From db993b21c452ba673d9490e4e317f30ef4ab91ee Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Sun, 16 Apr 2017 11:18:50 -0400
Subject: [PATCH 1/4] Implement polygon-offset

---
 packages/turf-buffer/bench.js                 |   13 +
 packages/turf-buffer/index.js                 |   28 +-
 packages/turf-buffer/package.json             |    3 +-
 .../out/feature-collection-points.geojson     |  264 +-
 .../out/geometry-collection-points.geojson    |  260 +-
 .../turf-buffer/test/out/linestring.geojson   |  604 ++-
 .../test/out/multi-linestring.geojson         | 2738 +++++++++----
 .../turf-buffer/test/out/multi-point.geojson  |  654 ++--
 .../test/out/multi-polygon.geojson            | 3384 ++++++++++++++---
 .../test/out/north-latitude-points.geojson    |   40 +-
 .../test/out/northern-polygon.geojson         | 1004 ++++-
 .../test/out/polygon-with-holes.geojson       |  996 ++++-
 12 files changed, 7897 insertions(+), 2091 deletions(-)

diff --git a/packages/turf-buffer/bench.js b/packages/turf-buffer/bench.js
index 023dd96f1c..3acbc6cf2e 100644
--- a/packages/turf-buffer/bench.js
+++ b/packages/turf-buffer/bench.js
@@ -16,6 +16,19 @@ const fixtures = fs.readdirSync(directory).map(filename => {
 /**
  * Benchmark Results
  *
+ * ==polygon-offset:after==
+ * feature-collection-points x 6,905 ops/sec ±16.80% (70 runs sampled)
+ * geometry-collection-points x 7,682 ops/sec ±9.08% (75 runs sampled)
+ * linestring x 404 ops/sec ±1.54% (85 runs sampled)
+ * multi-linestring x 117 ops/sec ±1.43% (73 runs sampled)
+ * multi-point x 1,406 ops/sec ±17.23% (81 runs sampled)
+ * multi-polygon x 38.88 ops/sec ±1.21% (51 runs sampled)
+ * north-latitude-points x 552 ops/sec ±1.24% (84 runs sampled)
+ * northern-polygon x 215 ops/sec ±2.45% (81 runs sampled)
+ * point x 36,843 ops/sec ±6.75% (80 runs sampled)
+ * polygon-with-holes x 74.91 ops/sec ±7.91% (63 runs sampled)
+ *
+ * ==jsts:before ==
  * feature-collection-points x 9,335 ops/sec ±1.37% (88 runs sampled)
  * geometry-collection-points x 9,505 ops/sec ±1.57% (86 runs sampled)
  * linestring x 7,977 ops/sec ±17.93% (75 runs sampled)
diff --git a/packages/turf-buffer/index.js b/packages/turf-buffer/index.js
index b3a99924cc..8af45140f0 100644
--- a/packages/turf-buffer/index.js
+++ b/packages/turf-buffer/index.js
@@ -1,12 +1,14 @@
-var jsts = require('jsts');
+var Offset = require('polygon-offset');
 var helpers = require('@turf/helpers');
 var circle = require('@turf/circle');
 var dissolve = require('@turf/dissolve');
 var meta = require('@turf/meta');
+var getCoords = require('@turf/invariant').getCoords;
 var coordEach = meta.coordEach;
 var featureEach = meta.featureEach;
 var featureCollection = helpers.featureCollection;
 var distanceToDegrees = helpers.distanceToDegrees;
+var polygon = helpers.polygon;
 var point = helpers.point;
 
 /**
@@ -69,15 +71,23 @@ module.exports = function (geojson, radius, units, steps) {
  * @returns {Feature<Polygon|MultiPolygon>} buffered feature
  */
 function buffer(feature, radius, units, steps) {
+    // validation
+    if (steps <= 0) throw new Error('steps must be greater than 0');
+
+    // default params
     var properties = feature.properties || {};
     var distance = distanceToDegrees(radius, units);
     var geometry = (feature.type === 'Feature') ? feature.geometry : feature;
+    var coords = getCoords(feature);
+
+    // Polygon-offset has issues when arcSegments is greater than 32
+    var offset = new Offset(coords, (steps > 32) ? 32 : steps);
 
