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{ feature, lineString } from '@turf/helpers';\n\n/**\n * Callback for coordEach\n *\n * @callback coordEachCallback\n * @param {Array<number>} currentCoord The current coordinate being processed.\n * @param {number} coordIndex The current index of the coordinate being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.\n * @param {number} geometryIndex The current index of the Geometry being processed.\n */\n\n/**\n * Iterate over coordinates in any GeoJSON object, similar to Array.forEach()\n *\n * @name coordEach\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (currentCoord, coordIndex, featureIndex, multiFeatureIndex)\n * @param {boolean} [excludeWrapCoord=false] whether or not to include the final coordinate of LinearRings that wraps the ring in its iteration.\n * @example\n * var features = turf.featureCollection([\n *   turf.point([26, 37], {\"foo\": \"bar\"}),\n *   turf.point([36, 53], {\"hello\": \"world\"})\n * ]);\n *\n * turf.coordEach(features, function (currentCoord, coordIndex, featureIndex, multiFeatureIndex, geometryIndex) {\n *   //=currentCoord\n *   //=coordIndex\n *   //=featureIndex\n *   //=multiFeatureIndex\n *   //=geometryIndex\n * });\n */\nfunction coordEach(geojson, callback, excludeWrapCoord) {\n    // Handles null Geometry -- Skips this GeoJSON\n    if (geojson === null) return;\n    var j, k, l, geometry, stopG, coords,\n        geometryMaybeCollection,\n        wrapShrink = 0,\n        coordIndex = 0,\n        isGeometryCollection,\n        type = geojson.type,\n        isFeatureCollection = type === 'FeatureCollection',\n        isFeature = type === 'Feature',\n        stop = isFeatureCollection ? geojson.features.length : 1;\n\n    // This logic may look a little weird. The reason why it is that way\n    // is because it's trying to be fast. GeoJSON supports multiple kinds\n    // of objects at its root: FeatureCollection, Features, Geometries.\n    // This function has the responsibility of handling all of them, and that\n    // means that some of the `for` loops you see below actually just don't apply\n    // to certain inputs. For instance, if you give this just a\n    // Point geometry, then both loops are short-circuited and all we do\n    // is gradually rename the input until it's called 'geometry'.\n    //\n    // This also aims to allocate as few resources as possible: just a\n    // few numbers and booleans, rather than any temporary arrays as would\n    // be required with the normalization approach.\n    for (var featureIndex = 0; featureIndex < stop; featureIndex++) {\n        geometryMaybeCollection = (isFeatureCollection ? geojson.features[featureIndex].geometry :\n            (isFeature ? geojson.geometry : geojson));\n        isGeometryCollection = (geometryMaybeCollection) ? geometryMaybeCollection.type === 'GeometryCollection' : false;\n        stopG = isGeometryCollection ? geometryMaybeCollection.geometries.length : 1;\n\n        for (var geomIndex = 0; geomIndex < stopG; geomIndex++) {\n            var multiFeatureIndex = 0;\n            var geometryIndex = 0;\n            geometry = isGeometryCollection ?\n                geometryMaybeCollection.geometries[geomIndex] : geometryMaybeCollection;\n\n            // Handles null Geometry -- Skips this geometry\n            if (geometry === null) continue;\n            coords = geometry.coordinates;\n            var geomType = geometry.type;\n\n            wrapShrink = (excludeWrapCoord && (geomType === 'Polygon' || geomType === 'MultiPolygon')) ? 1 : 0;\n\n            switch (geomType) {\n            case null:\n                break;\n            case 'Point':\n                callback(coords, coordIndex, featureIndex, multiFeatureIndex, geometryIndex);\n                coordIndex++;\n                multiFeatureIndex++;\n                break;\n            case 'LineString':\n            case 'MultiPoint':\n                for (j = 0; j < coords.length; j++) {\n                    callback(coords[j], coordIndex, featureIndex, multiFeatureIndex, geometryIndex);\n                    coordIndex++;\n                    if (geomType === 'MultiPoint') multiFeatureIndex++;\n                }\n                if (geomType === 'LineString') multiFeatureIndex++;\n                break;\n            case 'Polygon':\n            case 'MultiLineString':\n                for (j = 0; j < coords.length; j++) {\n                    for (k = 0; k < coords[j].length - wrapShrink; k++) {\n                        callback(coords[j][k], coordIndex, featureIndex, multiFeatureIndex, geometryIndex);\n                        coordIndex++;\n                    }\n                    if (geomType === 'MultiLineString') multiFeatureIndex++;\n                    if (geomType === 'Polygon') geometryIndex++;\n                }\n                if (geomType === 'Polygon') multiFeatureIndex++;\n                break;\n            case 'MultiPolygon':\n                for (j = 0; j < coords.length; j++) {\n                    if (geomType === 'MultiPolygon') geometryIndex = 0;\n                    for (k = 0; k < coords[j].length; k++) {\n                        for (l = 0; l < coords[j][k].length - wrapShrink; l++) {\n                            callback(coords[j][k][l], coordIndex, featureIndex, multiFeatureIndex, geometryIndex);\n                            coordIndex++;\n                        }\n                        geometryIndex++;\n                    }\n                    multiFeatureIndex++;\n                }\n                break;\n            case 'GeometryCollection':\n                for (j = 0; j < geometry.geometries.length; j++)\n                    coordEach(geometry.geometries[j], callback, excludeWrapCoord);\n                break;\n            default:\n                throw new Error('Unknown Geometry Type');\n            }\n        }\n    }\n}\n\n/**\n * Callback for coordReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback coordReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {Array<number>} currentCoord The current coordinate being processed.\n * @param {number} coordIndex The current index of the coordinate being processed.\n * Starts at index 0, if an initialValue is provided, and at index 1 otherwise.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.\n * @param {number} geometryIndex The current index of the Geometry being processed.\n */\n\n/**\n * Reduce coordinates in any GeoJSON object, similar to Array.reduce()\n *\n * @name coordReduce\n * @param {FeatureCollection|Geometry|Feature} geojson any GeoJSON object\n * @param {Function} callback a method that takes (previousValue, currentCoord, coordIndex)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @param {boolean} [excludeWrapCoord=false] whether or not to include the final coordinate of LinearRings that wraps the ring in its iteration.\n * @returns {*} The value that results from the reduction.