import type { BilinearInterpolationInput, BilinearInterpolationResult } from './types.js';
/**
 * Bilinear interpolation on a 2D grid z[xIndex][yIndex].
 *
 * @param input - Grid axes (x, y), values (z), and target point
 * @returns Interpolated value and extrapolation flag
 * @throws RangeError if x or y has fewer than 2 points, if z row count does not match x length,
 *   or if any z row length does not match y length
 */
export declare function bilinearInterpolation(input: BilinearInterpolationInput): BilinearInterpolationResult;
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