export declare function formatDuration(ms: number): string;
export declare function formatPercent(value: number): string;
export declare function formatInteger(value?: number): string;
export declare function formatTokens(value?: number): string;
export declare function formatRate(passed: number, total: number): string;
export declare function padCell(value: string, width: number): string;
export declare function visibleWidth(value: string): number;
export declare function getSymbols(isUnicode: boolean): {
    pass: string;
    fail: string;
    bullet: string;
    warning: string;
};