  }
};

I've tried to use: const { SchemaLink } = await import('apollo-link-schema'); but this causes issues with client bundling, it will be bundled in a final bundle no matter the condition typeof window === 'undefined', but with require() it does work as intended.