import type * as Command from "effect/unstable/cli/Command";
export declare const COMPLETION_SHELLS: readonly ["bash", "zsh", "fish"];
export type CompletionShell = (typeof COMPLETION_SHELLS)[number];
export type CompletionValueProvider = (path: readonly string[], argumentDepth: number, positional: readonly string[]) => readonly string[] | undefined;
export declare function isCompletionShell(value: string): value is CompletionShell;
export declare function visibleCommandNames(command: Command.Command.Any): string[];
export declare function filterCompletionCandidates(candidates: readonly string[], currentWord: string): string[];
export declare function completionCandidates(program: Command.Command.Any, words: readonly string[], dynamicValues?: CompletionValueProvider): string[];
export declare function completionScript(shell: CompletionShell, binary: string, program: Command.Command.Any): string;