tsconfig doesn't include tests

The problem with tsconfig.json not including tests is that if the library depends on the TS type libraries, then the tests can have type errors. The fix I've used is to change "includes" to ["src", "test"] in tsconfig.json and create a new tsconfig.prod.json that extends tsconfig.json but doesn't include "test", and also change the build command to run "tsc -p tsconfig.prod.json", but this should really be fixed by default.