     switch (geometry.type) {
     case 'Point':
-        var poly = circle(feature, radius, steps, units);
-        poly.properties = properties;
-        return poly;
+        var pointBuffer = circle(feature, radius, steps, units);
+        pointBuffer.properties = properties;
+        return pointBuffer;
     case 'MultiPoint':
         var polys = [];
         coordEach(feature, function (coord) {
@@ -88,14 +98,12 @@ function buffer(feature, radius, units, steps) {
         return dissolve(featureCollection(polys));
     case 'LineString':
     case 'MultiLineString':
+        var lineBuffer = offset.offsetLine(distance);
+        return polygon(lineBuffer, properties);
     case 'Polygon':
     case 'MultiPolygon':
-        var reader = new jsts.io.GeoJSONReader();
-        var geom = reader.read(geometry);
-        var buffered = geom.buffer(distance);
-        var writer = new jsts.io.GeoJSONWriter();
-        buffered = writer.write(buffered);
-        return helpers.feature(buffered, properties);
+        var polyBuffer = offset.margin(distance);
+        return polygon(polyBuffer, properties);
     default:
         throw new Error('geometry type ' + geometry.type + ' not supported');
     }
diff --git a/packages/turf-buffer/package.json b/packages/turf-buffer/package.json
index 1c89e6abc4..fca3716d90 100644
--- a/packages/turf-buffer/package.json
+++ b/packages/turf-buffer/package.json
@@ -46,7 +46,8 @@
     "@turf/circle": "^4.1.0",
     "@turf/dissolve": "^4.1.0",
     "@turf/helpers": "^4.1.0",
+    "@turf/invariant": "^4.1.0",
     "@turf/meta": "^4.1.0",
-    "jsts": "1.3.0"
+    "polygon-offset": "^0.3.1"
   }
 }
diff --git a/packages/turf-buffer/test/out/feature-collection-points.geojson b/packages/turf-buffer/test/out/feature-collection-points.geojson
index 2aab3decf1..fb4da8bb8e 100644
--- a/packages/turf-buffer/test/out/feature-collection-points.geojson
+++ b/packages/turf-buffer/test/out/feature-collection-points.geojson
@@ -9,263 +9,263 @@
 				"coordinates": [
 					[
 						[
-							135,
+							125,
 							-24.276568
 						],
 						[
-							135.077787,
+							125.077787,
 							-24.280032
 						],
 						[
-							135.154838,
+							125.154838,
 							-24.290389
 						],
 						[
-							135.230423,
+							125.230423,
 							-24.307542
 						],
 						[
-							135.303826,
+							125.303826,
 							-24.331329
 						],
 						[
-							135.374348,
+							125.374348,
 							-24.361523
 						],
 						[
-							135.441321,
+							125.441321,
 							-24.397839
 						],
 						[
-							135.504104,
+							125.504104,
 							-24.439933
 						],
 						[
-							135.562097,
+							125.562097,
 							-24.487403
 						],
 						[
-							135.614744,
+							125.614744,
 							-24.539799
 						],
 						[
-							135.661536,
+							125.661536,
 							-24.596623
 						],
 						[
-							135.702019,
+							125.702019,
 							-24.657332
 						],
 						[
-							135.735798,
+							125.735798,
 							-24.721347
 						],
 						[
-							135.76254,
+							125.76254,
 							-24.788057
 						],
 						[
-							135.781976,
+							125.781976,
 							-24.856823
 						],
 						[
-							135.793908,
+							125.793908,
 							-24.926985
 						],
 						[
-							135.798209,
+							125.798209,
 							-24.99787
 						],
 						[
-							135.794825,
+							125.794825,
 							-25.068796
 						],
 						[
-							135.783774,
+							125.783774,
 							-25.13908
 						],
 						[
-							135.76515,
+							125.76515,
 							-25.208042
 						],
 						[
-							135.739121,
+							125.739121,
 							-25.275017
 						],
 						[
-							135.705927,
+							125.705927,
 							-25.339355
 						],
 						[
-							135.665878,
+							125.665878,
 							-25.400432
 						],
 						[
-							135.619353,
+							125.619353,
 							-25.457655
 						],
 						[
-							135.566797,
+							125.566797,
 							-25.510467
 						],
 						[
-							135.508713,
+							125.508713,
 							-25.558353
 						],
 						[
-							135.445663,
+							125.445663,
 							-25.600846
 						],
 						[
-							135.378256,
+							125.378256,
 							-25.63753
 						],
 						[
-							135.307149,
+							125.307149,
 							-25.668047
 						],
 						[
-							135.233035,
+							125.233035,
 							-25.692099
 						],
 						[
-							135.156637,
+							125.156637,
 							-25.709449
 						],
 						[
-							135.078704,
+							125.078704,
 							-25.719927
 						],
 						[
-							135,
+							125,
 							-25.723432
 						],
 						[
-							134.921296,
+							124.921296,
 							-25.719927
 						],
 						[
-							134.843363,
+							124.843363,
 							-25.709449
 						],
 						[
-							134.766965,
+							124.766965,
 							-25.692099
 						],
 						[
-							134.692851,
+							124.692851,
 							-25.668047
 						],
 						[
-							134.621744,
+							124.621744,
 							-25.63753
 						],
 						[
-							134.554337,
+							124.554337,
 							-25.600846
 						],
 						[
-							134.491287,
+							124.491287,
 							-25.558353
 						],
 						[
-							134.433203,
+							124.433203,
 							-25.510467
 						],
 						[
-							134.380647,
+							124.380647,
 							-25.457655
 						],
 						[
-							134.334122,
+							124.334122,
 							-25.400432
 						],
 						[
-							134.294073,
+							124.294073,
 							-25.339355
 						],
 						[
-							134.260879,
+							124.260879,
 							-25.275017
 						],
 						[
-							134.23485,
+							124.23485,
 							-25.208042
 						],
 						[
-							134.216226,
+							124.216226,
 							-25.13908
 						],
 						[
-							134.205175,
+							124.205175,
 							-25.068796
 						],
 						[
-							134.201791,
+							124.201791,
 							-24.99787
 						],
 						[
-							134.206092,
+							124.206092,
 							-24.926985
 						],
 						[
-							134.218024,
+							124.218024,
 							-24.856823
 						],
 						[
-							134.23746,
+							124.23746,
 							-24.788057
 						],
 						[
-							134.264202,
+							124.264202,
 							-24.721347
 						],
 						[
-							134.297981,
+							124.297981,
 							-24.657332
 						],
 						[
-							134.338464,
+							124.338464,
 							-24.596623
 						],
 						[
-							134.385256,
+							124.385256,
 							-24.539799
 						],
 						[
-							134.437903,
+							124.437903,
 							-24.487403
 						],
 						[
-							134.495896,
+							124.495896,
 							-24.439933
 						],
 						[
-							134.558679,
+							124.558679,
 							-24.397839
 						],
 						[
-							134.625652,
+							124.625652,
 							-24.361523
 						],
 						[
-							134.696174,
+							124.696174,
 							-24.331329
 						],
 						[
-							134.769577,
+							124.769577,
 							-24.307542
 						],
 						[
-							134.845162,
+							124.845162,
 							-24.290389
 						],
 						[
-							134.922213,
+							124.922213,
 							-24.280032
 						],
 						[
-							135,
+							125,
 							-24.276568
 						]
 					]
@@ -551,263 +551,263 @@
 				"coordinates": [
 					[
 						[
-							125,
+							135,
 							-24.276568
 						],
 						[
-							125.077787,
+							135.077787,
 							-24.280032
 						],
 						[
-							125.154838,
+							135.154838,
 							-24.290389
 						],
 						[
-							125.230423,
+							135.230423,
 							-24.307542
 						],
 						[
-							125.303826,
+							135.303826,
 							-24.331329
 						],
 						[
-							125.374348,
+							135.374348,
 							-24.361523
 						],
 						[
-							125.441321,
+							135.441321,
 							-24.397839
 						],
 						[
-							125.504104,
+							135.504104,
 							-24.439933
 						],
 						[
-							125.562097,
+							135.562097,
 							-24.487403
 						],
 						[
-							125.614744,
+							135.614744,
 							-24.539799
 						],
 						[
-							125.661536,
+							135.661536,
 							-24.596623
 						],
 						[
-							125.702019,
+							135.702019,
 							-24.657332
 						],
 						[
-							125.735798,
+							135.735798,
 							-24.721347
 						],
