Tom,
Were you able to resolve the problem with viewing .ts files in the TypeScript Editor?
By default, the TypeScript preferences page points to Node 4.x version unless it is manually changed to point to a different version.
If you are still seeing issues, then please switch to a new workspace, do not change any preferences and then check if the .ts files can be opened in the TypeScript Editor.
Apologies for inconvenience caused. Please let us know how you get on with this issue.
–Swapna
MyEclipse Support