There are many utils functions that can be used in many places to avoid duplicating code, you can see a list here:

• ArgError : Send an argument error.
• CodeError : Send an internal error.
• PermissionsError : Send a permission error.

• GetThing : Get easily arguments of a given type.

• saveJSON : Saves a JSON safely, returning a boolean meaning if it worked.
• readJSON : Reads a JSON, prefer using import or require.

• CutIfTooLong : Cut a text at a given length (if too long).
• GetKeyByValue : Get a key from a value in an object.
• IsOwner : Returns true if the given ID is included in the owners set in CommandHandler.create.
• Random : Returns a random value from an array.