 						[
-							125.76254,
+							135.76254,
 							-24.788057
 						],
 						[
-							125.781976,
+							135.781976,
 							-24.856823
 						],
 						[
-							125.793908,
+							135.793908,
 							-24.926985
 						],
 						[
-							125.798209,
+							135.798209,
 							-24.99787
 						],
 						[
-							125.794825,
+							135.794825,
 							-25.068796
 						],
 						[
-							125.783774,
+							135.783774,
 							-25.13908
 						],
 						[
-							125.76515,
+							135.76515,
 							-25.208042
 						],
 						[
-							125.739121,
+							135.739121,
 							-25.275017
 						],
 						[
-							125.705927,
+							135.705927,
 							-25.339355
 						],
 						[
-							125.665878,
+							135.665878,
 							-25.400432
 						],
 						[
-							125.619353,
+							135.619353,
 							-25.457655
 						],
 						[
-							125.566797,
+							135.566797,
 							-25.510467
 						],
 						[
-							125.508713,
+							135.508713,
 							-25.558353
 						],
 						[
-							125.445663,
+							135.445663,
 							-25.600846
 						],
 						[
-							125.378256,
+							135.378256,
 							-25.63753
 						],
 						[
-							125.307149,
+							135.307149,
 							-25.668047
 						],
 						[
-							125.233035,
+							135.233035,
 							-25.692099
 						],
 						[
-							125.156637,
+							135.156637,
 							-25.709449
 						],
 						[
-							125.078704,
+							135.078704,
 							-25.719927
 						],
 						[
-							125,
+							135,
 							-25.723432
 						],
 						[
-							124.921296,
+							134.921296,
 							-25.719927
 						],
 						[
-							124.843363,
+							134.843363,
 							-25.709449
 						],
 						[
-							124.766965,
+							134.766965,
 							-25.692099
 						],
 						[
-							124.692851,
+							134.692851,
 							-25.668047
 						],
 						[
-							124.621744,
+							134.621744,
 							-25.63753
 						],
 						[
-							124.554337,
+							134.554337,
 							-25.600846
 						],
 						[
-							124.491287,
+							134.491287,
 							-25.558353
 						],
 						[
-							124.433203,
+							134.433203,
 							-25.510467
 						],
 						[
-							124.380647,
+							134.380647,
 							-25.457655
 						],
 						[
-							124.334122,
+							134.334122,
 							-25.400432
 						],
 						[
-							124.294073,
+							134.294073,
 							-25.339355
 						],
 						[
-							124.260879,
+							134.260879,
 							-25.275017
 						],
 						[
-							124.23485,
+							134.23485,
 							-25.208042
 						],
 						[
-							124.216226,
+							134.216226,
 							-25.13908
 						],
 						[
-							124.205175,
+							134.205175,
 							-25.068796
 						],
 						[
-							124.201791,
+							134.201791,
 							-24.99787
 						],
 						[
-							124.206092,
+							134.206092,
 							-24.926985
 						],
 						[
-							124.218024,
+							134.218024,
 							-24.856823
 						],
 						[
-							124.23746,
+							134.23746,
 							-24.788057
 						],
 						[
-							124.264202,
+							134.264202,
 							-24.721347
 						],
 						[
-							124.297981,
+							134.297981,
 							-24.657332
 						],
 						[
-							124.338464,
+							134.338464,
 							-24.596623
 						],
 						[
-							124.385256,
+							134.385256,
 							-24.539799
 						],
 						[
-							124.437903,
+							134.437903,
 							-24.487403
 						],
 						[
-							124.495896,
+							134.495896,
 							-24.439933
 						],
 						[
-							124.558679,
+							134.558679,
 							-24.397839
 						],
 						[
-							124.625652,
+							134.625652,
 							-24.361523
 						],
 						[
-							124.696174,
+							134.696174,
 							-24.331329
 						],
 						[
-							124.769577,
+							134.769577,
 							-24.307542
 						],
 						[
-							124.845162,
+							134.845162,
 							-24.290389
 						],
 						[
-							124.922213,
+							134.922213,
 							-24.280032
 						],
 						[
-							125,
+							135,
 							-24.276568
 						]
 					]
@@ -1092,7 +1092,7 @@
 				"type": "MultiPoint",
 				"coordinates": [
 					[
-						135,
+						125,
 						-25
 					],
 					[
@@ -1100,7 +1100,7 @@
 						-20
 					],
 					[
-						125,
+						135,
 						-25
 					]
 				]
diff --git a/packages/turf-buffer/test/out/geometry-collection-points.geojson b/packages/turf-buffer/test/out/geometry-collection-points.geojson
index f02e3c3576..dd1e0a1bb3 100644
--- a/packages/turf-buffer/test/out/geometry-collection-points.geojson
+++ b/packages/turf-buffer/test/out/geometry-collection-points.geojson
@@ -9,263 +9,263 @@
 				"coordinates": [
 					[
 						[
-							135,
+							125,
 							-24.276568
 						],
 						[
-							135.077787,
+							125.077787,
 							-24.280032
 						],
 						[
-							135.154838,
+							125.154838,
 							-24.290389
 						],
 						[
-							135.230423,
+							125.230423,
 							-24.307542
 						],
 						[
-							135.303826,
+							125.303826,
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diff --git a/packages/turf-buffer/test/out/linestring.geojson b/packages/turf-buffer/test/out/linestring.geojson
index 82b988bb82..7c5fde80e5 100644
--- a/packages/turf-buffer/test/out/linestring.geojson
+++ b/packages/turf-buffer/test/out/linestring.geojson
@@ -10,13 +10,89 @@
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@@ -27,8 +103,72 @@
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@@ -39,12 +179,88 @@
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@@ -55,12 +271,72 @@
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diff --git a/packages/turf-buffer/test/out/multi-linestring.geojson b/packages/turf-buffer/test/out/multi-linestring.geojson
index 49e913e4cb..19e601d11e 100644
--- a/packages/turf-buffer/test/out/multi-linestring.geojson
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diff --git a/packages/turf-buffer/test/out/multi-point.geojson b/packages/turf-buffer/test/out/multi-point.geojson
index 808faa638b..5d4b77c566 100644
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diff --git a/packages/turf-buffer/test/out/multi-polygon.geojson b/packages/turf-buffer/test/out/multi-polygon.geojson
index fe09674ae1..b617f5af93 100644
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diff --git a/packages/turf-buffer/test/out/north-latitude-points.geojson b/packages/turf-buffer/test/out/north-latitude-points.geojson
index 142621da04..c06b760002 100644
--- a/packages/turf-buffer/test/out/north-latitude-points.geojson
+++ b/packages/turf-buffer/test/out/north-latitude-points.geojson
@@ -7,22 +7,6 @@
 				"type": "Polygon",
 				"coordinates": [
 					[
-						[
-							-94.979553,
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-							75.460241
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-							75.449325
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 						[
 							-94.064941,
 							75.444364
@@ -306,6 +290,22 @@
 						[
 							-94.979553,
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+						],
+						[
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+							75.441356
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@@ -319,16 +319,16 @@
 				"type": "MultiPoint",
 				"coordinates": [
 					[
-						-94.97955322265625,
-						74.74046209428195
+						-94.06494140625,
+						74.7209322003536
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 					],
 					[
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-						74.7209322003536
+						-94.97955322265625,
+						74.74046209428195
 					]
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diff --git a/packages/turf-buffer/test/out/northern-polygon.geojson b/packages/turf-buffer/test/out/northern-polygon.geojson
index cc3d2fb10c..7f6b09cc39 100644
--- a/packages/turf-buffer/test/out/northern-polygon.geojson
+++ b/packages/turf-buffer/test/out/northern-polygon.geojson
@@ -17,80 +17,228 @@
 				"coordinates": [
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@@ -100,6 +248,26 @@
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@@ -109,16 +277,120 @@
