Currently constants.names and constants.codes are exported as Arrays, which means looking-up if a particular name or code exists requires scanning the whole array.

Please export those name and codes as objects directly so that callers can lookup directly, and also get the name from the code, and vice-versa (since the object structure has rich info on relations between them, which is lost when Object.keys is performed).

Something like below:

 exports.names = Object.freeze(constants.names)
 exports.codes = Object.freeze(constants.codes)