diff --git a/build/generate-struct-arrays.js b/build/generate-struct-arrays.js
index 77b6dee2fd8..a0ad45b0f8c 100644
--- a/build/generate-struct-arrays.js
+++ b/build/generate-struct-arrays.js
@@ -76,13 +76,13 @@ function createStructArrayType(name: string, layout: StructArrayLayout, includeS
     }
 }
 
-function createStructArrayLayoutType({members, size}) {
+function createStructArrayLayoutType({members, size, alignment}) {
     const usedTypes = new Set(['Uint8']);
     members = normalizeMembers(members, usedTypes);
 
     // combine consecutive 'members' with same underlying type, summing their
     // component counts
-    members = members.reduce((memo, member) => {
+    if (!alignment || alignment === 1) members = members.reduce((memo, member) => {
         if (memo.length > 0 && memo[memo.length - 1].type === member.type) {
             const last = memo[memo.length - 1];
             return memo.slice(0, -1).concat(util.extend({}, last, {
@@ -154,7 +154,7 @@ createStructArrayType('feature_index', createLayout([
     { type: 'Uint16', name: 'sourceLayerIndex' },
     // the bucket the feature appears in
     { type: 'Uint16', name: 'bucketIndex' }
-], 4), true);
+]), true);
 
 // triangle index array
 createStructArrayType('triangle_index', createLayout([
@@ -192,7 +192,7 @@ createStructArrayLayoutType(createLayout([{
 const layouts = Object.keys(layoutCache).map(k => layoutCache[k]);
 
 fs.writeFileSync('src/data/array_types.js',
-    `// This file is generated. Edit build/generate-struct-arrays.js, then run \`node build/generate-struct-arrays.js\`.
+    `// This file is generated. Edit build/generate-struct-arrays.js, then run \`yarn run codegen\`.
 // @flow
 
 const assert = require('assert');
diff --git a/package.json b/package.json
index ad7b2517e11..4ffee255987 100644
--- a/package.json
+++ b/package.json
@@ -154,7 +154,8 @@
     "test-flow": "node build/generate-flow-typed-style-spec && flow .",
     "test-flow-cov": "flow-coverage-report -i 'src/**/*.js' -t html",
     "test-cov": "nyc --require=flow-remove-types/register --reporter=text-summary --reporter=lcov --cache run-s test-unit test-expressions test-query test-render",
-    "prepublish": "in-publish && run-s build-dev build-min || not-in-publish"
+    "prepublish": "in-publish && run-s build-dev build-min || not-in-publish",
+    "codegen": "node build/generate-style-code.js && flow-node build/generate-struct-arrays.js"
   },
   "files": [
     "build/",
diff --git a/src/data/array_types.js b/src/data/array_types.js
index 4d86ebafe3c..fa105d1061e 100644
--- a/src/data/array_types.js
+++ b/src/data/array_types.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-struct-arrays.js, then run `node build/generate-struct-arrays.js`.
+// This file is generated. Edit build/generate-struct-arrays.js, then run `yarn run codegen`.
 // @flow
 
 const assert = require('assert');
@@ -72,11 +72,12 @@ register('StructArrayLayout4i8', StructArrayLayout4i8);
 
 /**
  * Implementation of the StructArray layout:
- * [0]: Int16[6]
+ * [0]: Int16[2]
+ * [4]: Int16[4]
  *
  * @private
  */
-class StructArrayLayout6i16 extends StructArray {
+class StructArrayLayout2i4i12 extends StructArray {
     uint8: Uint8Array;
     int16: Int16Array;
 
@@ -88,7 +89,7 @@ class StructArrayLayout6i16 extends StructArray {
     emplaceBack(v0: number, v1: number, v2: number, v3: number, v4: number, v5: number) {
         const i = this.length;
         this.resize(i + 1);
-        const o2 = i * 8;
+        const o2 = i * 6;
         this.int16[o2 + 0] = v0;
         this.int16[o2 + 1] = v1;
         this.int16[o2 + 2] = v2;
@@ -100,8 +101,8 @@ class StructArrayLayout6i16 extends StructArray {
 
