/**
 * Calculates the moving average (simple or exponential) for a given dataset.
 *
 * @param data - The input array of objects containing the data to process.
 * @param sourceColumn - The key in each object from which to read the numeric value.
 * @param resultColumn - The key in each object where the calculated moving average will be stored.
 * @param windowSize - The number of periods to use for the moving average calculation. Defaults to 20.
 * @param type - The type of moving average to calculate: `'simple'` for Simple Moving Average (SMA), `'exponential'` for Exponential Moving Average (EMA). Defaults to `'simple'`.
 * @returns A new array of objects with the moving average values added to each object under `resultColumn`.
 *
 * @remarks
 * - For SMA, the result for the first `windowSize - 1` elements will be `null`.
 * - For EMA, the first valid value is used as the initial EMA.
 * - Non-numeric or invalid values in `sourceColumn` are skipped for SMA and carry forward the previous EMA for EMA.
 */
export declare function calculateMovingAverage(data: Array<Record<string, unknown>>, sourceColumn: string, resultColumn: string, windowSize?: number, type?: 'simple' | 'exponential'): Array<Record<string, unknown>>;
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