Error codes should be configurable

[russormes]

What

Error codes are very particular to your service. Also, one of the uses of the codes are to obscure information about the errors, so having them public is not always desirable.

Proposal

error.setCodes = function setCodes(codeDict) {
    error.codes = codeDict;
};
error.addCodes = function addCodes(codeDict) {
    error.codes = Object.assign({}, error.codes, codeDict);
};

We expose two functions that allow for error codes to be replaced or extended.

Further to this we could introduce a configuration object to the ayEs lib that allows for you to pass in a custom error codes definition file.

const config = {
   loadErrorCodesFrom: '/path/to/errorCode.js'
}