 }
 
-StructArrayLayout6i16.prototype.bytesPerElement = 16;
-register('StructArrayLayout6i16', StructArrayLayout6i16);
+StructArrayLayout2i4i12.prototype.bytesPerElement = 12;
+register('StructArrayLayout2i4i12', StructArrayLayout2i4i12);
 
 
 /**
@@ -290,11 +291,13 @@ register('StructArrayLayout6i1ul2ui2i24', StructArrayLayout6i1ul2ui2i24);
 
 /**
  * Implementation of the StructArray layout:
- * [0]: Int16[6]
+ * [0]: Int16[2]
+ * [4]: Int16[2]
+ * [8]: Int16[2]
  *
  * @private
  */
-class StructArrayLayout6i12 extends StructArray {
+class StructArrayLayout2i2i2i12 extends StructArray {
     uint8: Uint8Array;
     int16: Int16Array;
 
@@ -318,8 +321,8 @@ class StructArrayLayout6i12 extends StructArray {
 
 }
 
-StructArrayLayout6i12.prototype.bytesPerElement = 12;
-register('StructArrayLayout6i12', StructArrayLayout6i12);
+StructArrayLayout2i2i2i12.prototype.bytesPerElement = 12;
+register('StructArrayLayout2i2i2i12', StructArrayLayout2i2i2i12);
 
 
 /**
@@ -472,7 +475,7 @@ register('StructArrayLayout3i6', StructArrayLayout3i6);
  *
  * @private
  */
-class StructArrayLayout1ul2ui12 extends StructArray {
+class StructArrayLayout1ul2ui8 extends StructArray {
     uint8: Uint8Array;
     uint32: Uint32Array;
     uint16: Uint16Array;
@@ -486,8 +489,8 @@ class StructArrayLayout1ul2ui12 extends StructArray {
     emplaceBack(v0: number, v1: number, v2: number) {
         const i = this.length;
         this.resize(i + 1);
-        const o4 = i * 3;
-        const o2 = i * 6;
+        const o4 = i * 2;
+        const o2 = i * 4;
         this.uint32[o4 + 0] = v0;
         this.uint16[o2 + 2] = v1;
         this.uint16[o2 + 3] = v2;
@@ -496,8 +499,8 @@ class StructArrayLayout1ul2ui12 extends StructArray {
 
 }
 
-StructArrayLayout1ul2ui12.prototype.bytesPerElement = 12;
-register('StructArrayLayout1ul2ui12', StructArrayLayout1ul2ui12);
+StructArrayLayout1ul2ui8.prototype.bytesPerElement = 8;
+register('StructArrayLayout1ul2ui8', StructArrayLayout1ul2ui8);
 
 
 /**
@@ -825,11 +828,11 @@ class FeatureIndexStruct extends Struct {
     set featureIndex(x) { this._structArray.uint32[this._pos4 + 0] = x; }
     get sourceLayerIndex() { return this._structArray.uint16[this._pos2 + 2]; }
     set sourceLayerIndex(x) { this._structArray.uint16[this._pos2 + 2] = x; }
-    get bucketIndex() { return this._structArray.uint16[this._pos2 + 4]; }
-    set bucketIndex(x) { this._structArray.uint16[this._pos2 + 4] = x; }
+    get bucketIndex() { return this._structArray.uint16[this._pos2 + 3]; }
+    set bucketIndex(x) { this._structArray.uint16[this._pos2 + 3] = x; }
 }
 
-FeatureIndexStruct.prototype.size = 12;
+FeatureIndexStruct.prototype.size = 8;
 
 export type FeatureIndex = FeatureIndexStruct;
 
