/**
 * The Savitzky-Golay weight matrix, and a bounded cache of recent ones.
 *
 * The matrix depends only on the window size, the polynomial order and the
 * derivative, never on the data, so it is a constant across a run of spectra.
 * Building one costs thousands of recursive `gramPoly` calls.
 */
/**
 * The weight matrix for a window, built once per shape rather than once per
 * call.
 *
 * Slots are compared on the three numbers, not on a key built from them, so
 * there is no string allocation per call. The caller must not mutate the
 * result.
 * @param windowSize - Number of points in the window.
 * @param polynomial - Polynomial grade.
 * @param derivative - Derivative order.
 * @returns The weight vectors, one per position in the window.
 */
export declare function cachedWeights(windowSize: number, polynomial: number, derivative: number): Float64Array[];
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