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@@ -129,32 +401,248 @@
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@@ -165,20 +653,384 @@
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@@ -204,28 +1056,28 @@
 							74.69068515369659
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-							-94.82437133789062,
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 						[
-							-94.91363525390625,
-							74.69032255967197
+							-94.89852905273438,
+							74.73648576006866
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 						[
-							-94.86488342285156,
-							74.68959734647507
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diff --git a/packages/turf-buffer/test/out/polygon-with-holes.geojson b/packages/turf-buffer/test/out/polygon-with-holes.geojson
index f8fd7cf1ce..c987ded91d 100644
--- a/packages/turf-buffer/test/out/polygon-with-holes.geojson
+++ b/packages/turf-buffer/test/out/polygon-with-holes.geojson
@@ -8,6 +8,14 @@
 				"type": "Polygon",
 				"coordinates": [
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@@ -17,28 +25,232 @@
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@@ -48,6 +260,10 @@
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@@ -57,8 +273,72 @@
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@@ -69,12 +349,88 @@
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@@ -85,24 +441,184 @@
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@@ -113,20 +629,152 @@
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+						[
+							138.725595,
+							-32.340172
+						],
+						[
+							138.706621,
+							-32.350828
+						],
+						[
+							138.688103,
+							-32.362256
+						],
+						[
+							138.674694,
+							-32.36876
+						],
+						[
+							138.6617,
+							-32.376058
 						],
 						[
-							138.703259,
-							-32.353694
+							138.641746,
+							-32.38474
 						],
 						[
-							138.578137,
-							-32.411226
+							138.622166,
+							-32.394236
 						],
 						[
-							138.44438,
-							-32.444006
+							138.608168,
+							-32.399349
+						],
+						[
+							138.594503,
+							-32.405295
+						],
+						[
+							138.573773,
+							-32.411914
+						],
+						[
+							138.553333,
+							-32.419381
+						],
+						[
+							138.538889,
+							-32.423052
+						],
+						[
+							138.524692,
+							-32.427584
+						],
+						[
+							138.503399,
+							-32.432072
+						],
+						[
+							138.482309,
+							-32.437433
+						],
+						[
+							138.467568,
+							-32.439624
+						],
+						[
+							138.452985,
+							-32.442697
+						],
+						[
+							138.431347,
+							-32.445007
+						],
+						[
+							138.409823,
+							-32.448206
+						],
+						[
+							138.394935,
+							-32.448895
+						],
+						[
+							138.380117,
+							-32.450477
+						],
+						[
+							138.358356,
+							-32.450587
+						],
+						[
+							138.336618,
+							-32.451592
+						],
+						[
+							138.321738,
+							-32.450771
 						],
 						[
 							138.306835,
@@ -137,20 +785,152 @@
 							-32.001229
 						],
 						[
-							128.326924,
-							-31.981925
+							128.448731,
+							-31.999842
+						],
+						[
+							128.434319,
+							-31.99934
+						],
+						[
+							128.412282,
+							-31.996321
+						],
+						[
+							128.390142,
+							-31.994182
+						],
+						[
+							128.376003,
+							-31.99135
+						],
+						[
+							128.361715,
+							-31.989393
+						],
+						[
+							128.340097,
+							-31.984159
+						],
+						[
+							128.318287,
+							-31.979791
+						],
+						[
+							128.304506,
+							-31.975544
+						],
+						[
+							128.29049,
+							-31.972151
+						],
+						[
+							128.269512,
+							-31.964757
+						],
+						[
+							128.248256,
+							-31.958205
+						],
+						[
+							128.234975,
+							-31.952585
+						],
+						[
+							128.221375,
+							-31.947792
 						],
 						[
-							128.196876,
-							-31.937203
+							128.201252,
+							-31.938313
 						],
 						[
-							128.077641,
-							-31.868679
+							128.180768,
+							-31.929645
 						],
 						[
-							127.973528,
-							-31.778829
+							128.168124,
+							-31.92271
+						],
+						[
+							128.155078,
+							-31.916565
+						],
+						[
+							128.136018,
+							-31.9051
+						],
+						[
+							128.116516,
+							-31.894403
+						],
+						[
+							128.104638,
+							-31.886225
+						],
+						[
+							128.092281,
+							-31.878792
+						],
+						[
+							128.074478,
+							-31.865457
+						],
+						[
+							128.056158,
+							-31.852842
+						],
+						[
+							128.045169,
+							-31.843504
+						],
+						[
+							128.033628,
+							-31.834859
+						],
+						[
+							128.017265,
+							-31.819792
+						],
+						[
+							128.000315,
+							-31.805388
+						],
+						[
+							127.990328,
+							-31.794986
+						],
+						[
+							127.97972,
+							-31.785218
+						],
+						[
+							127.964965,
+							-31.768572
+						],
+						[
+							127.94956,
+							-31.752528
+						],
+						[
+							127.940676,
+							-31.741169
+						],
+						[
+							127.93111,
+							-31.730377
+						],
+						[
+							127.918116,
+							-31.712325
+						],
+						[
+							127.904412,
+							-31.694804
+						],
+						[
+							127.896723,
+							-31.682605
 						],
 						[
 							127.888298,
@@ -161,19 +941,107 @@
 							-24.999419
 						],
 						[
-							123.512458,
-							-24.862081
+							123.576077,
+							-24.98973
 						],
 						[
-							123.473851,
-							-24.713219
+							123.569828,
+							-24.980457
 						],
 						[
-							123.467583,
-							-24.559561
+							123.5578,
+							-24.957996
+						],
+						[
+							123.545083,
+							-24.935916
+						],
+						[
+							123.540511,
+							-24.925712
+						],
+						[
+							123.535232,
+							-24.915855
+						],
+						[
+							123.525538,
+							-24.892292
+						],
+						[
+							123.51512,
+							-24.869039
+						],
+						[
+							123.511604,
+							-24.858425
+						],
+						[
+							123.50735,
+							-24.848085
+						],
+						[
+							123.500089,
+							-24.823661
+						],
+						[
+							123.492077,
+							-24.799474
+						],
+						[
+							123.489653,
+							-24.788559
+						],
+						[
+							123.486466,
+							-24.777841
+						],
+						[
+							123.481713,
+							-24.752808
+						],
+						[
+							123.476189,
+							-24.727935
+						],
+						[
+							123.474882,
+							-24.71683
+						],
+						[
+							123.472796,
+							-24.705845
+						],
+						[
+							123.4706,
+							-24.68046
+						],
+						[
+							123.467621,
+							-24.655155
+						],
+						[
+							123.467444,
+							-24.643975
+						],
+						[
+							123.46648,
+							-24.632835
+						],
+						[
+							123.466864,
+							-24.607358
+						],
+						[
+							123.46646,
+							-24.581882
 						]
 					],
 					[
+						[
+							128.682132,
+							-18.116011
+						],
 						[
 							130.38156,
 							-26.296552
@@ -189,10 +1057,6 @@
 						[
 							128.682132,
 							-18.116011
-						],
-						[
-							130.38156,
-							-26.296552
 						]
 					]
 				]
@@ -210,32 +1074,32 @@
 							-24.607069137709694
 						],
 						[
-							128.49609375,
-							-31.278550858946517
+							124.892578125,
+							-13.923403897723334
 						],
 						[
-							138.33984375,
-							-31.728167146023935
+							130.4296875,
+							-13.581920900545844
 						],
 						[
-							144.84375,
-							-23.40276490540795
+							135.703125,
+							-13.667338259654947
 						],
 						[
 							141.416015625,
 							-16.804541076383455
 						],
 						[
-							135.703125,
-							-13.667338259654947
+							144.84375,
+							-23.40276490540795
 						],
 						[
-							130.4296875,
-							-13.581920900545844
+							138.33984375,
+							-31.728167146023935
 						],
 						[
-							124.892578125,
-							-13.923403897723334
+							128.49609375,
+							-31.278550858946517
 						],
 						[
 							124.18945312500001,