@@ -837,7 +840,7 @@ export type FeatureIndex = FeatureIndexStruct;
 /**
  * @private
  */
-class FeatureIndexArray extends StructArrayLayout1ul2ui12 {
+class FeatureIndexArray extends StructArrayLayout1ul2ui8 {
     /**
      * Return the FeatureIndexStruct at the given location in the array.
      * @param {number} index The index of the element.
@@ -854,18 +857,18 @@ register('FeatureIndexArray', FeatureIndexArray);
 module.exports = {
     StructArrayLayout2i4,
     StructArrayLayout4i8,
-    StructArrayLayout6i16,
+    StructArrayLayout2i4i12,
     StructArrayLayout4i4ub12,
     StructArrayLayout4i4ui16,
     StructArrayLayout3f12,
     StructArrayLayout1ul4,
     StructArrayLayout6i1ul2ui2i24,
-    StructArrayLayout6i12,
+    StructArrayLayout2i2i2i12,
     StructArrayLayout2ub4,
     StructArrayLayout2i2ui3ul3ui2f2ub40,
     StructArrayLayout1f4,
     StructArrayLayout3i6,
-    StructArrayLayout1ul2ui12,
+    StructArrayLayout1ul2ui8,
     StructArrayLayout3ui6,
     StructArrayLayout2ui4,
     StructArrayLayout2f8,
@@ -874,14 +877,14 @@ module.exports = {
     RasterBoundsArray: StructArrayLayout4i8,
     CircleLayoutArray: StructArrayLayout2i4,
     FillLayoutArray: StructArrayLayout2i4,
-    FillExtrusionLayoutArray: StructArrayLayout6i16,
+    FillExtrusionLayoutArray: StructArrayLayout2i4i12,
     HeatmapLayoutArray: StructArrayLayout2i4,
     LineLayoutArray: StructArrayLayout4i4ub12,
     SymbolLayoutArray: StructArrayLayout4i4ui16,
     SymbolDynamicLayoutArray: StructArrayLayout3f12,
     SymbolOpacityArray: StructArrayLayout1ul4,
-    CollisionBoxLayoutArray: StructArrayLayout6i12,
-    CollisionCircleLayoutArray: StructArrayLayout6i12,
+    CollisionBoxLayoutArray: StructArrayLayout2i2i2i12,
+    CollisionCircleLayoutArray: StructArrayLayout2i2i2i12,
     CollisionVertexArray: StructArrayLayout2ub4,
     TriangleIndexArray: StructArrayLayout3ui6,
     LineIndexArray: StructArrayLayout2ui4,
diff --git a/src/data/bucket/fill_extrusion_attributes.js b/src/data/bucket/fill_extrusion_attributes.js
index d64c4b3c0f8..41a8efc6c59 100644
--- a/src/data/bucket/fill_extrusion_attributes.js
+++ b/src/data/bucket/fill_extrusion_attributes.js
@@ -2,6 +2,5 @@
 const {createLayout} = require('../../util/struct_array');
 module.exports = createLayout([
     {name: 'a_pos',          components: 2, type: 'Int16'},
-    {name: 'a_normal',       components: 3, type: 'Int16'},
-    {name: 'a_edgedistance', components: 1, type: 'Int16'}
+    {name: 'a_normal_ed',    components: 4, type: 'Int16'},
 ], 4);
diff --git a/src/data/bucket/fill_extrusion_bucket.js b/src/data/bucket/fill_extrusion_bucket.js
index 485b5f6aded..8759106c238 100644
--- a/src/data/bucket/fill_extrusion_bucket.js
+++ b/src/data/bucket/fill_extrusion_bucket.js
@@ -32,12 +32,11 @@ function addVertex(vertexArray, x, y, nx, ny, nz, t, e) {
         // a_pos
         x,
         y,
-        // a_normal
+        // a_normal_ed: 3-component normal and 1-component edgedistance
         Math.floor(nx * FACTOR) * 2 + t,
         ny * FACTOR * 2,
         nz * FACTOR * 2,
-
-        // a_edgedistance
+        // edgedistance (used for wrapping patterns around extrusion sides)
         Math.round(e)
     );
 }
@@ -107,7 +106,6 @@ class FillExtrusionBucket implements Bucket {
             for (const ring of polygon) {
                 numVertices += ring.length;
             }
-
             let segment = this.segments.prepareSegment(4, this.layoutVertexArray, this.indexArray);
 
             for (const ring of polygon) {
@@ -115,6 +113,10 @@ class FillExtrusionBucket implements Bucket {
                     continue;
                 }
 
