Typescript error runtime error: Cannot read property 'prototype' of undefined when extending

Question

So I\'m getting the above error in the console. It\'s caused by _super being undefined when it\'s passed to __extends (in the generated .js

Answer 1

Just leaving here how I solved this issue for my case : I missed a reference at the top of the TS file and it was totally ok for the build, whereas I had the same error on runtime. Adding the reference that seemed to be optional solved my runtime issue.