import type { ScanOptions } from '../config/types.js';
/**
 * Options forwarded from the CLI for the --explain command.
 */
export interface ExplainOptions extends ScanOptions {
    key: string;
}
/**
 * Implements `dotenv-diff --explain <KEY>`.
 *
 * Reports where the key is defined in env files, where it is used in the
 * codebase, and its overall status (defined / used / duplicated / ignored).
 * @param opts Explain options from CLI
 * @returns void
 */
export declare function explainKey(opts: ExplainOptions): Promise<void>;
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