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newPoints.push(points[0]);\n for (var i = 1; i < secondToLast; i++) {\n var prevAddedPoint = newPoints[newPoints.length - 1];\n if (\n points[i][0] === prevAddedPoint[0] &&\n points[i][1] === prevAddedPoint[1]\n )\n continue;\n else {\n newPoints.push(points[i]);\n newPointsLength = newPoints.length;\n if (newPointsLength > 2) {\n if (\n isPointOnLineSegment(\n newPoints[newPointsLength - 3],\n newPoints[newPointsLength - 1],\n newPoints[newPointsLength - 2]\n )\n )\n newPoints.splice(newPoints.length - 2, 1);\n }\n }\n }\n newPoints.push(points[points.length - 1]);\n newPointsLength = newPoints.length;\n\n // (Multi)Polygons must have at least 4 points, but a closed LineString with only 3 points is acceptable\n if (\n (type === \"Polygon\" || type === \"MultiPolygon\") &&\n equals(points[0], points[points.length - 1]) &&\n newPointsLength < 4\n ) {\n throw new Error(\"invalid polygon\");\n }\n\n if (type === \"LineString\" && newPointsLength < 3) {\n return newPoints;\n }\n\n if (\n isPointOnLineSegment(\n newPoints[newPointsLength - 3],\n newPoints[newPointsLength - 1],\n newPoints[newPointsLength - 2]\n )\n )\n newPoints.splice(newPoints.length - 2, 1);\n\n return newPoints;\n}\n\n/**\n * Compares two points and returns if they are equals\n *\n * @private\n * @param {Position} pt1 point\n * @param {Position} pt2 point\n * @returns {boolean} true if they are equals\n */\nfunction equals(pt1: Position, pt2: Position) {\n return pt1[0] === pt2[0] && pt1[1] === pt2[1];\n}\n\n/**\n * Returns if `point` is on the segment between `start` and `end`.\n * Borrowed from `@turf/boolean-point-on-line` to speed up the evaluation (instead of using the module as dependency)\n *\n * @private\n * @param {Position} start coord pair of start of line\n * @param {Position} end coord pair of end of line\n * @param {Position} point coord pair of point to check\n * @returns {boolean} true/false\n */\nfunction isPointOnLineSegment(start: Position, end: Position, point: Position) {\n var 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