import type { PercentageOptions } from './types';
/**
 * * Performs a percentage-related calculation based on the given mode and inputs.
 *
 * - `get-percent`: Calculates what percentage the `part` is of the `total`.
 * - `get-value`: Calculates the value from a given `percentage` of a `total`.
 * - `get-original`: Calculates the original value from a known `value` and `percentage`.
 * - `get-change-percent`: Percent increase/decrease from `oldValue` to `newValue`.
 * - `apply-percent-change`: Applies increase/decrease by `percentage` to `baseValue`.
 * - `get-percent-difference`: Absolute percent difference between two values.
 * - `inverse-percent`: What percent `total` is of `part`.
 *
 * @param options - The calculation mode and inputs required for the operation.
 * @returns The calculated number rounded to three decimal places, or `NaN` if input is invalid.
 */
export declare function calculatePercentage(options: PercentageOptions): number;