/**
 * Calculates Bollinger Bands for a given dataset.
 *
 * Bollinger Bands consist of three lines: the middle band (simple moving average),
 * the upper band (SMA + N standard deviations), and the lower band (SMA - N standard deviations).
 *
 * @param data - Array of data objects to calculate Bollinger Bands for.
 * @param sourceColumn - The key in each data object containing the source value (e.g., closing price).
 * @param upperColumn - The key to store the calculated upper band value. Defaults to 'bb_upper'.
 * @param middleColumn - The key to store the calculated middle band (SMA) value. Defaults to 'bb_middle'.
 * @param lowerColumn - The key to store the calculated lower band value. Defaults to 'bb_lower'.
 * @param windowSize - The number of periods to use for the moving average and standard deviation. Defaults to 20.
 * @param numStdDev - The number of standard deviations to use for the upper and lower bands. Defaults to 2.
 * @returns A new array of data objects with Bollinger Bands columns added.
 */
export declare function calculateBollingerBands(data: Array<Record<string, unknown>>, sourceColumn: string, upperColumn?: string, middleColumn?: string, lowerColumn?: string, windowSize?: number, numStdDev?: number): Array<Record<string, unknown>>;
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