export declare function assertSuccess<T>(result: {
    success: boolean;
    data?: T;
    errors?: unknown;
}): asserts result is {
    success: true;
    data: T;
};
export declare function assertFailure(result: {
    success: boolean;
    data?: unknown;
    errors?: unknown;
}): asserts result is {
    success: false;
    errors: unknown;
};
export interface ApiResponse {
    message: string;
    status: number;
}
export declare function createMockJsonResponse(data: unknown, ok?: boolean, status?: number, statusText?: string): Response;
export declare function createMockTextResponse(text: string, contentType?: string): Response;
export declare function createMockBinaryResponse(data: ArrayBuffer): Response;
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