Error when using with-typescript-eslint-jest example for testing

[sdornan]

I have a relatively simple Typescript-powered Next.js application. I am attempting to use the with-typescript-eslint-jest example to add unit testing to my application. However, after implementing the example I get Unexpected reserved word 'interface' when running my first test because the page I'm testing defines an interface. The example doesn't seem to define any types or interfaces in the example page, so I'm not sure if this is unsupported with the example configuration or if I'm doing something wrong. Any ideas?