+                if (isEntirelyOutside(ring)) {
+                    continue;
+                }
+
                 let edgeDistance = 0;
 
                 for (let p = 0; p < ring.length; p++) {
@@ -129,11 +131,13 @@ class FillExtrusionBucket implements Bucket {
                             }
 
                             const perp = p1.sub(p2)._perp()._unit();
+                            const dist = p2.dist(p1);
+                            if (edgeDistance + dist > 32768) edgeDistance = 0;
 
                             addVertex(this.layoutVertexArray, p1.x, p1.y, perp.x, perp.y, 0, 0, edgeDistance);
                             addVertex(this.layoutVertexArray, p1.x, p1.y, perp.x, perp.y, 0, 1, edgeDistance);
 
-                            edgeDistance += p2.dist(p1);
+                            edgeDistance += dist;
 
                             addVertex(this.layoutVertexArray, p2.x, p2.y, perp.x, perp.y, 0, 0, edgeDistance);
                             addVertex(this.layoutVertexArray, p2.x, p2.y, perp.x, perp.y, 0, 1, edgeDistance);
@@ -203,3 +207,10 @@ function isBoundaryEdge(p1, p2) {
     return (p1.x === p2.x && (p1.x < 0 || p1.x > EXTENT)) ||
         (p1.y === p2.y && (p1.y < 0 || p1.y > EXTENT));
 }
+
+function isEntirelyOutside(ring) {
+    return ring.every(p => p.x < 0) ||
+        ring.every(p => p.x > EXTENT) ||
+        ring.every(p => p.y < 0) ||
+        ring.every(p => p.y > EXTENT);
+}
diff --git a/src/shaders/fill_extrusion.vertex.glsl b/src/shaders/fill_extrusion.vertex.glsl
index 43fc78c11f3..f375d580545 100644
--- a/src/shaders/fill_extrusion.vertex.glsl
+++ b/src/shaders/fill_extrusion.vertex.glsl
@@ -4,8 +4,7 @@ uniform lowp vec3 u_lightpos;
 uniform lowp float u_lightintensity;
 
 attribute vec2 a_pos;
-attribute vec3 a_normal;
-attribute float a_edgedistance;
+attribute vec4 a_normal_ed;
 
 varying vec4 v_color;
 
@@ -19,11 +18,12 @@ void main() {
     #pragma mapbox: initialize lowp float height
     #pragma mapbox: initialize highp vec4 color
 
+    vec3 normal = a_normal_ed.xyz;
+
     base = max(0.0, base);
     height = max(0.0, height);
 
-    float ed = a_edgedistance; // use each attrib in order to not trip a VAO assert
-    float t = mod(a_normal.x, 2.0);
+    float t = mod(normal.x, 2.0);
 
     gl_Position = u_matrix * vec4(a_pos, t > 0.0 ? height : base, 1);
 
@@ -37,7 +37,7 @@ void main() {
     color += ambientlight;
 
     // Calculate cos(theta), where theta is the angle between surface normal and diffuse light ray
-    float directional = clamp(dot(a_normal / 16384.0, u_lightpos), 0.0, 1.0);
+    float directional = clamp(dot(normal / 16384.0, u_lightpos), 0.0, 1.0);
 
     // Adjust directional so that
     // the range of values for highlight/shading is narrower
@@ -46,7 +46,7 @@ void main() {
     directional = mix((1.0 - u_lightintensity), max((1.0 - colorvalue + u_lightintensity), 1.0), directional);
 
     // Add gradient along z axis of side surfaces
-    if (a_normal.y != 0.0) {
+    if (normal.y != 0.0) {
         directional *= clamp((t + base) * pow(height / 150.0, 0.5), mix(0.7, 0.98, 1.0 - u_lightintensity), 1.0);
     }
 
diff --git a/src/shaders/fill_extrusion_pattern.vertex.glsl b/src/shaders/fill_extrusion_pattern.vertex.glsl
index 4cbdfaa3789..253800c8611 100644
--- a/src/shaders/fill_extrusion_pattern.vertex.glsl
+++ b/src/shaders/fill_extrusion_pattern.vertex.glsl
@@ -13,8 +13,7 @@ uniform lowp vec3 u_lightpos;
 uniform lowp float u_lightintensity;
 
 attribute vec2 a_pos;
-attribute vec3 a_normal;
-attribute float a_edgedistance;
+attribute vec4 a_normal_ed;
 
 varying vec2 v_pos_a;
 varying vec2 v_pos_b;
@@ -28,26 +27,29 @@ void main() {
     #pragma mapbox: initialize lowp float base
     #pragma mapbox: initialize lowp float height
 
