BCould you show the detail of getRegistrant function?
BTypescript can not infer types if you return different data by random input
BTry only return registrant and no if no throw error
NYou’re returning a single or an array right?
NTypescript doesn’t know which one you received unless you check on the client with Array.isArray
NIt’s a “union” type
NWhy would it fix it? You’re now trying to access name on something guaranteed to be an array right?
NThe error message typescript spits out is a little complex because your type is complex, but it’s actually giving you the information you need
NProperty name does not exist on YOURTYPE[]
NDo what's right for your needs
NIt will probably make your life easier by pushing the decision to the frontend, but also it might not 
NLearn to narrow types / unions in typescript and both methods are fine
NNo problem 