This was done automatically by tslint, which can now fix issues it finds. The fixer is still pending in PR https://github.com/palantir/tslint/pull/1568 Also I have a local bugfix for https://github.com/palantir/tslint/issues/1569 which causes too many imports to be deleted.
How to run the examples locally
$ cp -r ./modules/playground ./dist/all/ $ ./node_modules/.bin/tsc -p modules --emitDecoratorMetadata -w $ gulp serve $ open http://localhost:8000/all/playground/src/hello_world/index.html?bundles=false