+    vec3 normal = a_normal_ed.xyz;
+    float edgedistance = a_normal_ed.w;
+
     base = max(0.0, base);
     height = max(0.0, height);
 
-    float t = mod(a_normal.x, 2.0);
+    float t = mod(normal.x, 2.0);
     float z = t > 0.0 ? height : base;
 
     gl_Position = u_matrix * vec4(a_pos, z, 1);
 
-    vec2 pos = a_normal.x == 1.0 && a_normal.y == 0.0 && a_normal.z == 16384.0
+    vec2 pos = normal.x == 1.0 && normal.y == 0.0 && normal.z == 16384.0
         ? a_pos // extrusion top
-        : vec2(a_edgedistance, z * u_height_factor); // extrusion side
+        : vec2(edgedistance, z * u_height_factor); // extrusion side
 
     v_pos_a = get_pattern_pos(u_pixel_coord_upper, u_pixel_coord_lower, u_scale_a * u_pattern_size_a, u_tile_units_to_pixels, pos);
     v_pos_b = get_pattern_pos(u_pixel_coord_upper, u_pixel_coord_lower, u_scale_b * u_pattern_size_b, u_tile_units_to_pixels, pos);
 
     v_lighting = vec4(0.0, 0.0, 0.0, 1.0);
-    float directional = clamp(dot(a_normal / 16383.0, u_lightpos), 0.0, 1.0);
+    float directional = clamp(dot(normal / 16383.0, u_lightpos), 0.0, 1.0);
     directional = mix((1.0 - u_lightintensity), max((0.5 + u_lightintensity), 1.0), directional);
 
-    if (a_normal.y != 0.0) {
+    if (normal.y != 0.0) {
         directional *= clamp((t + base) * pow(height / 150.0, 0.5), mix(0.7, 0.98, 1.0 - u_lightintensity), 1.0);
     }
 
diff --git a/src/style/style_layer/background_style_layer_properties.js b/src/style/style_layer/background_style_layer_properties.js
index d86d3d2d897..ae5677589a2 100644
--- a/src/style/style_layer/background_style_layer_properties.js
+++ b/src/style/style_layer/background_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/circle_style_layer_properties.js b/src/style/style_layer/circle_style_layer_properties.js
index 17788b25910..27e63fbcc85 100644
--- a/src/style/style_layer/circle_style_layer_properties.js
+++ b/src/style/style_layer/circle_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/fill_extrusion_style_layer_properties.js b/src/style/style_layer/fill_extrusion_style_layer_properties.js
index 785f2e9a6cd..7a0189092f4 100644
--- a/src/style/style_layer/fill_extrusion_style_layer_properties.js
+++ b/src/style/style_layer/fill_extrusion_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/fill_style_layer_properties.js b/src/style/style_layer/fill_style_layer_properties.js
index cc428ca8502..da8783d4ad1 100644
--- a/src/style/style_layer/fill_style_layer_properties.js
+++ b/src/style/style_layer/fill_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/heatmap_style_layer_properties.js b/src/style/style_layer/heatmap_style_layer_properties.js
index 53bdae8c5c0..9b7f51da842 100644
--- a/src/style/style_layer/heatmap_style_layer_properties.js
+++ b/src/style/style_layer/heatmap_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/hillshade_style_layer_properties.js b/src/style/style_layer/hillshade_style_layer_properties.js
index 24578df822e..382b2bf7872 100644
--- a/src/style/style_layer/hillshade_style_layer_properties.js
+++ b/src/style/style_layer/hillshade_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/layer_properties.js.ejs b/src/style/style_layer/layer_properties.js.ejs
index 5cd90983daf..b154ccea78f 100644
--- a/src/style/style_layer/layer_properties.js.ejs
+++ b/src/style/style_layer/layer_properties.js.ejs
@@ -3,7 +3,7 @@
   const layoutProperties = locals.layoutProperties;
   const paintProperties = locals.paintProperties;
 -%>
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/line_style_layer_properties.js b/src/style/style_layer/line_style_layer_properties.js
index 48b9a747793..8e89efc77b8 100644
--- a/src/style/style_layer/line_style_layer_properties.js
+++ b/src/style/style_layer/line_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/raster_style_layer_properties.js b/src/style/style_layer/raster_style_layer_properties.js
index cf66430a380..bbe853bf4a9 100644
--- a/src/style/style_layer/raster_style_layer_properties.js
+++ b/src/style/style_layer/raster_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/style/style_layer/symbol_style_layer_properties.js b/src/style/style_layer/symbol_style_layer_properties.js
index 98957edd994..705e76373d5 100644
--- a/src/style/style_layer/symbol_style_layer_properties.js
+++ b/src/style/style_layer/symbol_style_layer_properties.js
@@ -1,4 +1,4 @@
-// This file is generated. Edit build/generate-style-code.js, then run `node build/generate-style-code.js`.
+// This file is generated. Edit build/generate-style-code.js, then run `yarn run codegen`.
 // @flow
 /* eslint-disable */
 
