fix: add typescript test for our typings (#9096)

* Revert "fix(d.ts): enable angular2 compilation with TS flag --strictNullChecks (#8902)"

This reverts commit 7e352a27f7.

* test: add typescript test for our typings

scripts/ci-lite/build.sh

@@ -9,6 +9,7 @@ cd `dirname $0`
 source ./env.sh
 cd ../..
 
+$(npm bin)/tsc -v
 $(npm bin)/tsc -p tools
 cp tools/@angular/tsc-wrapped/package.json dist/tools/@angular/tsc-wrapped
 node dist/tools/@angular/tsc-wrapped/src/main -p modules

scripts/ci-lite/test_e2e.sh

@@ -23,6 +23,7 @@ echo 'travis_fold:end:test.buildPackages'
 
 
 ./scripts/ci-lite/offline_compiler_test.sh
+./tools/typings-test/test.sh
 
 echo 'travis_fold:start:test.e2e.localChrome'
 cd dist/