I suspect you didn't set target to ES6 in the `tsconfig.json` file which would limit some of the features. If you don't specify, I think the default is ES5. See

I suspect you didn't set target to ES6 in the `tsconfig.json` file which would limit some of the features. If you don't specify, I think the default is ES5. See this example: https://github.com/styfle/react-server-example-tsx/blob/master/tsconfig.json#L5 https://github.com/styfle/react-server-example-tsx/blob/mast...