ERROR: Pleas verify that the package.json has a valid "main" entry

[trevans24]

after running the install from the documentation here:
https://www.bookthatapp.com/docs/api/v1/index.html?javascript#introduction

and following the require example,
node throws the error without allowing anything else to happen.

[chrisn-au]

have same issue ?

[berkeleymalagon]

same issue :/

[StasNemy]

I created a PR that fixes problems and adds minimal typing #196