\n * @example\n * var features = turf.featureCollection([\n *   turf.point([26, 37], {\"foo\": \"bar\"}),\n *   turf.point([36, 53], {\"hello\": \"world\"})\n * ]);\n *\n * turf.coordReduce(features, function (previousValue, currentCoord, coordIndex, featureIndex, multiFeatureIndex, geometryIndex) {\n *   //=previousValue\n *   //=currentCoord\n *   //=coordIndex\n *   //=featureIndex\n *   //=multiFeatureIndex\n *   //=geometryIndex\n *   return currentCoord;\n * });\n */\nfunction coordReduce(geojson, callback, initialValue, excludeWrapCoord) {\n    var previousValue = initialValue;\n    coordEach(geojson, function (currentCoord, coordIndex, featureIndex, multiFeatureIndex, geometryIndex) {\n        if (coordIndex === 0 && initialValue === undefined) previousValue = currentCoord;\n        else previousValue = callback(previousValue, currentCoord, coordIndex, featureIndex, multiFeatureIndex, geometryIndex);\n    }, excludeWrapCoord);\n    return previousValue;\n}\n\n/**\n * Callback for propEach\n *\n * @callback propEachCallback\n * @param {Object} currentProperties The current Properties being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n */\n\n/**\n * Iterate over properties in any GeoJSON object, similar to Array.forEach()\n *\n * @name propEach\n * @param {FeatureCollection|Feature} geojson any GeoJSON object\n * @param {Function} callback a method that takes (currentProperties, featureIndex)\n * @example\n * var features = turf.featureCollection([\n *     turf.point([26, 37], {foo: 'bar'}),\n *     turf.point([36, 53], {hello: 'world'})\n * ]);\n *\n * turf.propEach(features, function (currentProperties, featureIndex) {\n *   //=currentProperties\n *   //=featureIndex\n * });\n */\nfunction propEach(geojson, callback) {\n    var i;\n    switch (geojson.type) {\n    case 'FeatureCollection':\n        for (i = 0; i < geojson.features.length; i++) {\n            callback(geojson.features[i].properties, i);\n        }\n        break;\n    case 'Feature':\n        callback(geojson.properties, 0);\n        break;\n    }\n}\n\n\n/**\n * Callback for propReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback propReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {*} currentProperties The current Properties being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n */\n\n/**\n * Reduce properties in any GeoJSON object into a single value,\n * similar to how Array.reduce works. However, in this case we lazily run\n * the reduction, so an array of all properties is unnecessary.\n *\n * @name propReduce\n * @param {FeatureCollection|Feature} geojson any GeoJSON object\n * @param {Function} callback a method that takes (previousValue, currentProperties, featureIndex)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @returns {*} The value that results from the reduction.\n * @example\n * var features = turf.featureCollection([\n *     turf.point([26, 37], {foo: 'bar'}),\n *     turf.point([36, 53], {hello: 'world'})\n * ]);\n *\n * turf.propReduce(features, function (previousValue, currentProperties, featureIndex) {\n *   //=previousValue\n *   //=currentProperties\n *   //=featureIndex\n *   return currentProperties\n * });\n */\nfunction propReduce(geojson, callback, initialValue) {\n    var previousValue = initialValue;\n    propEach(geojson, function (currentProperties, featureIndex) {\n        if (featureIndex === 0 && initialValue === undefined) previousValue = currentProperties;\n        else previousValue = callback(previousValue, currentProperties, featureIndex);\n    });\n    return previousValue;\n}\n\n/**\n * Callback for featureEach\n *\n * @callback featureEachCallback\n * @param {Feature<any>} currentFeature The current Feature being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n */\n\n/**\n * Iterate over features in any GeoJSON object, similar to\n * Array.forEach.\n *\n * @name featureEach\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (currentFeature, featureIndex)\n * @example\n * var features = turf.featureCollection([\n *   turf.point([26, 37], {foo: 'bar'}),\n *   turf.point([36, 53], {hello: 'world'})\n * ]);\n *\n * turf.featureEach(features, function (currentFeature, featureIndex) {\n *   //=currentFeature\n *   //=featureIndex\n * });\n */\nfunction featureEach(geojson, callback) {\n    if (geojson.type === 'Feature') {\n        callback(geojson, 0);\n    } else if (geojson.type === 'FeatureCollection') {\n        for (var i = 0; i < geojson.features.length; i++) {\n            callback(geojson.features[i], i);\n        }\n    }\n}\n\n/**\n * Callback for featureReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback featureReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {Feature} currentFeature The current Feature being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n */\n\n/**\n * Reduce features in any GeoJSON object, similar to Array.reduce().\n *\n * @name featureReduce\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (previousValue, currentFeature, featureIndex)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @returns {*} The value that results from the reduction.\n * @example\n * var features = turf.featureCollection([\n *   turf.point([26, 37], {\"foo\": \"bar\"}),\n *   turf.point([36, 53], {\"hello\": \"world\"})\n * ]);\n *\n * turf.featureReduce(features, function (previousValue, currentFeature, featureIndex) {\n *   //=previousValue\n *   //=currentFeature\n *   //=featureIndex\n *   return currentFeature\n * });\n */\nfunction featureReduce(geojson, callback, initialValue) {\n    var previousValue = initialValue;\n    featureEach(geojson, function (currentFeature, featureIndex) {\n        if (featureIndex === 0 && initialValue === undefined) previousValue = currentFeature;\n        else previousValue = callback(previousValue, currentFeature, featureIndex);\n    });\n    return previousValue;\n}\n\n/**\n * Get all coordinates from any GeoJSON object.\n *\n * @name coordAll\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @returns {Array<Array<number>>} coordinate position array\n * @example\n * var features = turf.featureCollection([\n *   turf.point([26, 37], {foo: 'bar'}),\n *   turf.point([36, 53], {hello: 'world'})\n * ]);\n *\n * var coords = turf.coordAll(features);\n * //= [[26, 37], [36, 53]]\n */\nfunction coordAll(geojson) {\n    var coords = [];\n    coordEach(geojson, function (coord) {\n        coords.push(coord);\n    });\n    return coords;\n}\n\n/**\n * Callback for geomEach\n *\n * @callback geomEachCallback\n * @param {Geometry} currentGeometry The current Geometry being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {Object} featureProperties The current Feature Properties being processed.\n * @param {Array<number>} featureBBox The current Feature BBox being processed.\n * @param {number|string} featureId The current Feature Id being processed.