/**
 * Calculates rolling volatility (standard deviation) of returns over a specified window size.
 *
 * @param data - Array of data objects containing return values.
 * @param returnsColumn - The key in each data object representing the return value.
 * @param resultColumn - The key to store the calculated volatility in each data object.
 * @param windowSize - The number of periods to use for the rolling window (default is 20).
 * @param annualize - Whether to annualize the volatility (default is true, assumes 252 trading days per year).
 * @returns A new array of data objects with the calculated volatility added under `resultColumn`.
 *
 * @remarks
 * - If there are not enough data points to fill the window, the volatility is set to `null`.
 * - Only numeric and non-NaN return values are considered in the calculation.
 */
export declare function calculateVolatility(data: Array<Record<string, unknown>>, returnsColumn: string, resultColumn: string, windowSize?: number, annualize?: boolean): Array<Record<string, unknown>>;
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