From 6d8f90537df47e725167c8bbde0586120a212966 Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Sun, 16 Apr 2017 16:08:02 -0400
Subject: [PATCH 2/4] Only limit offset for polygons

---
 packages/turf-buffer/bench.js                 |   20 +-
 packages/turf-buffer/index.js                 |   10 +-
 .../out/feature-collection-points.geojson     |  264 +-
 .../out/geometry-collection-points.geojson    |  260 +-
 .../turf-buffer/test/out/linestring.geojson   | 1272 ++++--
 .../test/out/multi-linestring.geojson         | 3702 ++++++++++++-----
 .../turf-buffer/test/out/multi-point.geojson  |  638 +--
 .../test/out/north-latitude-points.geojson    |   40 +-
 8 files changed, 4323 insertions(+), 1883 deletions(-)

diff --git a/packages/turf-buffer/bench.js b/packages/turf-buffer/bench.js
index 3acbc6cf2e..0c4ab3a529 100644
--- a/packages/turf-buffer/bench.js
+++ b/packages/turf-buffer/bench.js
@@ -17,16 +17,16 @@ const fixtures = fs.readdirSync(directory).map(filename => {
  * Benchmark Results
  *
  * ==polygon-offset:after==
- * feature-collection-points x 6,905 ops/sec ±16.80% (70 runs sampled)
- * geometry-collection-points x 7,682 ops/sec ±9.08% (75 runs sampled)
- * linestring x 404 ops/sec ±1.54% (85 runs sampled)
- * multi-linestring x 117 ops/sec ±1.43% (73 runs sampled)
- * multi-point x 1,406 ops/sec ±17.23% (81 runs sampled)
- * multi-polygon x 38.88 ops/sec ±1.21% (51 runs sampled)
- * north-latitude-points x 552 ops/sec ±1.24% (84 runs sampled)
- * northern-polygon x 215 ops/sec ±2.45% (81 runs sampled)
- * point x 36,843 ops/sec ±6.75% (80 runs sampled)
- * polygon-with-holes x 74.91 ops/sec ±7.91% (63 runs sampled)
+ * feature-collection-points x 9,876 ops/sec ±0.88% (89 runs sampled)
+ * geometry-collection-points x 9,919 ops/sec ±0.90% (91 runs sampled)
+ * linestring x 219 ops/sec ±1.37% (83 runs sampled)
+ * multi-linestring x 61.91 ops/sec ±4.88% (64 runs sampled)
+ * multi-point x 995 ops/sec ±24.51% (82 runs sampled)
+ * multi-polygon x 42.77 ops/sec ±0.92% (56 runs sampled)
+ * north-latitude-points x 842 ops/sec ±1.23% (91 runs sampled)
+ * northern-polygon x 236 ops/sec ±1.83% (83 runs sampled)
+ * point x 43,814 ops/sec ±1.19% (94 runs sampled)
+ * polygon-with-holes x 79.33 ops/sec ±16.13% (65 runs sampled)
  *
  * ==jsts:before ==
  * feature-collection-points x 9,335 ops/sec ±1.37% (88 runs sampled)
diff --git a/packages/turf-buffer/index.js b/packages/turf-buffer/index.js
index 8af45140f0..9c7765279e 100644
--- a/packages/turf-buffer/index.js
+++ b/packages/turf-buffer/index.js
@@ -80,9 +80,6 @@ function buffer(feature, radius, units, steps) {
     var geometry = (feature.type === 'Feature') ? feature.geometry : feature;
     var coords = getCoords(feature);
 
