index.js

var s2 = require('./build/Release/_s2.node');
module.exports = s2;

s2.S2LatLng.prototype.toGeoJSON = function() {
    return {
        type: 'Point',
        coordinates: [this.lng, this.lat]
    };
};

s2.S2Cell.prototype.toGeoJSON = function() {
    var vs = [];
    for (var i = 0; i < 4; i++) {
        vs.push(new s2.S2LatLng(this.getVertex(i)));
    }
    vs.push(new s2.S2LatLng(this.getVertex(0)));
    return {
        type: 'Polygon',
        coordinates: [
            vs.map(function(v) {
                return [v.lng, v.lat];
            })
        ]
    };
};

s2.S2LatLngRect.prototype.toGeoJSON = function() {
    var vs = [];
    for (var i = 0; i < 4; i++) {
        vs.push(this.getVertex(i));
    }
    vs.push(this.getVertex(0));
    return {
        type: 'Polygon',
        coordinates: [
            [
                vs.map(function(v) {
                    return [v.lng, v.lat];
                })
            ]
        ]
    };
};

s2.S2Point.prototype.toArray = function() {
    return [this.x(), this.y(), this.z()];
};

s2.S2Point.prototype.toString = function() {
    return this.toArray().toString();
};