diff --git a/turf/turf-test.ts b/turf/turf-test.ts
index 5a8501c74..a6bb7e2ac 100644
--- a/turf/turf-test.ts
+++ b/turf/turf-test.ts
@@ -215,10 +215,80 @@ var triangle = {
   }
 };
 
+var aggregations = [
+  {
+    aggregation: 'sum',
+    inField: 'population',
+    outField: 'pop_sum'
+  },
+  {
+    aggregation: 'average',
+    inField: 'population',
+    outField: 'pop_avg'
+  },
+  {
+    aggregation: 'median',
+    inField: 'population',
+    outField: 'pop_median'
+  },
+  {
+    aggregation: 'min',
+    inField: 'population',
+    outField: 'pop_min'
+  },
+  {
+    aggregation: 'max',
+    inField: 'population',
+    outField: 'pop_max'
+  },
+  {
+    aggregation: 'deviation',
+    inField: 'population',
+    outField: 'pop_deviation'
+  },
+  {
+    aggregation: 'variance',
+    inField: 'population',
+    outField: 'pop_variance'
+  },
+  {
+    aggregation: 'count',
+    inField: '',
+    outField: 'point_count'
+  }
+];
+
 //////////////////////////////////////////////////////////////////////////
 // Tests Aggregation
 //////////////////////////////////////////////////////////////////////////
 
+// -- Test aggregate --
+var aggregated = turf.aggregate(polygons, points, aggregations);
+
+// -- Test average --
+var averaged = turf.average(polygons, points, 'population', 'pop_avg');
+
+// -- Test count --
+var counted = turf.count(polygons, points, 'pt_count');
+
+// -- Test deviation --
+var deviated = turf.deviation(polygons, points, 'population', 'pop_deviation');
+
+// -- Test max --
+var aggregated = turf.max(polygons, points, 'population', 'max');
+
+// -- Test median --
+var medians = turf.median(polygons, points, 'population', 'median');
+
+// -- Test min --
+var minimums = turf.min(polygons, points, 'population', 'min');
+
+// -- Test sum --
+var summed = turf.sum(polygons, points, 'population', 'sum');
+
+// -- Test variance --
+var varianced = turf.variance(polygons, points, 'population', 'variance');
+
 //////////////////////////////////////////////////////////////////////////
 // Tests Measurement
 //////////////////////////////////////////////////////////////////////////
diff --git a/turf/turf.d.ts b/turf/turf.d.ts
index 0da75e33b..bbc84eac3 100644
--- a/turf/turf.d.ts
+++ b/turf/turf.d.ts
@@ -10,6 +10,94 @@ declare module turf {
     // Aggregation
     //////////////////////////////////////////////////////
 
+    /**
+    * Calculates a series of aggregations for a set of points within a set of polygons. Sum, average, count, min, max, and deviation are supported.
+    * @param polygons Polygons with values on which to aggregate
+    * @param points Points to be aggregated
+    * @param aggregations An array of aggregation objects
+    * @returns Polygons with properties listed based on outField values in aggregations
+    */
+    function aggregate(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, aggregations: Array<{aggregation: string, inField: string, outField: string}>): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the average value of a field for a set of points within a set of polygons.
+    * @param polygons Polygons with values on which to average
+    * @param points Points from which to calculate the average
+    * @param field The field in the points features from which to pull values to average
+    * @param outField The field in polygons to put results of the averages
+    * @returns Polygons with the value of outField set to the calculated averages
+    */
+    function average(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, field: string, outField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Takes a set of points and a set of polygons and calculates the number of points that fall within the set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param countField A field to append to the attributes of the Polygon features representing Point counts
+    * @returns Polygons with countField appended
+    */
+    function count(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, countField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the standard deviation value of a field for a set of points within a set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param inField The field in points from which to aggregate
+    * @param outField The field to append to polygons representing deviation
+    * @returns Polygons with appended field representing deviation
+    */
+    function deviation(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, inField: string, outField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the maximum value of a field for a set of points within a set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param inField The field in input data to analyze
+    * @param outField The field in which to store results
+    * @returns Polygons with properties listed as outField values
+    */
+    function max(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, inField: string, outField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the median value of a field for a set of points within a set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param inField The field in input data to analyze
+    * @param outField The field in which to store results
+    * @returns Polygons with properties listed as outField values
+    */
+    function median(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, inField: string, outField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the minimum value of a field for a set of points within a set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param inField The field in input data to analyze
+    * @param outField The field in which to store results
+    * @returns Polygons with properties listed as outField values
+    */
+    function min(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, inField: string, outField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the sum of a field for a set of points within a set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param inField The field in input data to analyze
+    * @param outField The field in which to store results
+    * @returns Polygons with properties listed as outField
+    */
+    function sum(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, inField: string, outField: string): GeoJSON.FeatureCollection;
+
+    /**
+    * Calculates the variance value of a field for a set of points within a set of polygons.
+    * @param polygons Input polygons
+    * @param points Input points
+    * @param inField The field in input data to analyze
+    * @param outField The field in which to store results
+    * @returns Polygons with properties listed as outField
+    */
+    function variance(polygons: GeoJSON.FeatureCollection, points: GeoJSON.FeatureCollection, inField: string, outField: string): GeoJSON.FeatureCollection;
+
     //////////////////////////////////////////////////////
     // Measurement
     //////////////////////////////////////////////////////