export type TruncateOptions = {
    chars?: number;
    lines?: number;
    ending?: string;
};
export declare function truncate(val: any, opts: TruncateOptions): {
    truncated: boolean;
    result: string;
    lines: number;
};
export type AssertionLike = {
    source?: string;
    property?: string | null;
    comparison?: string;
    target?: unknown;
    regex?: string | null;
    error?: string | null;
    actual?: unknown;
};
export type FormatAssertionLineOptions = {
    truncate?: TruncateOptions;
};
export declare const assertionSymbols: {
    readonly success: "✔";
    readonly error: "✖";
};
export declare function formatAssertionLine(assertion: AssertionLike, options?: FormatAssertionLineOptions): string;