\n */\n\n/**\n * Iterate over each geometry in any GeoJSON object, similar to Array.forEach()\n *\n * @name geomEach\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (currentGeometry, featureIndex, featureProperties, featureBBox, featureId)\n * @example\n * var features = turf.featureCollection([\n *     turf.point([26, 37], {foo: 'bar'}),\n *     turf.point([36, 53], {hello: 'world'})\n * ]);\n *\n * turf.geomEach(features, function (currentGeometry, featureIndex, featureProperties, featureBBox, featureId) {\n *   //=currentGeometry\n *   //=featureIndex\n *   //=featureProperties\n *   //=featureBBox\n *   //=featureId\n * });\n */\nfunction geomEach(geojson, callback) {\n    var i, j, g, geometry, stopG,\n        geometryMaybeCollection,\n        isGeometryCollection,\n        featureProperties,\n        featureBBox,\n        featureId,\n        featureIndex = 0,\n        isFeatureCollection = geojson.type === 'FeatureCollection',\n        isFeature = geojson.type === 'Feature',\n        stop = isFeatureCollection ? geojson.features.length : 1;\n\n    // This logic may look a little weird. The reason why it is that way\n    // is because it's trying to be fast. GeoJSON supports multiple kinds\n    // of objects at its root: FeatureCollection, Features, Geometries.\n    // This function has the responsibility of handling all of them, and that\n    // means that some of the `for` loops you see below actually just don't apply\n    // to certain inputs. For instance, if you give this just a\n    // Point geometry, then both loops are short-circuited and all we do\n    // is gradually rename the input until it's called 'geometry'.\n    //\n    // This also aims to allocate as few resources as possible: just a\n    // few numbers and booleans, rather than any temporary arrays as would\n    // be required with the normalization approach.\n    for (i = 0; i < stop; i++) {\n\n        geometryMaybeCollection = (isFeatureCollection ? geojson.features[i].geometry :\n            (isFeature ? geojson.geometry : geojson));\n        featureProperties = (isFeatureCollection ? geojson.features[i].properties :\n            (isFeature ? geojson.properties : {}));\n        featureBBox = (isFeatureCollection ? geojson.features[i].bbox :\n            (isFeature ? geojson.bbox : undefined));\n        featureId = (isFeatureCollection ? geojson.features[i].id :\n            (isFeature ? geojson.id : undefined));\n        isGeometryCollection = (geometryMaybeCollection) ? geometryMaybeCollection.type === 'GeometryCollection' : false;\n        stopG = isGeometryCollection ? geometryMaybeCollection.geometries.length : 1;\n\n        for (g = 0; g < stopG; g++) {\n            geometry = isGeometryCollection ?\n                geometryMaybeCollection.geometries[g] : geometryMaybeCollection;\n\n            // Handle null Geometry\n            if (geometry === null) {\n                callback(null, featureIndex, featureProperties, featureBBox, featureId);\n                continue;\n            }\n            switch (geometry.type) {\n            case 'Point':\n            case 'LineString':\n            case 'MultiPoint':\n            case 'Polygon':\n            case 'MultiLineString':\n            case 'MultiPolygon': {\n                callback(geometry, featureIndex, featureProperties, featureBBox, featureId);\n                break;\n            }\n            case 'GeometryCollection': {\n                for (j = 0; j < geometry.geometries.length; j++) {\n                    callback(geometry.geometries[j], featureIndex, featureProperties, featureBBox, featureId);\n                }\n                break;\n            }\n            default:\n                throw new Error('Unknown Geometry Type');\n            }\n        }\n        // Only increase `featureIndex` per each feature\n        featureIndex++;\n    }\n}\n\n/**\n * Callback for geomReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback geomReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {Geometry} currentGeometry The current Geometry being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {Object} featureProperties The current Feature Properties being processed.\n * @param {Array<number>} featureBBox The current Feature BBox being processed.\n * @param {number|string} featureId The current Feature Id being processed.\n */\n\n/**\n * Reduce geometry in any GeoJSON object, similar to Array.reduce().\n *\n * @name geomReduce\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @returns {*} The value that results from the reduction.\n * @example\n * var features = turf.featureCollection([\n *     turf.point([26, 37], {foo: 'bar'}),\n *     turf.point([36, 53], {hello: 'world'})\n * ]);\n *\n * turf.geomReduce(features, function (previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId) {\n *   //=previousValue\n *   //=currentGeometry\n *   //=featureIndex\n *   //=featureProperties\n *   //=featureBBox\n *   //=featureId\n *   return currentGeometry\n * });\n */\nfunction geomReduce(geojson, callback, initialValue) {\n    var previousValue = initialValue;\n    geomEach(geojson, function (currentGeometry, featureIndex, featureProperties, featureBBox, featureId) {\n        if (featureIndex === 0 && initialValue === undefined) previousValue = currentGeometry;\n        else previousValue = callback(previousValue, currentGeometry, featureIndex, featureProperties, featureBBox, featureId);\n    });\n    return previousValue;\n}\n\n/**\n * Callback for flattenEach\n *\n * @callback flattenEachCallback\n * @param {Feature} currentFeature The current flattened feature being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.\n */\n\n/**\n * Iterate over flattened features in any GeoJSON object, similar to\n * Array.forEach.\n *\n * @name flattenEach\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (currentFeature, featureIndex, multiFeatureIndex)\n * @example\n * var features = turf.featureCollection([\n *     turf.point([26, 37], {foo: 'bar'}),\n *     turf.multiPoint([[40, 30], [36, 53]], {hello: 'world'})\n * ]);\n *\n * turf.flattenEach(features, function (currentFeature, featureIndex, multiFeatureIndex) {\n *   //=currentFeature\n *   //=featureIndex\n *   //=multiFeatureIndex\n * });\n */\nfunction flattenEach(geojson, callback) {\n    geomEach(geojson, function (geometry, featureIndex, properties, bbox, id) {\n        // Callback for single geometry\n        var type = (geometry === null) ? null : geometry.type;\n        switch (type) {\n        case null:\n        case 'Point':\n        case 'LineString':\n        case 'Polygon':\n            callback(feature(geometry, properties, {bbox: bbox, id: id}), featureIndex, 0);\n            return;\n        }\n\n        var geomType;\n\n        // Callback for multi-geometry\n        switch (type) {\n        case 'MultiPoint':\n            geomType = 'Point';\n            break;\n        case 'MultiLineString':\n            geomType = 'LineString';\n            break;\n        case 'MultiPolygon':\n            geomType = 'Polygon';\n            break;\n        }\n\n        geometry.coordinates.forEach(function (coordinate, multiFeatureIndex) {\n            var geom = {\n                type: geomType,\n                coordinates: coordinate\n            };\n            callback(feature(geom, properties), featureIndex, multiFeatureIndex);\n        });\n\n    });\n}\n\n/**\n * Callback for flattenReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback flattenReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {Feature} currentFeature The current Feature being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.\n */\n\n/**\n * Reduce flattened features in any GeoJSON object, similar to Array.reduce().