/** A bash completion script. `complete -F _<cmd> <cmd>`; completes the command, then
 *  per-command subcommands/flags. Self-contained — no bash-completion library required. */
export declare function bashCompletion(cmd: string): string;
/** A zsh completion script (`#compdef <cmd>`). Install by putting it on $fpath, or
 *  eval it: `source <(${cmd} completions zsh)`. */
export declare function zshCompletion(cmd: string): string;
/** `ztrack completions <bash|zsh>`. Returns true if it handled the command. */
export declare function handleCompletionsCommand(args: string[], cmd: string): boolean;