-    // Polygon-offset has issues when arcSegments is greater than 32
-    var offset = new Offset(coords, (steps > 32) ? 32 : steps);
-
     switch (geometry.type) {
     case 'Point':
         var pointBuffer = circle(feature, radius, steps, units);
@@ -98,11 +95,14 @@ function buffer(feature, radius, units, steps) {
         return dissolve(featureCollection(polys));
     case 'LineString':
     case 'MultiLineString':
-        var lineBuffer = offset.offsetLine(distance);
+        var lineOffset = new Offset(coords, steps);
+        var lineBuffer = lineOffset.offsetLine(distance);
         return polygon(lineBuffer, properties);
     case 'Polygon':
     case 'MultiPolygon':
-        var polyBuffer = offset.margin(distance);
+        // Polygon-offset has issues when arcSegments is greater than 32
+        var polyOffset = new Offset(coords, (steps > 32) ? 32 : steps);
+        var polyBuffer = polyOffset.margin(distance);
         return polygon(polyBuffer, properties);
     default:
         throw new Error('geometry type ' + geometry.type + ' not supported');
diff --git a/packages/turf-buffer/test/out/feature-collection-points.geojson b/packages/turf-buffer/test/out/feature-collection-points.geojson
index fb4da8bb8e..2aab3decf1 100644
--- a/packages/turf-buffer/test/out/feature-collection-points.geojson
+++ b/packages/turf-buffer/test/out/feature-collection-points.geojson
@@ -9,263 +9,263 @@
 				"coordinates": [
 					[
 						[
-							125,
+							135,
 							-24.276568
 						],
 						[
-							125.077787,
+							135.077787,
 							-24.280032
 						],
 						[
-							125.154838,
+							135.154838,
 							-24.290389
 						],
 						[
-							125.230423,
+							135.230423,
 							-24.307542
 						],
 						[
-							125.303826,
+							135.303826,
 							-24.331329
 						],
 						[
-							125.374348,
+							135.374348,
 							-24.361523
 						],
 						[
-							125.441321,
+							135.441321,
 							-24.397839
 						],
 						[
-							125.504104,
+							135.504104,
 							-24.439933
 						],
 						[
-							125.562097,
+							135.562097,
 							-24.487403
 						],
 						[
-							125.614744,
+							135.614744,
 							-24.539799
 						],
 						[
-							125.661536,
+							135.661536,
 							-24.596623
 						],
 						[
-							125.702019,
+							135.702019,
 							-24.657332
 						],
 						[
-							125.735798,
+							135.735798,
 							-24.721347
 						],
 						[
-							125.76254,
+							135.76254,
 							-24.788057
 						],
 						[
-							125.781976,
+							135.781976,
 							-24.856823
 						],
 						[
-							125.793908,
+							135.793908,
 							-24.926985
 						],
 						[
-							125.798209,
+							135.798209,
 							-24.99787
 						],
 						[
-							125.794825,
+							135.794825,
 							-25.068796
 						],
 						[
-							125.783774,
+							135.783774,
 							-25.13908
 						],
 						[
-							125.76515,
+							135.76515,
 							-25.208042
 						],
 						[
-							125.739121,
+							135.739121,
 							-25.275017
 						],
 						[
-							125.705927,
+							135.705927,
 							-25.339355
 						],
 						[
-							125.665878,
+							135.665878,
 							-25.400432
 						],
 						[
-							125.619353,
+							135.619353,
 							-25.457655
 						],
 						[
-							125.566797,
+							135.566797,
 							-25.510467
 						],
 						[
-							125.508713,
+							135.508713,
 							-25.558353
 						],
 						[
-							125.445663,
+							135.445663,
 							-25.600846
 						],
 						[
-							125.378256,
+							135.378256,
 							-25.63753
 						],
 						[
-							125.307149,
+							135.307149,
 							-25.668047
 						],
 						[
-							125.233035,
+							135.233035,
 							-25.692099
 						],
 						[
-							125.156637,
+							135.156637,
 							-25.709449
 						],
 						[
-							125.078704,
+							135.078704,
 							-25.719927
 						],
 						[
-							125,
+							135,
 							-25.723432
 						],
 						[
-							124.921296,
+							134.921296,
 							-25.719927
 						],
 						[
-							124.843363,
+							134.843363,
 							-25.709449
 						],
 						[
-							124.766965,
+							134.766965,
 							-25.692099
 						],
 						[
-							124.692851,
+							134.692851,
 							-25.668047
 						],
 						[
-							124.621744,
+							134.621744,
 							-25.63753
 						],
 						[
-							124.554337,
+							134.554337,
 							-25.600846
 						],
 						[
-							124.491287,
+							134.491287,
 							-25.558353
 						],
 						[
-							124.433203,
+							134.433203,
 							-25.510467
 						],
 						[
-							124.380647,
+							134.380647,
 							-25.457655
 						],
 						[
-							124.334122,
+							134.334122,
 							-25.400432
 						],
 						[
-							124.294073,
+							134.294073,
 							-25.339355
 						],
 						[
-							124.260879,
+							134.260879,
 							-25.275017
 						],
 						[
-							124.23485,
+							134.23485,
 							-25.208042
 						],
 						[
-							124.216226,
+							134.216226,
 							-25.13908
 						],
 						[
-							124.205175,
+							134.205175,
 							-25.068796
 						],
 						[
-							124.201791,
+							134.201791,
 							-24.99787
 						],
 						[
-							124.206092,
+							134.206092,
 							-24.926985
 						],
 						[
-							124.218024,
+							134.218024,
 							-24.856823
 						],
 						[
-							124.23746,
+							134.23746,
 							-24.788057
 						],
 						[
-							124.264202,
+							134.264202,
 							-24.721347
 						],
 						[
-							124.297981,
+							134.297981,
 							-24.657332
 						],
 						[
-							124.338464,
+							134.338464,
 							-24.596623
 						],
 						[
-							124.385256,
+							134.385256,
 							-24.539799
 						],
 						[
-							124.437903,
+							134.437903,
 							-24.487403
 						],
 						[
-							124.495896,
+							134.495896,
 							-24.439933
 						],
 						[
-							124.558679,
+							134.558679,
 							-24.397839
 						],
 						[
-							124.625652,
+							134.625652,
 							-24.361523
 						],
 						[
-							124.696174,
+							134.696174,
 							-24.331329
 						],
 						[
-							124.769577,
+							134.769577,
 							-24.307542
 						],
 						[
-							124.845162,
+							134.845162,
 							-24.290389
 						],
 						[
-							124.922213,
+							134.922213,
 							-24.280032
 						],
 						[
-							125,
+							135,
 							-24.276568
 						]
 					]
@@ -551,263 +551,263 @@
 				"coordinates": [
 					[
 						[
-							135,
+							125,
 							-24.276568
 						],
 						[
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diff --git a/packages/turf-buffer/test/out/geometry-collection-points.geojson b/packages/turf-buffer/test/out/geometry-collection-points.geojson
index dd1e0a1bb3..f02e3c3576 100644
--- a/packages/turf-buffer/test/out/geometry-collection-points.geojson
+++ b/packages/turf-buffer/test/out/geometry-collection-points.geojson
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diff --git a/packages/turf-buffer/test/out/linestring.geojson b/packages/turf-buffer/test/out/linestring.geojson
index 7c5fde80e5..322e2822f7 100644
--- a/packages/turf-buffer/test/out/linestring.geojson
+++ b/packages/turf-buffer/test/out/linestring.geojson
@@ -11,28 +11,56 @@
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@@ -439,124 +883,252 @@
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@@ -587,104 +1159,204 @@
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diff --git a/packages/turf-buffer/test/out/multi-linestring.geojson b/packages/turf-buffer/test/out/multi-linestring.geojson
index 19e601d11e..591775f76a 100644
--- a/packages/turf-buffer/test/out/multi-linestring.geojson
+++ b/packages/turf-buffer/test/out/multi-linestring.geojson
@@ -9,44 +9,84 @@
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diff --git a/packages/turf-buffer/test/out/multi-point.geojson b/packages/turf-buffer/test/out/multi-point.geojson
index 5d4b77c566..808faa638b 100644
--- a/packages/turf-buffer/test/out/multi-point.geojson
+++ b/packages/turf-buffer/test/out/multi-point.geojson
@@ -3,700 +3,700 @@
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diff --git a/packages/turf-buffer/test/out/north-latitude-points.geojson b/packages/turf-buffer/test/out/north-latitude-points.geojson
index c06b760002..142621da04 100644
--- a/packages/turf-buffer/test/out/north-latitude-points.geojson
+++ b/packages/turf-buffer/test/out/north-latitude-points.geojson
@@ -7,6 +7,22 @@
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 					],
 					[
-						-94.97955322265625,
-						74.74046209428195
+						-94.06494140625,
+						74.7209322003536
 					]
 				]
 			}

From 974fb558f74c00a423a97c0d0f8437e9c3096040 Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Sat, 6 May 2017 14:01:26 -0400
Subject: [PATCH 3/4] Test fails - input mutation

---
 packages/turf-buffer/index.js | 30 ++++++++++++++---------------
 packages/turf-buffer/test.js  | 36 +++++++++++++++++++++++++++++++----
 2 files changed, 47 insertions(+), 19 deletions(-)

diff --git a/packages/turf-buffer/index.js b/packages/turf-buffer/index.js
index 9c7765279e..5599415151 100644
--- a/packages/turf-buffer/index.js
+++ b/packages/turf-buffer/index.js
@@ -1,21 +1,21 @@
+var meta = require('@turf/meta');
 var Offset = require('polygon-offset');
-var helpers = require('@turf/helpers');
 var circle = require('@turf/circle');
+var helpers = require('@turf/helpers');
 var dissolve = require('@turf/dissolve');
-var meta = require('@turf/meta');
 var getCoords = require('@turf/invariant').getCoords;
+var point = helpers.point;
+var polygon = helpers.polygon;
 var coordEach = meta.coordEach;
 var featureEach = meta.featureEach;
 var featureCollection = helpers.featureCollection;
 var distanceToDegrees = helpers.distanceToDegrees;
-var polygon = helpers.polygon;
-var point = helpers.point;
 
