Module build failed: Error: Final loader

[rsokz]

Getting the following 2 errors:

ERROR in ./client/components/Protected.Route.tsx
Module build failed: Error: Final loader (./node_modules/awesome-typescript-loader/dist/entry.js) didn't return a Buffer or String

ERROR in ./client/graphql/queries/currentUser.ts
Module build failed: Error: Final loader (./node_modules/awesome-typescript-loader/dist/entry.js) didn't return a Buffer or String

Protected.Route.tsx:

import * as React from 'react';
import { Route, Redirect, RouteProps } from 'react-router-dom';
import { Query } from 'react-apollo';
import currentUserQuery from '../graphql/queries/currentUser';

interface ProtectedRouteProps extends RouteProps {
  component: React.ComponentType<RouteProps>;
}

const ProtectedRoute = ({ component: Component, ...rest }: ProtectedRouteProps) => (
  <Route
    {...rest}
    render={props => {
      <Query query={currentUserQuery}>
        {({ loading, data: { currentUser } }) => {
          if (loading) return null;
          if (currentUser) {
            return <Component {...props} />;
          }
        }}
      </Query>;
      return (
        <Redirect
          to={{
            pathname: '/login',
            state: {
              from: props.location
            }
          }}
        />
      );
    }}
  />
);

export default ProtectedRoute;

And currentUser.ts:

import { gql } from 'apollo-boost';

export default gql`
  {
    currentUser {
      id
      email
      name
    }
  }
`;

I've tried adding the following to tsconfig:

"awesomeTypescriptLoaderOptions": {
    "useWebpackText": true,
    "useTranspileModule": true,
    "doTypeCheck": true,
    "forkChecker": true
  }

allowJs is set to true

Any help would be REALLY appreciated!

Versions:
awesome-typescript-loader 5.2.1
typescript: 3.1.6