{"version":3,"sources":["../../index.ts"],"sourcesContent":["import { Feature, FeatureCollection, GeoJsonProperties, Point } from \"geojson\";\nimport { Coord, Units } from \"@turf/helpers\";\nimport { clone } from \"@turf/clone\";\nimport { distance } from \"@turf/distance\";\nimport { featureEach } from \"@turf/meta\";\n\ninterface NearestPoint<P extends GeoJsonProperties = GeoJsonProperties>\n  extends Feature<Point> {\n  properties: {\n    featureIndex: number;\n    distanceToPoint: number;\n  } & P;\n}\n\n/**\n * Takes a reference {@link Point|point} and a FeatureCollection of Features\n * with Point geometries and returns the\n * point from the FeatureCollection closest to the reference. This calculation\n * is geodesic.\n *\n * @function\n * @param {Coord} targetPoint the reference point\n * @param {FeatureCollection<Point>} points against input point set\n * @param {Object} [options={}] Optional parameters\n * @param {Units} [options.units='kilometers'] the units of the numeric result. Supports all valid Turf {@link https://turfjs.org/docs/api/types/Units Units}.\n * @returns {Feature<Point>} the closest point in the set to the reference point\n * @example\n * var targetPoint = turf.point([28.965797, 41.010086], {\"marker-color\": \"#0F0\"});\n * var points = turf.featureCollection([\n *     turf.point([28.973865, 41.011122]),\n *     turf.point([28.948459, 41.024204]),\n *     turf.point([28.938674, 41.013324])\n * ]);\n *\n * var nearest = turf.nearestPoint(targetPoint, points);\n *\n * //addToMap\n * var addToMap = [targetPoint, points, nearest];\n * nearest.properties['marker-color'] = '#F00';\n */\nfunction nearestPoint<P extends GeoJsonProperties = GeoJsonProperties>(\n  targetPoint: Coord,\n  points: FeatureCollection<Point, P>,\n  options: {\n    units?: Units;\n  } = {}\n): NearestPoint<P> {\n  // Input validation\n  if (!targetPoint) throw new Error(\"targetPoint is required\");\n  if (!points) throw new Error(\"points is required\");\n\n  let minDist = Infinity;\n  let bestFeatureIndex = 0;\n  featureEach(points, (pt, featureIndex) => {\n    const distanceToPoint = distance(targetPoint, pt, options);\n    if (distanceToPoint < minDist) {\n      bestFeatureIndex = featureIndex;\n      minDist = distanceToPoint;\n    }\n  });\n  const nearestPoint = clone(points.features[bestFeatureIndex]);\n\n  return {\n    ...nearestPoint,\n    properties: {\n      ...nearestPoint.properties,\n      featureIndex: bestFeatureIndex,\n      distanceToPoint: minDist,\n    },\n  };\n}\n\nexport { nearestPoint, NearestPoint };\nexport default nearestPoint;\n"],"mappings":";;;;;;;;;;;;;;;;;;;;;AAEA,SAAS,aAAa;AACtB,SAAS,gBAAgB;AACzB,SAAS,mBAAmB;AAoC5B,SAAS,aACP,aACA,QACA,UAEI,CAAC,GACY;AAEjB,MAAI,CAAC,YAAa,OAAM,IAAI,MAAM,yBAAyB;AAC3D,MAAI,CAAC,OAAQ,OAAM,IAAI,MAAM,oBAAoB;AAEjD,MAAI,UAAU;AACd,MAAI,mBAAmB;AACvB,cAAY,QAAQ,CAAC,IAAI,iBAAiB;AACxC,UAAM,kBAAkB,SAAS,aAAa,IAAI,OAAO;AACzD,QAAI,kBAAkB,SAAS;AAC7B,yBAAmB;AACnB,gBAAU;AAAA,IACZ;AAAA,EACF,CAAC;AACD,QAAMA,gBAAe,MAAM,OAAO,SAAS,gBAAgB,CAAC;AAE5D,SAAO,iCACFA,gBADE;AAAA,IAEL,YAAY,iCACPA,cAAa,aADN;AAAA,MAEV,cAAc;AAAA,MACd,iBAAiB;AAAA,IACnB;AAAA,EACF;AACF;AAGA,IAAO,gBAAQ;","names":["nearestPoint"]}