minimum reproduction of issue with typegoose nested discriminators
npm i to install deps
Issue solved: requires ES6 as tsconfig target, ES5 transpiles arrow function to regular function. npm run es5 to see error thrown, npm run es6 for no errors.
documentation for nested discriminators here
used the example for [Class] & the passing nestedDiscriminators tests with minute changes (brevity, ? & ! added to class members)