import type { Chart } from "gcm-database/ongeki";
export declare function getMaxPlatinumScore(chart: Chart): number;
/**
 * Get the amount of platinum stars given a platinum score ratio.
 *
 * @param starRatio Ratio between achieved and maximum platinum score, from 0 to 1.
 */
export declare function getStar(starRatio: number): 1 | 0 | 3 | 4 | -1 | 2 | 5;