import type { Command } from "commander";
import type { EmitContext, HarneryProgramContext } from "../commander.js";
/**
 * `harn completion`: emit / install shell completion scripts.
 *
 *   harn completion bash | zsh | fish    → write generated script to stdout
 *   harn completion install [--shell ...] → install to the conventional location
 *
 * And the hidden internal entry point:
 *
 *   harn __complete <provider> -- <partial>
 *     Called by the generated shell scripts at tab-time for dynamic-value
 *     completion. Returns newline-separated candidate values. Empty exit
 *     code 0 even on errors (don't disrupt the user's tab).
 */
export declare function registerCompletionCommand(program: Command, _emit: EmitContext, context?: HarneryProgramContext): void;
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