export interface TestHookOptions {
    description?: string;
    stdout?: string | boolean;
    stderr?: string | boolean;
    exit?: number;
    root?: string;
}
export declare type TestHookCallback<T> = (output: T & {
    error?: Error;
}) => Promise<void> | void;
export interface TestHook {
    (event: string, hookOpts: object, opts: TestHookOptions & {
        stdout: true;
        stderr: true;
    }, fn: TestHookCallback<{
        stdout: string;
        stderr: string;
    }>): void;
    (event: string, hookOpts: object, opts: TestHookOptions & {
        stdout: true;
    }, fn: TestHookCallback<{
        stdout: string;
    }>): void;
    (event: string, hookOpts: object, opts: TestHookOptions & {
        stderr: true;
    }, fn: TestHookCallback<{
        stderr: string;
    }>): void;
    (event: string, hookOpts?: object, opts?: TestHookOptions, fn?: TestHookCallback<{}>): void;
}
export declare const testHook: TestHook;