import type { SemanticProgramIndex, SpiDiffOverlay } from './types.js';
export type GitDiffRunner = (args: ReadonlyArray<string>, cwd: string) => string;
export type ComputeSpiDiffOverlayOptions = {
    spi: SemanticProgramIndex;
    root: string;
    baseRef: string;
    headRef?: string;
    runGitDiff?: GitDiffRunner;
};
export declare function computeSpiDiffOverlay(opts: ComputeSpiDiffOverlayOptions): SpiDiffOverlay;