type Ctor = new (...args: never[]) => unknown;
type ThrowMatcher = string | RegExp | Error | Ctor | ((err: Error) => boolean);
interface Matchers<T> {
    toBe(expected: T): void;
    toEqual(expected: unknown): void;
    toBeDefined(): void;
    toBeUndefined(): void;
    toBeTruthy(): void;
    toBeFalsy(): void;
    toBeInstanceOf(ctor: Ctor): void;
    toBeGreaterThan(n: number): void;
    toBeGreaterThanOrEqual(n: number): void;
    toBeLessThan(n: number): void;
    toBeLessThanOrEqual(n: number): void;
    toContain(item: unknown): void;
    toHaveLength(n: number): void;
    toHaveProperty(path: string): void;
    toThrow(matcher?: ThrowMatcher): void;
}
interface AsyncMatchers<T> {
    toBe(expected: T): Promise<void>;
    toBeUndefined(): Promise<void>;
    toThrow(matcher?: ThrowMatcher): Promise<void>;
}
interface Expect<T> extends Matchers<T> {
    readonly not: Pick<Matchers<T>, 'toBe' | 'toThrow'>;
    readonly resolves: AsyncMatchers<Awaited<T>>;
    readonly rejects: AsyncMatchers<unknown>;
}
export declare function expect<T>(actual: T): Expect<T>;
export {};
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