/**
 * diff-contains grader — assert on the cumulative working-tree diff a stimulus
 * produced (starting state → ending state, scoped to the workspace).
 *
 * Patterns are regex by default; a `value` field provides a literal-substring
 * convenience. The negated variant (`diff-not-contains`) passes when the
 * pattern is absent from the diff.
 *
 *   diff-contains      / diff-not-contains   (regex/literal on the workspace diff)
 *   diff-empty                                (workspace diff is empty)
 */
import type { Grader, GraderInput, GraderMetadata, GraderResult } from "../../index.js";
export declare class DiffMatchGrader implements Grader {
    metadata: GraderMetadata;
    constructor(name?: "diff-contains" | "diff-not-contains");
    /** `diff-contains 'TODO'` or `diff-contains /TODO/` — the schema allows
     *  exactly one of `value`/`pattern`, so whichever is set discriminates. */
    defaultName(config: Record<string, unknown>): string;
    grade(input: GraderInput): Promise<GraderResult>;
}
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