Miscellaneous

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

Errors

argError : Send an argument error.
codeError : Send an internal error.
permissionsError : Send a permission error.

Arguments

getThing : Get easily arguments of a given type.

JSON Utilities

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

Permissions

isOwner : Returns true if the given ID is included in the owners set in CommandHandler.create.
isPermission : Returns true if the given string is a valid permission. It's also a type guard for PermissionString type for TypeScript users.

Other

cutIfTooLong : Cut a text at a given length (if too long).
getKeyByValue : Get a key from a value in an object.
random : Returns a random value from an array.