import type { Grader, GraderInput, GraderMetadata, GraderResult } from "../../index.js";
export interface Config {
    substring: string;
    case_sensitive?: boolean;
    negate?: boolean;
}
export type Metadata = Config & {
    output: string;
    [key: string]: unknown;
};
export declare class OutputContainsGrader implements Grader {
    metadata: GraderMetadata;
    private readonly negated;
    constructor(name?: "output-contains" | "output-not-contains");
    /** `output-contains 'hello'` — the substring is what distinguishes instances. */
    defaultName(config: Record<string, unknown>): string;
    /** Negated (`output-not-contains`, or `negate: true`) asserts the output does not contain the text. */
    assertsAbsence(config: Record<string, unknown>): boolean;
    grade(input: GraderInput): Promise<GraderResult>;
}
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