diff --git a/src/util/struct_array.js b/src/util/struct_array.js
index 5c48c932645..5233908840f 100644
--- a/src/util/struct_array.js
+++ b/src/util/struct_array.js
@@ -57,7 +57,8 @@ export type StructArrayMember = {
 
 export type StructArrayLayout = {
     members: Array<StructArrayMember>,
-    size: number
+    size: number,
+    alignment: ?number
 }
 
 export type SerializedStructArray = {
@@ -224,7 +225,8 @@ function createLayout(
 
     return {
         members: layoutMembers,
-        size
+        size,
+        alignment
     };
 }
 
diff --git a/test/unit/util/struct_array.test.js b/test/unit/util/struct_array.test.js
index 7ce85cd3b66..0550bea40c4 100644
--- a/test/unit/util/struct_array.test.js
+++ b/test/unit/util/struct_array.test.js
@@ -2,7 +2,7 @@
 'use strict';
 
 const test = require('mapbox-gl-js-test').test;
-const {StructArrayLayout3i6} = require('../../../src/data/array_types');
+const {StructArrayLayout3i6, FeatureIndexArray} = require('../../../src/data/array_types');
 
 test('StructArray', (t) => {
     class TestArray extends StructArrayLayout3i6 {}
@@ -83,3 +83,40 @@ test('StructArray', (t) => {
 
     t.end();
 });
+
+test('FeatureIndexArray', (t) => {
+    class TestArray extends FeatureIndexArray {}
+
+    t.test('array constructs itself', (t) => {
+        const array = new TestArray();
+        t.equal(array.length, 0);
+        t.ok(array.arrayBuffer);
+        t.end();
+    });
+
+    t.test('emplace and retrieve', (t) => {
+        const array = new TestArray();
+        t.equal(0, array.emplaceBack(1, 7, 3));
+        t.equal(1, array.emplaceBack(4, 2, 5));
+
+        t.equal(array.length, 2);
+
+        const elem0 = array.get(0);
+        t.ok(elem0);
+
+        t.equal(elem0.featureIndex, 1, 'returns correct featureIndex');
+        t.equal(elem0.sourceLayerIndex, 7, 'returns correct sourceLayerIndex');
+        t.equal(elem0.bucketIndex, 3, 'returns correct bucketIndex');
+
+        const elem1 = array.get(1);
+        t.ok(elem1);
+
+        t.equal(elem1.featureIndex, 4, 'returns correct featureIndex');
+        t.equal(elem1.sourceLayerIndex, 2, 'returns correct sourceLayerIndex');
+        t.equal(elem1.bucketIndex, 5, 'returns correct bucketIndex');
+
+        t.end();
+    });
+
+    t.end();
+});