\n *\n * @name flattenReduce\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON object\n * @param {Function} callback a method that takes (previousValue, currentFeature, featureIndex, multiFeatureIndex)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @returns {*} The value that results from the reduction.\n * @example\n * var features = turf.featureCollection([\n *     turf.point([26, 37], {foo: 'bar'}),\n *     turf.multiPoint([[40, 30], [36, 53]], {hello: 'world'})\n * ]);\n *\n * turf.flattenReduce(features, function (previousValue, currentFeature, featureIndex, multiFeatureIndex) {\n *   //=previousValue\n *   //=currentFeature\n *   //=featureIndex\n *   //=multiFeatureIndex\n *   return currentFeature\n * });\n */\nfunction flattenReduce(geojson, callback, initialValue) {\n    var previousValue = initialValue;\n    flattenEach(geojson, function (currentFeature, featureIndex, multiFeatureIndex) {\n        if (featureIndex === 0 && multiFeatureIndex === 0 && initialValue === undefined) previousValue = currentFeature;\n        else previousValue = callback(previousValue, currentFeature, featureIndex, multiFeatureIndex);\n    });\n    return previousValue;\n}\n\n/**\n * Callback for segmentEach\n *\n * @callback segmentEachCallback\n * @param {Feature<LineString>} currentSegment The current Segment being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.\n * @param {number} geometryIndex The current index of the Geometry being processed.\n * @param {number} segmentIndex The current index of the Segment being processed.\n * @returns {void}\n */\n\n/**\n * Iterate over 2-vertex line segment in any GeoJSON object, similar to Array.forEach()\n * (Multi)Point geometries do not contain segments therefore they are ignored during this operation.\n *\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON\n * @param {Function} callback a method that takes (currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex)\n * @returns {void}\n * @example\n * var polygon = turf.polygon([[[-50, 5], [-40, -10], [-50, -10], [-40, 5], [-50, 5]]]);\n *\n * // Iterate over GeoJSON by 2-vertex segments\n * turf.segmentEach(polygon, function (currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex) {\n *   //=currentSegment\n *   //=featureIndex\n *   //=multiFeatureIndex\n *   //=geometryIndex\n *   //=segmentIndex\n * });\n *\n * // Calculate the total number of segments\n * var total = 0;\n * turf.segmentEach(polygon, function () {\n *     total++;\n * });\n */\nfunction segmentEach(geojson, callback) {\n    flattenEach(geojson, function (feature$$1, featureIndex, multiFeatureIndex) {\n        var segmentIndex = 0;\n\n        // Exclude null Geometries\n        if (!feature$$1.geometry) return;\n        // (Multi)Point geometries do not contain segments therefore they are ignored during this operation.\n        var type = feature$$1.geometry.type;\n        if (type === 'Point' || type === 'MultiPoint') return;\n\n        // Generate 2-vertex line segments\n        coordReduce(feature$$1, function (previousCoords, currentCoord, coordIndex, featureIndexCoord, mutliPartIndexCoord, geometryIndex) {\n            var currentSegment = lineString([previousCoords, currentCoord], feature$$1.properties);\n            callback(currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex);\n            segmentIndex++;\n            return currentCoord;\n        });\n    });\n}\n\n/**\n * Callback for segmentReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback segmentReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {Feature<LineString>} currentSegment The current Segment being processed.\n * @param {number} featureIndex The current index of the Feature being processed.\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed.\n * @param {number} geometryIndex The current index of the Geometry being processed.\n * @param {number} segmentIndex The current index of the Segment being processed.\n */\n\n/**\n * Reduce 2-vertex line segment in any GeoJSON object, similar to Array.reduce()\n * (Multi)Point geometries do not contain segments therefore they are ignored during this operation.\n *\n * @param {FeatureCollection|Feature|Geometry} geojson any GeoJSON\n * @param {Function} callback a method that takes (previousValue, currentSegment, currentIndex)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @returns {void}\n * @example\n * var polygon = turf.polygon([[[-50, 5], [-40, -10], [-50, -10], [-40, 5], [-50, 5]]]);\n *\n * // Iterate over GeoJSON by 2-vertex segments\n * turf.segmentReduce(polygon, function (previousSegment, currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex) {\n *   //= previousSegment\n *   //= currentSegment\n *   //= featureIndex\n *   //= multiFeatureIndex\n *   //= geometryIndex\n *   //= segmentInex\n *   return currentSegment\n * });\n *\n * // Calculate the total number of segments\n * var initialValue = 0\n * var total = turf.segmentReduce(polygon, function (previousValue) {\n *     previousValue++;\n *     return previousValue;\n * }, initialValue);\n */\nfunction segmentReduce(geojson, callback, initialValue) {\n    var previousValue = initialValue;\n    var started = false;\n    segmentEach(geojson, function (currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex) {\n        if (started === false && initialValue === undefined) previousValue = currentSegment;\n        else previousValue = callback(previousValue, currentSegment, featureIndex, multiFeatureIndex, geometryIndex, segmentIndex);\n        started = true;\n    });\n    return previousValue;\n}\n\n/**\n * Callback for lineEach\n *\n * @callback lineEachCallback\n * @param {Feature<LineString>} currentLine The current LineString|LinearRing being processed\n * @param {number} featureIndex The current index of the Feature being processed\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed\n * @param {number} geometryIndex The current index of the Geometry being processed\n */\n\n/**\n * Iterate over line or ring coordinates in LineString, Polygon, MultiLineString, MultiPolygon Features or Geometries,\n * similar to Array.forEach.\n *\n * @name lineEach\n * @param {Geometry|Feature<LineString|Polygon|MultiLineString|MultiPolygon>} geojson object\n * @param {Function} callback a method that takes (currentLine, featureIndex, multiFeatureIndex, geometryIndex)\n * @example\n * var multiLine = turf.multiLineString([\n *   [[26, 37], [35, 45]],\n *   [[36, 53], [38, 50], [41, 55]]\n * ]);\n *\n * turf.lineEach(multiLine, function (currentLine, featureIndex, multiFeatureIndex, geometryIndex) {\n *   //=currentLine\n *   //=featureIndex\n *   //=multiFeatureIndex\n *   //=geometryIndex\n * });\n */\nfunction lineEach(geojson, callback) {\n    // validation\n    if (!geojson) throw new Error('geojson is required');\n\n    flattenEach(geojson, function (feature$$1, featureIndex, multiFeatureIndex) {\n        if (feature$$1.geometry === null) return;\n        var type = feature$$1.geometry.type;\n        var coords = feature$$1.geometry.coordinates;\n        switch (type) {\n        case 'LineString':\n            callback(feature$$1, featureIndex, multiFeatureIndex, 0, 0);\n            break;\n        case 'Polygon':\n            for (var geometryIndex = 0; geometryIndex < coords.length; geometryIndex++) {\n                callback(lineString(coords[geometryIndex], feature$$1.properties), featureIndex, multiFeatureIndex, geometryIndex);\n            }\n            break;\n        }\n    });\n}\n\n/**\n * Callback for lineReduce\n *\n * The first time the callback function is called, the values provided as arguments depend\n * on whether the reduce method has an initialValue argument.