/**
 * Line diffs for the file a tool just changed.
 *
 * The agent saying `write_file · src/policy.ts` tells you a file moved but not what moved in it.
 * A diff is the difference between trusting a change and seeing it, and seeing it is what makes
 * an unwanted edit obvious while it is still one `/revert` away.
 *
 * Nothing here reads the disk. It takes the two versions and returns the shape of the change,
 * which keeps it pure and makes every case — creation, deletion, truncation, binary — testable
 * without a filesystem.
 */
export type DiffLineKind = 'add' | 'del' | 'ctx';
export interface DiffLine {
    kind: DiffLineKind;
    text: string;
    /** 1-based line number in the old file; absent on added lines. */
    before?: number;
    /** 1-based line number in the new file; absent on removed lines. */
    after?: number;
}
export interface DiffHunk {
    lines: DiffLine[];
}
export interface FileDiff {
    path: string;
    added: number;
    removed: number;
    hunks: DiffHunk[];
    /** The file did not exist before. */
    created: boolean;
    /** The file no longer exists. */
    deleted: boolean;
    /** Contents are not text, so no line diff is meaningful. */
    binary: boolean;
    /** Hunks were dropped to keep the render bounded; this is how many lines went unshown. */
    hiddenLines: number;
    /** Nothing changed. */
    unchanged: boolean;
}
/** A NUL byte is the conventional and reliable marker that content is not text. */
export declare function looksBinary(s: string): boolean;
/**
 * The diff for one file. `null` means the file did not exist on that side, which is how
 * creation and deletion are expressed rather than as separate flags the caller must set.
 */
export declare function fileDiff(filePath: string, before: string | null, after: string | null, opts?: {
    context?: number;
    maxLines?: number;
}): FileDiff;
/** "+12 −3", the one-line shape of a change, for a header beside the file name. */
export declare function diffSummary(d: FileDiff): string;
//# sourceMappingURL=diff-view.d.ts.map