/**
 * Calculates the original gravity (e.x. 1.050) given the gravity points,
 * volume, and efficiency.
 * @param {number} gravityPoints The total number of gravity points from all
 * the grains, extract, and adjuncts. Please note that this is gravity points
 * and not a gravity value. For example 1.050 would not be correct but 50 would be.
 * @param {number} volume Volume of the batch in gallons.
 * @param {number} mashEfficiency Percentage efficiency of the total brewhouse efficiency.
 * For extract brewing use 100.
 * @returns {number} original gravity of a volume of wart given the gravity points of
 * the grains provided for a given mash efficiency.
 */
export default function originalGravity(gravityPoints: number, volume: number, mashEfficiency?: number): number;