\n *\n * If an initialValue is provided to the reduce method:\n *  - The previousValue argument is initialValue.\n *  - The currentValue argument is the value of the first element present in the array.\n *\n * If an initialValue is not provided:\n *  - The previousValue argument is the value of the first element present in the array.\n *  - The currentValue argument is the value of the second element present in the array.\n *\n * @callback lineReduceCallback\n * @param {*} previousValue The accumulated value previously returned in the last invocation\n * of the callback, or initialValue, if supplied.\n * @param {Feature<LineString>} currentLine The current LineString|LinearRing being processed.\n * @param {number} featureIndex The current index of the Feature being processed\n * @param {number} multiFeatureIndex The current index of the Multi-Feature being processed\n * @param {number} geometryIndex The current index of the Geometry being processed\n */\n\n/**\n * Reduce features in any GeoJSON object, similar to Array.reduce().\n *\n * @name lineReduce\n * @param {Geometry|Feature<LineString|Polygon|MultiLineString|MultiPolygon>} geojson object\n * @param {Function} callback a method that takes (previousValue, currentLine, featureIndex, multiFeatureIndex, geometryIndex)\n * @param {*} [initialValue] Value to use as the first argument to the first call of the callback.\n * @returns {*} The value that results from the reduction.\n * @example\n * var multiPoly = turf.multiPolygon([\n *   turf.polygon([[[12,48],[2,41],[24,38],[12,48]], [[9,44],[13,41],[13,45],[9,44]]]),\n *   turf.polygon([[[5, 5], [0, 0], [2, 2], [4, 4], [5, 5]]])\n * ]);\n *\n * turf.lineReduce(multiPoly, function (previousValue, currentLine, featureIndex, multiFeatureIndex, geometryIndex) {\n *   //=previousValue\n *   //=currentLine\n *   //=featureIndex\n *   //=multiFeatureIndex\n *   //=geometryIndex\n *   return currentLine\n * });\n */\nfunction lineReduce(geojson, callback, initialValue) {\n    var previousValue = initialValue;\n    lineEach(geojson, function (currentLine, featureIndex, multiFeatureIndex, geometryIndex) {\n        if (featureIndex === 0 && initialValue === undefined) previousValue = currentLine;\n        else previousValue = callback(previousValue, currentLine, featureIndex, multiFeatureIndex, geometryIndex);\n    });\n    return previousValue;\n}\n\nexport { coordEach, coordReduce, propEach, propReduce, featureEach, featureReduce, coordAll, geomEach, geomReduce, flattenEach, flattenReduce, segmentEach, segmentReduce, lineEach, lineReduce };\n","import { coordEach } from '@turf/meta';\n\n/**\n * Takes a set of features, calculates the bbox of all input features, and returns a bounding box.\n *\n * @name bbox\n * @param {GeoJSON} geojson any GeoJSON object\n * @returns {BBox} bbox extent in [minX, minY, maxX, maxY] order\n * @example\n * var line = turf.lineString([[-74, 40], [-78, 42], [-82, 35]]);\n * var bbox = turf.bbox(line);\n * var bboxPolygon = turf.bboxPolygon(bbox);\n *\n * //addToMap\n * var addToMap = [line, bboxPolygon]\n */\nfunction bbox(geojson) {\n    var BBox = [Infinity, Infinity, -Infinity, -Infinity];\n    coordEach(geojson, function (coord) {\n        if (BBox[0] > coord[0]) BBox[0] = coord[0];\n        if (BBox[1] > coord[1]) BBox[1] = coord[1];\n        if (BBox[2] < coord[0]) BBox[2] = coord[0];\n        if (BBox[3] < coord[1]) BBox[3] = coord[1];\n    });\n    return BBox;\n}\n\nexport default bbox;\n","/**\n * Earth Radius used with the Harvesine formula and approximates using a spherical (non-ellipsoid) Earth.\n */\nvar earthRadius = 6371008.8;\n\n/**\n * Unit of measurement factors using a spherical (non-ellipsoid) earth radius.\n */\nvar factors = {\n    meters: earthRadius,\n    metres: earthRadius,\n    millimeters: earthRadius * 1000,\n    millimetres: earthRadius * 1000,\n    centimeters: earthRadius * 100,\n    centimetres: earthRadius * 100,\n    kilometers: earthRadius / 1000,\n    kilometres: earthRadius / 1000,\n    miles: earthRadius / 1609.344,\n    nauticalmiles: earthRadius / 1852,\n    inches: earthRadius * 39.370,\n    yards: earthRadius / 1.0936,\n    feet: earthRadius * 3.28084,\n    radians: 1,\n    degrees: earthRadius / 111325,\n};\n\n/**\n * Units of measurement factors based on 1 meter.\n */\nvar unitsFactors = {\n    meters: 1,\n    metres: 1,\n    millimeters: 1000,\n    millimetres: 1000,\n    centimeters: 100,\n    centimetres: 100,\n    kilometers: 1 / 1000,\n    kilometres: 1 / 1000,\n    miles: 1 / 1609.344,\n    nauticalmiles: 1 / 1852,\n    inches: 39.370,\n    yards: 1 / 1.0936,\n    feet: 3.28084,\n    radians: 1 / earthRadius,\n    degrees: 1 / 111325,\n};\n\n/**\n * Area of measurement factors based on 1 square meter.\n */\nvar areaFactors = {\n    meters: 1,\n    metres: 1,\n    millimeters: 1000000,\n    millimetres: 1000000,\n    centimeters: 10000,\n    centimetres: 10000,\n    kilometers: 0.000001,\n    kilometres: 0.000001,\n    acres: 0.000247105,\n    miles: 3.86e-7,\n    yards: 1.195990046,\n    feet: 10.763910417,\n    inches: 1550.003100006\n};\n\n/**\n * Wraps a GeoJSON {@link Geometry} in a GeoJSON {@link Feature}.\n *\n * @name feature\n * @param {Geometry} geometry input geometry\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature} a GeoJSON Feature\n * @example\n * var geometry = {\n *   \"type\": \"Point\",\n *   \"coordinates\": [110, 50]\n * };\n *\n * var feature = turf.feature(geometry);\n *\n * //=feature\n */\nfunction feature(geometry, properties, options) {\n    // Optional Parameters\n    options = options || {};\n    if (!isObject(options)) throw new Error('options is invalid');\n    var bbox = options.bbox;\n    var id = options.id;\n\n    // Validation\n    if (geometry === undefined) throw new Error('geometry is required');\n    if (properties && properties.constructor !== Object) throw new Error('properties must be an Object');\n    if (bbox) validateBBox(bbox);\n    if (id) validateId(id);\n\n    // Main\n    var feat = {type: 'Feature'};\n    if (id) feat.id = id;\n    if (bbox) feat.bbox = bbox;\n    feat.properties = properties || {};\n    feat.geometry = geometry;\n    return feat;\n}\n\n/**\n * Creates a GeoJSON {@link Geometry} from a Geometry string type & coordinates.