I get the error as below when building project after uninstalling the TypeScript 2.0. (Visual Studio 2015)
tsc : error TS5023: Build:Unknown compiler
I had the some problem. I found out, that I had a wrong (i.e. older) version of typescript installed (in addition to the current one) and even though the latest version was installed too, the old typescript compiler (tsc) was used.
Open a MSBuild Windows Console and run the command following command:
tsc -v
and see what version it gives
uninstalling the old version solved the problem