export interface JsError extends Error {
    toString?: () => string;
}
export interface AssertionError extends JsError {
    expected: any;
    actual: any;
    operator: string;
    showDiff?: boolean;
}
export interface HtmlDiffAssertionError extends JsError {
    diff: {
        expected: string;
        actual: string;
        comparison: string;
    };
    label: string;
}
export interface PprintAssertionError extends JsError {
    diff: {
        expected: string;
        actual: string;
    };
    toString: () => string;
}
export type TestError = JsError | AssertionError | PprintAssertionError | HtmlDiffAssertionError;
export declare const pprintAssertionError: (message: string, expected: string, actual: string) => PprintAssertionError;
export declare const isPprintAssertionError: (err: TestError) => err is PprintAssertionError;
export declare const isHTMLDiffError: (err: TestError) => err is HtmlDiffAssertionError;
export declare const isAssertionError: (err: TestError) => err is AssertionError;