\n * For GeometryCollection type use `helpers.geometryCollection`\n *\n * @name geometry\n * @param {string} type Geometry Type\n * @param {Array<number>} coordinates Coordinates\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Geometry\n * @returns {Geometry} a GeoJSON Geometry\n * @example\n * var type = 'Point';\n * var coordinates = [110, 50];\n *\n * var geometry = turf.geometry(type, coordinates);\n *\n * //=geometry\n */\nfunction geometry(type, coordinates, options) {\n    // Optional Parameters\n    options = options || {};\n    if (!isObject(options)) throw new Error('options is invalid');\n    var bbox = options.bbox;\n\n    // Validation\n    if (!type) throw new Error('type is required');\n    if (!coordinates) throw new Error('coordinates is required');\n    if (!Array.isArray(coordinates)) throw new Error('coordinates must be an Array');\n    if (bbox) validateBBox(bbox);\n\n    // Main\n    var geom;\n    switch (type) {\n    case 'Point': geom = point(coordinates).geometry; break;\n    case 'LineString': geom = lineString(coordinates).geometry; break;\n    case 'Polygon': geom = polygon(coordinates).geometry; break;\n    case 'MultiPoint': geom = multiPoint(coordinates).geometry; break;\n    case 'MultiLineString': geom = multiLineString(coordinates).geometry; break;\n    case 'MultiPolygon': geom = multiPolygon(coordinates).geometry; break;\n    default: throw new Error(type + ' is invalid');\n    }\n    if (bbox) geom.bbox = bbox;\n    return geom;\n}\n\n/**\n * Creates a {@link Point} {@link Feature} from a Position.\n *\n * @name point\n * @param {Array<number>} coordinates longitude, latitude position (each in decimal degrees)\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<Point>} a Point feature\n * @example\n * var point = turf.point([-75.343, 39.984]);\n *\n * //=point\n */\nfunction point(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n    if (!Array.isArray(coordinates)) throw new Error('coordinates must be an Array');\n    if (coordinates.length < 2) throw new Error('coordinates must be at least 2 numbers long');\n    if (!isNumber(coordinates[0]) || !isNumber(coordinates[1])) throw new Error('coordinates must contain numbers');\n\n    return feature({\n        type: 'Point',\n        coordinates: coordinates\n    }, properties, options);\n}\n\n/**\n * Creates a {@link Point} {@link FeatureCollection} from an Array of Point coordinates.\n *\n * @name points\n * @param {Array<Array<number>>} coordinates an array of Points\n * @param {Object} [properties={}] Translate these properties to each Feature\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the FeatureCollection\n * @param {string|number} [options.id] Identifier associated with the FeatureCollection\n * @returns {FeatureCollection<Point>} Point Feature\n * @example\n * var points = turf.points([\n *   [-75, 39],\n *   [-80, 45],\n *   [-78, 50]\n * ]);\n *\n * //=points\n */\nfunction points(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n    if (!Array.isArray(coordinates)) throw new Error('coordinates must be an Array');\n\n    return featureCollection(coordinates.map(function (coords) {\n        return point(coords, properties);\n    }), options);\n}\n\n/**\n * Creates a {@link Polygon} {@link Feature} from an Array of LinearRings.\n *\n * @name polygon\n * @param {Array<Array<Array<number>>>} coordinates an array of LinearRings\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<Polygon>} Polygon Feature\n * @example\n * var polygon = turf.polygon([[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]], { name: 'poly1' });\n *\n * //=polygon\n */\nfunction polygon(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n\n    for (var i = 0; i < coordinates.length; i++) {\n        var ring = coordinates[i];\n        if (ring.length < 4) {\n            throw new Error('Each LinearRing of a Polygon must have 4 or more Positions.');\n        }\n        for (var j = 0; j < ring[ring.length - 1].length; j++) {\n            // Check if first point of Polygon contains two numbers\n            if (i === 0 && j === 0 && !isNumber(ring[0][0]) || !isNumber(ring[0][1])) throw new Error('coordinates must contain numbers');\n            if (ring[ring.length - 1][j] !== ring[0][j]) {\n                throw new Error('First and last Position are not equivalent.');\n            }\n        }\n    }\n\n    return feature({\n        type: 'Polygon',\n        coordinates: coordinates\n    }, properties, options);\n}\n\n/**\n * Creates a {@link Polygon} {@link FeatureCollection} from an Array of Polygon coordinates.\n *\n * @name polygons\n * @param {Array<Array<Array<Array<number>>>>} coordinates an array of Polygon coordinates\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the FeatureCollection\n * @returns {FeatureCollection<Polygon>} Polygon FeatureCollection\n * @example\n * var polygons = turf.polygons([\n *   [[[-5, 52], [-4, 56], [-2, 51], [-7, 54], [-5, 52]]],\n *   [[[-15, 42], [-14, 46], [-12, 41], [-17, 44], [-15, 42]]],\n * ]);\n *\n * //=polygons\n */\nfunction polygons(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n    if (!Array.isArray(coordinates)) throw new Error('coordinates must be an Array');\n\n    return featureCollection(coordinates.map(function (coords) {\n        return polygon(coords, properties);\n    }), options);\n}\n\n/**\n * Creates a {@link LineString} {@link Feature} from an Array of Positions.\n *\n * @name lineString\n * @param {Array<Array<number>>} coordinates an array of Positions\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<LineString>} LineString Feature\n * @example\n * var linestring1 = turf.lineString([[-24, 63], [-23, 60], [-25, 65], [-20, 69]], {name: 'line 1'});\n * var linestring2 = turf.lineString([[-14, 43], [-13, 40], [-15, 45], [-10, 49]], {name: 'line 2'});\n *\n * //=linestring1\n * //=linestring2\n */\nfunction lineString(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n    if (coordinates.length < 2) throw new Error('coordinates must be an array of two or more positions');\n    // Check if first point of LineString contains two numbers\n    if (!isNumber(coordinates[0][1]) || !isNumber(coordinates[0][1])) throw new Error('coordinates must contain numbers');\n\n    return feature({\n        type: 'LineString',\n        coordinates: coordinates\n    }, properties, options);\n}\n\n/**\n * Creates a {@link LineString} {@link FeatureCollection} from an Array of LineString coordinates.\n *\n * @name lineStrings\n * @param {Array<Array<number>>} coordinates an array of LinearRings\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the FeatureCollection\n * @param {string|number} [options.id] Identifier associated with the FeatureCollection\n * @returns {FeatureCollection<LineString>} LineString FeatureCollection\n * @example\n * var linestrings = turf.lineStrings([\n *   [[-24, 63], [-23, 60], [-25, 65], [-20, 69]],\n *   [[-14, 43], [-13, 40], [-15, 45], [-10, 49]]\n * ]);\n *\n * //=linestrings\n */\nfunction lineStrings(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n    if (!Array.isArray(coordinates)) throw new Error('coordinates must be an Array');\n\n    return featureCollection(coordinates.map(function (coords) {\n        return lineString(coords, properties);\n    }), options);\n}\n\n/**\n * Takes one or more {@link Feature|Features} and creates a {@link FeatureCollection}.