export type DiffMode = 'uncommitted' | 'staged' | 'branch';
/**
 * Files changed under `mode`, as paths relative to `anchor` (the directory
 * holding pipework.config.ts — the same base module paths are relative to).
 *
 * Three path coordinate systems meet here, and they only coincide when the
 * anchor IS the git toplevel: `git diff --name-only` prints toplevel-relative
 * paths regardless of cwd, `git ls-files --others` prints cwd-relative paths,
 * and module paths are anchor-relative. Every git command therefore runs from
 * the toplevel and every returned path is rebased onto the anchor before it is
 * handed to `filesToModules` — otherwise a config dir below the toplevel
 * (monorepo layout, e.g. <repo>/packages/backend) makes every diff path miss
 * the module prefix match and `rootChanged` widens every scoped run to all
 * modules. A change outside the anchor subtree comes back as a `../` path,
 * which deliberately matches no module and keeps the fail-wide behavior.
 *
 * `branch` mode (the `--fast` path) returns `null` — never an empty array —
 * when the set cannot be computed (no base branch, unrelated history, no git):
 * the caller must fail open on `null`, widening to everything, never silently
 * scoping to nothing. Issue #325.
 *
 * `uncommitted` / `staged` modes return `[]` on a non-git or empty tree — a
 * clean tree genuinely has nothing to do, and the caller exits 0 (#266). An
 * empty array always means "computed cleanly, nothing changed".
 */
export declare function changedFiles(anchor: string, mode: DiffMode, baseBranches?: readonly string[]): string[] | null;
/**
 * The base branch a `branch`-mode diff would be taken against, for scope
 * reporting (the population line). `null` when none exists or git is absent.
 */
export declare function resolveBaseBranch(anchor: string, baseBranches?: readonly string[]): string | null;
export declare function filesToModules(files: readonly string[], modulePaths: readonly string[]): {
    modules: Set<string>;
    rootChanged: boolean;
};
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