import type { DiffFilesProvider } from '@vltpkg/query';
/**
 * Validates that a commitish string is safe to use
 * in a git command.
 */
export declare const validateCommitish: (commitish: string) => string;
/**
 * Creates a {@link DiffFilesProvider} that uses
 * `git diff --name-only` to determine changed files.
 * @param {string} projectRoot - The absolute path to the
 *   project root directory where git commands will be
 *   executed.
 * @returns {DiffFilesProvider} A function that takes a
 *   commitish and returns a Set of changed file paths
 *   relative to the project root.
 */
export declare const createDiffFilesProvider: (projectRoot: string) => DiffFilesProvider;