\n *\n * @name featureCollection\n * @param {Feature[]} features input features\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {FeatureCollection} FeatureCollection of Features\n * @example\n * var locationA = turf.point([-75.343, 39.984], {name: 'Location A'});\n * var locationB = turf.point([-75.833, 39.284], {name: 'Location B'});\n * var locationC = turf.point([-75.534, 39.123], {name: 'Location C'});\n *\n * var collection = turf.featureCollection([\n *   locationA,\n *   locationB,\n *   locationC\n * ]);\n *\n * //=collection\n */\nfunction featureCollection(features, options) {\n    // Optional Parameters\n    options = options || {};\n    if (!isObject(options)) throw new Error('options is invalid');\n    var bbox = options.bbox;\n    var id = options.id;\n\n    // Validation\n    if (!features) throw new Error('No features passed');\n    if (!Array.isArray(features)) throw new Error('features must be an Array');\n    if (bbox) validateBBox(bbox);\n    if (id) validateId(id);\n\n    // Main\n    var fc = {type: 'FeatureCollection'};\n    if (id) fc.id = id;\n    if (bbox) fc.bbox = bbox;\n    fc.features = features;\n    return fc;\n}\n\n/**\n * Creates a {@link Feature<MultiLineString>} based on a\n * coordinate array. Properties can be added optionally.\n *\n * @name multiLineString\n * @param {Array<Array<Array<number>>>} coordinates an array of LineStrings\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<MultiLineString>} a MultiLineString feature\n * @throws {Error} if no coordinates are passed\n * @example\n * var multiLine = turf.multiLineString([[[0,0],[10,10]]]);\n *\n * //=multiLine\n */\nfunction multiLineString(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n\n    return feature({\n        type: 'MultiLineString',\n        coordinates: coordinates\n    }, properties, options);\n}\n\n/**\n * Creates a {@link Feature<MultiPoint>} based on a\n * coordinate array. Properties can be added optionally.\n *\n * @name multiPoint\n * @param {Array<Array<number>>} coordinates an array of Positions\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<MultiPoint>} a MultiPoint feature\n * @throws {Error} if no coordinates are passed\n * @example\n * var multiPt = turf.multiPoint([[0,0],[10,10]]);\n *\n * //=multiPt\n */\nfunction multiPoint(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n\n    return feature({\n        type: 'MultiPoint',\n        coordinates: coordinates\n    }, properties, options);\n}\n\n/**\n * Creates a {@link Feature<MultiPolygon>} based on a\n * coordinate array. Properties can be added optionally.\n *\n * @name multiPolygon\n * @param {Array<Array<Array<Array<number>>>>} coordinates an array of Polygons\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<MultiPolygon>} a multipolygon feature\n * @throws {Error} if no coordinates are passed\n * @example\n * var multiPoly = turf.multiPolygon([[[[0,0],[0,10],[10,10],[10,0],[0,0]]]]);\n *\n * //=multiPoly\n *\n */\nfunction multiPolygon(coordinates, properties, options) {\n    if (!coordinates) throw new Error('coordinates is required');\n\n    return feature({\n        type: 'MultiPolygon',\n        coordinates: coordinates\n    }, properties, options);\n}\n\n/**\n * Creates a {@link Feature<GeometryCollection>} based on a\n * coordinate array. Properties can be added optionally.\n *\n * @name geometryCollection\n * @param {Array<Geometry>} geometries an array of GeoJSON Geometries\n * @param {Object} [properties={}] an Object of key-value pairs to add as properties\n * @param {Object} [options={}] Optional Parameters\n * @param {Array<number>} [options.bbox] Bounding Box Array [west, south, east, north] associated with the Feature\n * @param {string|number} [options.id] Identifier associated with the Feature\n * @returns {Feature<GeometryCollection>} a GeoJSON GeometryCollection Feature\n * @example\n * var pt = {\n *     \"type\": \"Point\",\n *       \"coordinates\": [100, 0]\n *     };\n * var line = {\n *     \"type\": \"LineString\",\n *     \"coordinates\": [ [101, 0], [102, 1] ]\n *   };\n * var collection = turf.geometryCollection([pt, line]);\n *\n * //=collection\n */\nfunction geometryCollection(geometries, properties, options) {\n    if (!geometries) throw new Error('geometries is required');\n    if (!Array.isArray(geometries)) throw new Error('geometries must be an Array');\n\n    return feature({\n        type: 'GeometryCollection',\n        geometries: geometries\n    }, properties, options);\n}\n\n/**\n * Round number to precision\n *\n * @param {number} num Number\n * @param {number} [precision=0] Precision\n * @returns {number} rounded number\n * @example\n * turf.round(120.4321)\n * //=120\n *\n * turf.round(120.4321, 2)\n * //=120.43\n */\nfunction round(num, precision) {\n    if (num === undefined || num === null || isNaN(num)) throw new Error('num is required');\n    if (precision && !(precision >= 0)) throw new Error('precision must be a positive number');\n    var multiplier = Math.pow(10, precision || 0);\n    return Math.round(num * multiplier) / multiplier;\n}\n\n/**\n * Convert a distance measurement (assuming a spherical Earth) from radians to a more friendly unit.\n * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet\n *\n * @name radiansToLength\n * @param {number} radians in radians across the sphere\n * @param {string} [units='kilometers'] can be degrees, radians, miles, or kilometers inches, yards, metres, meters, kilometres, kilometers.\n * @returns {number} distance\n */\nfunction radiansToLength(radians, units) {\n    if (radians === undefined || radians === null) throw new Error('radians is required');\n\n    if (units && typeof units !== 'string') throw new Error('units must be a string');\n    var factor = factors[units || 'kilometers'];\n    if (!factor) throw new Error(units + ' units is invalid');\n    return radians * factor;\n}\n\n/**\n * Convert a distance measurement (assuming a spherical Earth) from a real-world unit into radians\n * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet\n *\n * @name lengthToRadians\n * @param {number} distance in real units\n * @param {string} [units='kilometers'] can be degrees, radians, miles, or kilometers inches, yards, metres, meters, kilometres, kilometers.\n * @returns {number} radians\n */\nfunction lengthToRadians(distance, units) {\n    if (distance === undefined || distance === null) throw new Error('distance is required');\n\n    if (units && typeof units !== 'string') throw new Error('units must be a string');\n    var factor = factors[units || 'kilometers'];\n    if (!factor) throw new Error(units + ' units is invalid');\n    return distance / factor;\n}\n\n/**\n * Convert a distance measurement (assuming a spherical Earth) from a real-world unit into degrees\n * Valid units: miles, nauticalmiles, inches, yards, meters, metres, centimeters, kilometres, feet\n *\n * @name lengthToDegrees\n * @param {number} distance in real units\n * @param {string} [units='kilometers'] can be degrees, radians, miles, or kilometers inches, yards, metres, meters, kilometres, kilometers.