These files are in the UMD format for greater portablity, and as such
can't be marked as side-effect-free by webpack/build-optimizer/uglify.
PR Close#23366
This helps ensure we use the same tsconfig.json file for all compilations.
Next steps are to make it the same tsconfig.json file used by the editor
PR Close#20964
Igor Minar
Alex Eagle
Alex Eagle
Misko Hevery