/**
 * Provides the temperature of the water to be added to a mash to achieve an
 * initial infusion temperature. This will not do calculations for subsequent
 * infusions.
 * @param {number} waterGrainRatio The ratio of water to grains in qts to lbs.
 * for example 1.5 on a batch of 10lb of grain means that you intend to add
 * 15 qts (3.75 gallons) of water to the mash with the grains.
 * @param {number} targetTemperature Intended temperature (in degrees
 * fahrenheit) of mash after initial infusion.
 * infusion.
 * @param {number} grainTemperature The temperature of the grains (in degrees
 * fahrenheit) that will be added to the mash. If none are supplied it will
 * default to room temperature (72 F).
 * @returns infusion temperature in degrees fahrenheit
 */
export default function infusionTemperature(waterGrainRatio: number, targetTemperature: number, grainTemperature?: number): number;