public @NonNull Builder<C> literal(
                final @NonNull String main,
                final @NonNull String... aliases
        ) {
            return this.required(main, LiteralParser.literal(main, aliases));
        }
Inserts a required literal into the command chain.

@param main    main argument name
@param aliases argument aliases
@return new builder instance with the modified command chain
cloud-core/src/main/java/org/incendo/cloud/Command.java