 /**
  * Calculates a buffer for input features for a given radius. Units supported are miles, kilometers, and degrees.
  *
  * @name buffer
- * @param {FeatureCollection|Feature<any>} feature input to be buffered
+ * @param {FeatureCollection|Geometry|Feature<any>} feature input to be buffered
  * @param {number} radius distance to draw the buffer
  * @param {string} [units=kilometers] any of the options supported by turf units
  * @param {number} [steps=64] number of steps
@@ -64,30 +64,32 @@ module.exports = function (geojson, radius, units, steps) {
  * Buffer single Feature
  *
  * @private
- * @param {Feature<any>} feature input to be buffered
+ * @param {Geometry|Feature<any>} geojson input to be buffered
  * @param {number} radius distance to draw the buffer
  * @param {string} [units='kilometers'] any of the options supported by turf units
  * @param {number} [steps=64] number of steps
  * @returns {Feature<Polygon|MultiPolygon>} buffered feature
  */
-function buffer(feature, radius, units, steps) {
+function buffer(geojson, radius, units, steps) {
     // validation
+    if (!geojson) throw new Error('geojson is required');
+    if (radius === undefined || radius === null) throw new Error('radius is required');
     if (steps <= 0) throw new Error('steps must be greater than 0');
 
     // default params
-    var properties = feature.properties || {};
+    var properties = geojson.properties || {};
     var distance = distanceToDegrees(radius, units);
-    var geometry = (feature.type === 'Feature') ? feature.geometry : feature;
-    var coords = getCoords(feature);
+    var coords = getCoords(geojson);
+    var type = (geojson.geometry) ? geojson.geometry.type : geojson.type;
 
-    switch (geometry.type) {
+    switch (type) {
     case 'Point':
-        var pointBuffer = circle(feature, radius, steps, units);
+        var pointBuffer = circle(coords, radius, steps, units);
         pointBuffer.properties = properties;
         return pointBuffer;
     case 'MultiPoint':
         var polys = [];
-        coordEach(feature, function (coord) {
+        coordEach(geojson, function (coord) {
             var poly = circle(point(coord, properties), radius, steps, units);
             poly.properties = properties;
             polys.push(poly);
@@ -104,7 +106,5 @@ function buffer(feature, radius, units, steps) {
         var polyOffset = new Offset(coords, (steps > 32) ? 32 : steps);
         var polyBuffer = polyOffset.margin(distance);
         return polygon(polyBuffer, properties);
-    default:
-        throw new Error('geometry type ' + geometry.type + ' not supported');
     }
 }
diff --git a/packages/turf-buffer/test.js b/packages/turf-buffer/test.js
index 2fd65dc567..0255acf290 100644
--- a/packages/turf-buffer/test.js
+++ b/packages/turf-buffer/test.js
@@ -1,11 +1,11 @@
-const test = require('tape');
 const fs = require('fs');
+const test = require('tape');
 const path = require('path');
 const load = require('load-json-file');
 const write = require('write-json-file');
 const truncate = require('@turf/truncate');
-const featureEach = require('@turf/meta').featureEach;
-const featureCollection = require('@turf/helpers').featureCollection;
+const {featureEach} = require('@turf/meta');
+const {featureCollection, point, polygon} = require('@turf/helpers');
 const buffer = require('./');
 
 const directories = {
@@ -21,7 +21,7 @@ const fixtures = fs.readdirSync(directories.in).map(filename => {
     };
 });
 
-test('turf-buffer', function (t) {
+test('turf-buffer', t => {
     for (const {filename, name, geojson} of fixtures) {
         let {radius, units, padding} = geojson.properties || {};
         radius = radius || 50;
@@ -39,3 +39,31 @@ test('turf-buffer', function (t) {
     }
     t.end();
 });
+
+test('turf-buffer - Support Geometry Objects', t => {
+    const pt = point([61, 5]);
+    const poly = polygon([[[11, 0], [22, 4], [31, 0], [31, 11], [21, 15], [11, 11], [11, 0]]]);
+
+    t.assert(buffer(pt.geometry, 10));
+    t.assert(buffer(poly.geometry, 10));
+    t.end();
+});
+
+test('turf-buffer - Prevent Input Mutation', t => {
+    const pt = point([61, 5]);
+    const poly = polygon([[[11, 0], [22, 4], [31, 0], [31, 11], [21, 15], [11, 11], [11, 0]]]);
+    const collection = featureCollection([pt, poly]);
+
+    const beforePt = JSON.parse(JSON.stringify(pt));
+    const beforePoly = JSON.parse(JSON.stringify(poly));
+    const beforeCollection = JSON.parse(JSON.stringify(collection));
+
+    buffer(pt, 10);
+    buffer(poly, 10);
+    buffer(collection, 10);
+
+    t.deepEqual(pt, beforePt, 'pt should not mutate');
+    t.deepEqual(poly, beforePoly, 'poly should not mutate');
+    t.deepEqual(collection, beforeCollection, 'collection should not mutate');
+    t.end();
+});

From f79eedd32be96c38ada33166180fee645756424a Mon Sep 17 00:00:00 2001
From: Denis <carriere.denis@gmail.com>
Date: Sat, 6 May 2017 14:24:29 -0400
Subject: [PATCH 4/4] prevent input mutation

---
 packages/turf-buffer/index.js                 |  4 ++
 packages/turf-buffer/test.js                  |  3 +-
 .../test/out/multi-linestring.geojson         | 40 ++++++-------
 .../test/out/multi-polygon.geojson            | 56 +++++++++----------
 .../test/out/northern-polygon.geojson         | 24 ++++----
 .../test/out/polygon-with-holes.geojson       | 24 ++++----
 6 files changed, 78 insertions(+), 73 deletions(-)

diff --git a/packages/turf-buffer/index.js b/packages/turf-buffer/index.js
index 5599415151..c845424053 100644
--- a/packages/turf-buffer/index.js
+++ b/packages/turf-buffer/index.js
@@ -39,6 +39,7 @@ var distanceToDegrees = helpers.distanceToDegrees;
 
 module.exports = function (geojson, radius, units, steps) {
     // validation
+    if (!geojson) throw new Error('geojson is required');
     if (radius === undefined || radius === null) throw new Error('radius is required');
 
     // default params
@@ -76,6 +77,9 @@ function buffer(geojson, radius, units, steps) {
     if (radius === undefined || radius === null) throw new Error('radius is required');
     if (steps <= 0) throw new Error('steps must be greater than 0');
 
+    // prevent input mutation
+    geojson = JSON.parse(JSON.stringify(geojson));
+
     // default params
     var properties = geojson.properties || {};
     var distance = distanceToDegrees(radius, units);
diff --git a/packages/turf-buffer/test.js b/packages/turf-buffer/test.js
index 0255acf290..05dcea4e20 100644
--- a/packages/turf-buffer/test.js
+++ b/packages/turf-buffer/test.js
@@ -13,13 +13,14 @@ const directories = {
     out: path.join(__dirname, 'test', 'out') + path.sep
 };
 
