/usr/lib/ is in node-should 4.0.4+dfsg-1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/nodejs/
/usr/lib/nodejs/should/
/usr/lib/nodejs/should/package.json
/usr/lib/nodejs/should/lib/
/usr/lib/nodejs/should/lib/should.js
/usr/lib/nodejs/should/lib/ext/
/usr/lib/nodejs/should/lib/ext/type.js
/usr/lib/nodejs/should/lib/ext/number.js
/usr/lib/nodejs/should/lib/ext/string.js
/usr/lib/nodejs/should/lib/ext/assert.js
/usr/lib/nodejs/should/lib/ext/property.js
/usr/lib/nodejs/should/lib/ext/eql.js
/usr/lib/nodejs/should/lib/ext/contain.js
/usr/lib/nodejs/should/lib/ext/error.js
/usr/lib/nodejs/should/lib/ext/bool.js
/usr/lib/nodejs/should/lib/ext/chain.js
/usr/lib/nodejs/should/lib/ext/match.js
/usr/lib/nodejs/should/lib/inspect.js
/usr/lib/nodejs/should/lib/eql.js
/usr/lib/nodejs/should/lib/util.js