Here is official Angular + TypeScript plunk that uses SystemJS 0.19.31 and has been changed to use TypeScript 2.3.0.
When SystemJS configuration of the same plunk is changed to TypeScript 2.3.1 or 2.3.2
'typescript': 'npm:typescript@2.3.1/lib/typescript.js'
it just stops working. No errors in console.
What is the problem with TypeScript 2.3.1? Is it a known issue? Is the problem specific to current setup?