-const fixtures = fs.readdirSync(directories.in).map(filename => {
+let fixtures = fs.readdirSync(directories.in).map(filename => {
     return {
         filename,
         name: path.parse(filename).name,
         geojson: load.sync(directories.in + filename)
     };
 });
+// fixtures = fixtures.filter(({name}) => name === 'northern-polygon');
 
 test('turf-buffer', t => {
     for (const {filename, name, geojson} of fixtures) {
diff --git a/packages/turf-buffer/test/out/multi-linestring.geojson b/packages/turf-buffer/test/out/multi-linestring.geojson
index 591775f76a..05fbda9521 100644
--- a/packages/turf-buffer/test/out/multi-linestring.geojson
+++ b/packages/turf-buffer/test/out/multi-linestring.geojson
@@ -3782,46 +3782,46 @@
 					],
 					[
 						[
-							133.59375,
-							-28.38173504322308
-						],
-						[
-							138.427734375,
-							-23.68477416688374
+							122.51953124999999,
+							-22.024545601240337
 						],
 						[
-							137.4169921875,
-							-19.84939395842278
+							128.9794921875,
+							-19.062117883514652
 						],
 						[
 							134.5166015625,
 							-17.936928637549432
 						],
 						[
-							128.9794921875,
-							-19.062117883514652
+							137.4169921875,
+							-19.84939395842278
 						],
 						[
-							122.51953124999999,
-							-22.024545601240337
+							138.427734375,
+							-23.68477416688374
+						],
+						[
+							133.59375,
+							-28.38173504322308
 						]
 					],
 					[
 						[
-							139.7900390625,
-							-31.316101383495635
-						],
-						[
-							142.11914062499997,
-							-29.458731185355315
+							144.3603515625,
+							-22.55314747840318
 						],
 						[
 							144.580078125,
 							-25.403584973186703
 						],
 						[
-							144.3603515625,
-							-22.55314747840318
+							142.11914062499997,
+							-29.458731185355315
+						],
+						[
+							139.7900390625,
+							-31.316101383495635
 						]
 					]
 				]
diff --git a/packages/turf-buffer/test/out/multi-polygon.geojson b/packages/turf-buffer/test/out/multi-polygon.geojson
index b617f5af93..f94113c03c 100644
--- a/packages/turf-buffer/test/out/multi-polygon.geojson
+++ b/packages/turf-buffer/test/out/multi-polygon.geojson
@@ -2901,16 +2901,16 @@
 								-31.466153715024284
 							],
 							[
-								121.9921875,
-								-18.729501999072138
+								134.4287109375,
+								-31.466153715024284
 							],
 							[
 								134.4287109375,
 								-18.729501999072138
 							],
 							[
-								134.4287109375,
-								-31.466153715024284
+								121.9921875,
+								-18.729501999072138
 							],
 							[
 								121.9921875,
@@ -2925,44 +2925,44 @@
 								-15.961329081596647
 							],
 							[
-								131.2646484375,
-								-13.88074584202559
-							],
-							[
-								136.7138671875,
-								-12.46876014482322
+								126.826171875,
+								-18.22935133838667
 							],
 							[
-								143.173828125,
-								-16.84660510639629
+								132.451171875,
+								-18.062312304546715
 							],
 							[
-								142.998046875,
-								-33.100745405144245
+								135.703125,
+								-14.519780046326085
 							],
 							[
-								134.7802734375,
-								-32.10118973232094
+								139.6142578125,
+								-18.60460138845525
 							],
 							[
 								134.9560546875,
 								-24.607069137709694
 							],
 							[
-								139.6142578125,
-								-18.60460138845525
+								134.7802734375,
+								-32.10118973232094
 							],
 							[
-								135.703125,
-								-14.519780046326085
+								142.998046875,
+								-33.100745405144245
 							],
 							[
-								132.451171875,
-								-18.062312304546715
+								143.173828125,
+								-16.84660510639629
 							],
 							[
-								126.826171875,
-								-18.22935133838667
+								136.7138671875,
+								-12.46876014482322
+							],
+							[
+								131.2646484375,
+								-13.88074584202559
 							],
 							[
 								125.3759765625,
@@ -2977,16 +2977,16 @@
 								-36.27970720524016
 							],
 							[
-								129.111328125,
-								-34.234512362369856
+								131.8798828125,
+								-36.27970720524016
 							],
 							[
 								131.8798828125,
 								-34.234512362369856
 							],
 							[
-								131.8798828125,
-								-36.27970720524016
+								129.111328125,
+								-34.234512362369856
 							],
 							[
 								129.111328125,
diff --git a/packages/turf-buffer/test/out/northern-polygon.geojson b/packages/turf-buffer/test/out/northern-polygon.geojson
index 7f6b09cc39..361957d491 100644
--- a/packages/turf-buffer/test/out/northern-polygon.geojson
+++ b/packages/turf-buffer/test/out/northern-polygon.geojson
@@ -1056,28 +1056,28 @@
 							74.69068515369659
 						],
 						[
-							-94.86488342285156,
-							74.68959734647507
-						],
-						[
-							-94.91363525390625,
-							74.69032255967197
+							-94.79827880859375,
+							74.71133916265154
 						],
 						[
-							-94.976806640625,
-							74.72400796764163
+							-94.82437133789062,
+							74.73630499357218
 						],
 						[
 							-94.89852905273438,
 							74.73648576006866
 						],
 						[
-							-94.82437133789062,
-							74.73630499357218
+							-94.976806640625,
+							74.72400796764163
 						],
 						[
-							-94.79827880859375,
-							74.71133916265154
+							-94.91363525390625,
+							74.69032255967197
+						],
+						[
+							-94.86488342285156,
+							74.68959734647507
 						],
 						[
 							-94.81887817382812,
diff --git a/packages/turf-buffer/test/out/polygon-with-holes.geojson b/packages/turf-buffer/test/out/polygon-with-holes.geojson
index c987ded91d..740e8007b0 100644
--- a/packages/turf-buffer/test/out/polygon-with-holes.geojson
+++ b/packages/turf-buffer/test/out/polygon-with-holes.geojson
@@ -1074,32 +1074,32 @@
 							-24.607069137709694
 						],
 						[
-							124.892578125,
-							-13.923403897723334
+							128.49609375,
+							-31.278550858946517
 						],
 						[
-							130.4296875,
-							-13.581920900545844
+							138.33984375,
+							-31.728167146023935
 						],
 						[
-							135.703125,
-							-13.667338259654947
+							144.84375,
+							-23.40276490540795
 						],
 						[
 							141.416015625,
 							-16.804541076383455
 						],
 						[
-							144.84375,
-							-23.40276490540795
+							135.703125,
+							-13.667338259654947
 						],
 						[
-							138.33984375,
-							-31.728167146023935
+							130.4296875,
+							-13.581920900545844
 						],
 						[
-							128.49609375,
-							-31.278550858946517
+							124.892578125,
+							-13.923403897723334
 						],
 						[
 							124.18945312500001,