\n * @returns {number} degrees\n */\nfunction lengthToDegrees(distance, units) {\n    return radiansToDegrees(lengthToRadians(distance, units));\n}\n\n/**\n * Converts any bearing angle from the north line direction (positive clockwise)\n * and returns an angle between 0-360 degrees (positive clockwise), 0 being the north line\n *\n * @name bearingToAzimuth\n * @param {number} bearing angle, between -180 and +180 degrees\n * @returns {number} angle between 0 and 360 degrees\n */\nfunction bearingToAzimuth(bearing) {\n    if (bearing === null || bearing === undefined) throw new Error('bearing is required');\n\n    var angle = bearing % 360;\n    if (angle < 0) angle += 360;\n    return angle;\n}\n\n/**\n * Converts an angle in radians to degrees\n *\n * @name radiansToDegrees\n * @param {number} radians angle in radians\n * @returns {number} degrees between 0 and 360 degrees\n */\nfunction radiansToDegrees(radians) {\n    if (radians === null || radians === undefined) throw new Error('radians is required');\n\n    var degrees = radians % (2 * Math.PI);\n    return degrees * 180 / Math.PI;\n}\n\n/**\n * Converts an angle in degrees to radians\n *\n * @name degreesToRadians\n * @param {number} degrees angle between 0 and 360 degrees\n * @returns {number} angle in radians\n */\nfunction degreesToRadians(degrees) {\n    if (degrees === null || degrees === undefined) throw new Error('degrees is required');\n\n    var radians = degrees % 360;\n    return radians * Math.PI / 180;\n}\n\n/**\n * Converts a length to the requested unit.\n * Valid units: miles, nauticalmiles, inches, yards, meters, metres, kilometers, centimeters, feet\n *\n * @param {number} length to be converted\n * @param {string} originalUnit of the length\n * @param {string} [finalUnit='kilometers'] returned unit\n * @returns {number} the converted length\n */\nfunction convertLength(length, originalUnit, finalUnit) {\n    if (length === null || length === undefined) throw new Error('length is required');\n    if (!(length >= 0)) throw new Error('length must be a positive number');\n\n    return radiansToLength(lengthToRadians(length, originalUnit), finalUnit || 'kilometers');\n}\n\n/**\n * Converts a area to the requested unit.\n * Valid units: kilometers, kilometres, meters, metres, centimetres, millimeters, acres, miles, yards, feet, inches\n * @param {number} area to be converted\n * @param {string} [originalUnit='meters'] of the distance\n * @param {string} [finalUnit='kilometers'] returned unit\n * @returns {number} the converted distance\n */\nfunction convertArea(area, originalUnit, finalUnit) {\n    if (area === null || area === undefined) throw new Error('area is required');\n    if (!(area >= 0)) throw new Error('area must be a positive number');\n\n    var startFactor = areaFactors[originalUnit || 'meters'];\n    if (!startFactor) throw new Error('invalid original units');\n\n    var finalFactor = areaFactors[finalUnit || 'kilometers'];\n    if (!finalFactor) throw new Error('invalid final units');\n\n    return (area / startFactor) * finalFactor;\n}\n\n/**\n * isNumber\n *\n * @param {*} num Number to validate\n * @returns {boolean} true/false\n * @example\n * turf.isNumber(123)\n * //=true\n * turf.isNumber('foo')\n * //=false\n */\nfunction isNumber(num) {\n    return !isNaN(num) && num !== null && !Array.isArray(num);\n}\n\n/**\n * isObject\n *\n * @param {*} input variable to validate\n * @returns {boolean} true/false\n * @example\n * turf.isObject({elevation: 10})\n * //=true\n * turf.isObject('foo')\n * //=false\n */\nfunction isObject(input) {\n    return (!!input) && (input.constructor === Object);\n}\n\n/**\n * Validate BBox\n *\n * @private\n * @param {Array<number>} bbox BBox to validate\n * @returns {void}\n * @throws Error if BBox is not valid\n * @example\n * validateBBox([-180, -40, 110, 50])\n * //=OK\n * validateBBox([-180, -40])\n * //=Error\n * validateBBox('Foo')\n * //=Error\n * validateBBox(5)\n * //=Error\n * validateBBox(null)\n * //=Error\n * validateBBox(undefined)\n * //=Error\n */\nfunction validateBBox(bbox) {\n    if (!bbox) throw new Error('bbox is required');\n    if (!Array.isArray(bbox)) throw new Error('bbox must be an Array');\n    if (bbox.length !== 4 && bbox.length !== 6) throw new Error('bbox must be an Array of 4 or 6 numbers');\n    bbox.forEach(function (num) {\n        if (!isNumber(num)) throw new Error('bbox must only contain numbers');\n    });\n}\n\n/**\n * Validate Id\n *\n * @private\n * @param {string|number} id Id to validate\n * @returns {void}\n * @throws Error if Id is not valid\n * @example\n * validateId([-180, -40, 110, 50])\n * //=Error\n * validateId([-180, -40])\n * //=Error\n * validateId('Foo')\n * //=OK\n * validateId(5)\n * //=OK\n * validateId(null)\n * //=Error\n * validateId(undefined)\n * //=Error\n */\nfunction validateId(id) {\n    if (!id) throw new Error('id is required');\n    if (['string', 'number'].indexOf(typeof id) === -1) throw new Error('id must be a number or a string');\n}\n\n// Deprecated methods\nfunction radians2degrees() {\n    throw new Error('method has been renamed to `radiansToDegrees`');\n}\n\nfunction degrees2radians() {\n    throw new Error('method has been renamed to `degreesToRadians`');\n}\n\nfunction distanceToDegrees() {\n    throw new Error('method has been renamed to `lengthToDegrees`');\n}\n\nfunction distanceToRadians() {\n    throw new Error('method has been renamed to `lengthToRadians`');\n}\n\nfunction radiansToDistance() {\n    throw new Error('method has been renamed to `radiansToLength`');\n}\n\nfunction bearingToAngle() {\n    throw new Error('method has been renamed to `bearingToAzimuth`');\n}\n\nfunction convertDistance() {\n    throw new Error('method has been renamed to `convertLength`');\n}\n\nexport { earthRadius, factors, unitsFactors, areaFactors, feature, geometry, point, points, polygon, polygons, lineString, lineStrings, featureCollection, multiLineString, multiPoint, multiPolygon, geometryCollection, round, radiansToLength, lengthToRadians, lengthToDegrees, bearingToAzimuth, radiansToDegrees, degreesToRadians, convertLength, convertArea, isNumber, isObject, validateBBox, validateId, radians2degrees, degrees2radians, distanceToDegrees, distanceToRadians, radiansToDistance, bearingToAngle, convertDistance };\n","import bbox from '@turf/bbox';\nimport { isObject, point } from '@turf/helpers';\n\n/**\n * Takes a {@link Feature} or {@link FeatureCollection} and returns the absolute center point of all features.\n *\n * @name center\n * @param {GeoJSON} geojson GeoJSON to be centered\n * @param {Object} [options={}] Optional parameters\n * @param {Object} [options.properties={}] an Object that is used as the {@link Feature}'s properties\n * @returns {Feature<Point>} a Point feature at the absolute center point of all input features\n * @example\n * var features = turf.featureCollection([\n *   turf.point( [-97.522259, 35.4691]),\n *   turf.point( [-97.502754, 35.463455]),\n *   turf.point( [-97.508269, 35.463245])\n * ]);\n *\n * var center = turf.center(features);\n *\n * //addToMap\n * var addToMap = [features, center]\n * center.properties['marker-size'] = 'large';\n * center.properties['marker-color'] = '#000';\n */\nfunction center(geojson, options) {\n    // Optional parameters\n    options = options || {};\n    if (!isObject(options)) throw new Error('options is invalid');\n    var properties = options.properties;\n\n    // Input validation\n    if (!geojson) throw new Error('geojson is required');\n\n    var ext = bbox(geojson);\n    var x = (ext[0] + ext[2]) / 2;\n    var y = (ext[1] + ext[3]) / 2;\n    return point([x, y], properties);\n}\n\nexport default center;\n"],"sourceRoot":""}