/**
 * 获取当前 commit 与前一次 commit 的 diff 内容
 * @param files 可选文件路径列表；传入后仅返回这些文件在当前提交中的 diff
 * @returns diff 文本，初始 commit 返回空字符串
 */
export declare const getCommitDiff: (files?: ReadonlyArray<string>) => string;
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