/**
 * Check if the linestring is a boundary.
 * @param {Array<number>} flatCoordinates Flat coordinates.
 * @param {number} offset Offset.
 * @param {number} end End.
 * @param {number} stride Stride.
 * @return {boolean} The linestring is a boundary.
 */
export function lineStringIsClosed(flatCoordinates: number[], offset: number, end: number, stride: number): boolean;
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