Class MessageContext<T>

The Client instance your Command is registered with

The content of the message that will be parsed for the command and arguments. This can be modified by rules to affect what will be parsed (to strip a prefix, for example). Assuming a regex or function trigger does not trigger a command, the first string of characters terminated by any whitespace will be parsed as a command identifier, and the remaining (trimmed) content will be parsed as arguments

The Discord.js Message that triggered the Command

Whether or not a prefix was used. Should be set by rules that check for prefixes (which should then strip the used prefix from content)