MessageHandlerOptions

What one message command sets for itself, over the app's messages options.

Use it to give a command its own prefix or case, aliases, a description for a help listing, or the places it works. The app-wide defaults are MessageCommandOptions.

The handler's own prefixes, in place of the app's; a mention of the bot still counts when the app accepts one. false matches the message as it is, with no prefix or mention. Where a message also fits a handler with the same pattern that takes the app's prefixes, as it can when the app's prefix is a function, this handler runs, whatever order the controllers are listed in.

'only' starts the command in a server with a mention of the bot and nothing else, whatever the app's prefixes, so it needs no MessageContent intent. In a direct message it starts as usual, after its own prefix or the app's.

Overrides the app's caseSensitive for this handler.

Other words for the command, each in place of the words the pattern begins with: with ['b'], ban {target:member} also takes !b @ana. HandlerRegistry lists the handler once, with its aliases.

What the command does, shown by the built-in help and by HandlerRegistry.

Where the command works; 'any' by default. A message sent elsewhere gets a usage reply saying where it works, and the handler does not run. A command with a member, role or channel param works in servers only; 'dm' with one is refused as the bot starts.

Leaves the command out of the built-in help's list and of a parent's list of subcommands. It is not a secret: it still runs, a misuse still gets its usage, and !help <command> still shows it when named.