import type { expect } from "vitest";
type Expect = typeof expect;
type ExpectExtend = Expect["extend"];
type ExpectExtendObject = Parameters<ExpectExtend>[0];
interface CustomMatchers<R = unknown> {
    toMatchFragment(frag: string): R;
}
declare module "vitest" {
    interface Assertion<T = any> extends CustomMatchers<T> {
    }
    interface AsymmetricMatchersContaining extends CustomMatchers {
    }
}
/**
 * Extend jest's expect with a matcher for PreTeXt fragments. This matcher
 * will normalize the input HTML before comparing it to the expected HTML.
 *
 * You may need to include
 * ```
 *   interface CustomMatchers<R = unknown> {
 *       toMatchFragment(frag: string): R;
 *   }
 *   declare module "vitest" {
 *       interface Assertion<T = any> extends CustomMatchers<T> {}
 *       interface AsymmetricMatchersContaining extends CustomMatchers {}
 *   }
 *
 * ```
 * for vitest/jest types to work correctly.
 */
export declare const jestToMatchFragment: ExpectExtendObject;
export {};
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