nullsafe
v2.0.2 null nullsafe javascript optional
test
./node_modules/mocha/bin/mocha
coverage
./node_modules/istanbul/lib/cli.js cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage