export type DiffLine = {
    kind: "context" | "delete" | "insert";
    text: string;
    oldNum: number | null;
    newNum: number | null;
};
export type Hunk = {
    oldStart: number;
    oldLines: number;
    newStart: number;
    newLines: number;
    lines: DiffLine[];
};
export type RenderDiffOpts = {
    lineNumbers?: boolean;
    colored?: boolean;
    oldLabel?: string;
    newLabel?: string;
    hunkHeaders?: boolean;
    summary?: boolean;
    renderBody?: (code: string, kind: DiffLine["kind"], width: number) => string;
};
/**
 * Compute a line-level diff grouped into hunks.
 * `context < 0` -> one hunk spanning everything (full context).
 * `context >= 0` -> keep only changed lines plus `context` unchanged lines on
 * each side; runs separated by more than 2*context unchanged lines split into
 * separate hunks.
 */
export declare function computeHunks(oldText: string, newText: string, context: number, ignoreWhitespace: boolean): Hunk[];
/** Render hunks as a human-readable diff string. */
export declare function renderDiff(hunks: Hunk[], opts?: RenderDiffOpts): string;
/** Render hunks as a standard unified diff that std::fs::applyPatch can apply. */
export declare function renderPatch(hunks: Hunk[], oldLabel: string, newLabel: string): string;
/**
 * Back-compat shim: full-context, colored-by-default inline diff. Existing
 * callers (optimizer reporter, test runner, sourceMutator) rely on this exact
 * output, so it must not change.
 */
export declare function formatDiff(expected: string, actual: string, opts?: {
    colorize?: boolean;
}): string;