diff --git a/bezier-js/bezier-js-tests.ts b/bezier-js/bezier-js-tests.ts
index 54c629d11b..2f9f2685a2 100644
--- a/bezier-js/bezier-js-tests.ts
+++ b/bezier-js/bezier-js-tests.ts
@@ -1,27 +1,29 @@
 /// <reference path="./bezier-js.d.ts" />
 
 function test() {
-    
+
     var bezierjs: typeof BezierJs;
-    
-    var bezier = new bezierjs.Bezier([1,2,3,4]);
+
+    var bezier = new bezierjs.Bezier([1, 2, 3, 4]);
     var cap = new bezierjs.BezierCap([]);
     var point: BezierJs.Point = { x: 0, y: 0 };
     var utils = bezier.getUtils();
-    var line: BezierJs.Line = { p1: { x:0, y: 0}, p2: {x:1, y: 1}};
+    var line: BezierJs.Line = { p1: { x: 0, y: 0 }, p2: { x: 1, y: 1 } };
     var abc: BezierJs.ABC = { A: null, B: null, C: null };
     var arc: BezierJs.Arc = { e: 0, s: 0, x: 0, y: 0, r: 1 };
     var bbox: BezierJs.BBox = bezier.bbox();
-    var closest: BezierJs.Closest = { mdist: 1, mpos: 0 };    
-    var inflection: BezierJs.Inflection = { values: null, x: [0], y: [0], z:[0] };
+    var closest: BezierJs.Closest = { mdist: 1, mpos: 0 };
+    var inflection: BezierJs.Inflection = { values: null, x: [0], y: [0], z: [0] };
     var minmax: BezierJs.MinMax = { min: 0, max: 0 };
     var offset: BezierJs.Offset = { x: 0, y: 0, c: point, n: point };
     var pair: BezierJs.Pair = { left: bezier, right: bezier };
     var poly: BezierJs.PolyBezier = bezier.outline(1);
     var projection: BezierJs.Projection = { x: 0, y: 0, t: 9, d: 4 };
-    var shape: BezierJs.Shape = { startcap: cap, endcap: cap, forward: bezier, back: bezier, bbox: bbox };
+    var shape: BezierJs.Shape = {
+        startcap: cap, endcap: cap, forward: bezier, back: bezier, bbox: bbox, intersections: function (shape) { return [[0]]; }
+    };
     var split: BezierJs.Split = { left: bezier, right: bezier, span: [point] };
-    
+
     bezier.arcs();
     bezier.clockwise;
     bezier.compute(.5);
@@ -36,10 +38,10 @@ function test() {
     bezier.length();
     bezier.lineIntersects(line);
     bezier.normal(0);
-    bezier.offset(1,2);
+    bezier.offset(1, 2);
     bezier.on(point, 0);
     bezier.order = 5;
-    bezier.outlineshapes(1,3);
+    bezier.outlineshapes(1, 3);
     bezier.overlaps(bezier);
     bezier.point(9);
     bezier.project(point);
@@ -52,9 +54,9 @@ function test() {
     bezier.split(0.5).left;
     bezier.toSVG();
     bezier.update();
-    
+
     cap.virtual = true;
-    
+
     poly.addCurve(bezier);
     poly.bbox();
     poly.curve(7);
@@ -62,12 +64,12 @@ function test() {
     poly.length();
     poly.offset(9).points[0].y;
     poly.points[0];
-    
+
     utils.abcratio(0, 1);
     utils.align([point], line);
     utils.angle(point, point, point);
     utils.approximately(5, 7, .001);
-    utils.arcfn(1, function(){});
+    utils.arcfn(1, function () { });
     utils.bboxoverlap(bbox, bbox);
     utils.between(0, 0, 1);
     utils.closest([point], point);
@@ -78,7 +80,7 @@ function test() {
     utils.findbbox([bezier]);
     utils.getccenter(point, point, point);
     utils.getminmax(bezier, 'x', [0]);
-    utils.length(function(){});
+    utils.length(function () { });
     utils.lerp(1, point, point);
     utils.lli(offset, offset);
     utils.lli4(point, point, point, point);
@@ -92,5 +94,5 @@ function test() {
     utils.roots([point], line);
     utils.round(.999, .001);
     utils.shapeintersections(shape, bbox, shape, bbox);
-    
+
 }
\ No newline at end of file
diff --git a/bezier-js/bezier-js.d.ts b/bezier-js/bezier-js.d.ts
index 8256f4ce99..dfc699bc15 100644
--- a/bezier-js/bezier-js.d.ts
+++ b/bezier-js/bezier-js.d.ts
@@ -57,6 +57,7 @@ declare module BezierJs {
         back: Bezier;
         endcap: BezierCap;
         bbox: BBox;
+        intersections: (shape: Shape) => string[][] | number[][];
     }
     interface ABC {
         A: Point;
@@ -76,8 +77,8 @@ declare module BezierJs {
      *
      */
     class Bezier {
-        clockwise: boolean;
         private _linear;
+        clockwise: boolean;
         _3d: boolean;
         _t1: number;
         _t2: number;
@@ -128,12 +129,12 @@ declare module BezierJs {
         scale(d: Function): Bezier;
         scale(d: number): Bezier;
         outline(d1: number, d2?: number, d3?: number, d4?: number): PolyBezier;
-        outlineshapes(d1: number, d2: number): Shape[];
-        intersects(curve: Bezier): string[] | number[];
+        outlineshapes(d1: number, d2: number, curveIntersectionThreshold?: number): Shape[];
+        intersects(curve: Bezier, curveIntersectionThreshold?: number): string[] | number[];
         intersects(curve: Line): string[] | number[];
         lineIntersects(line: Line): number[];
-        selfintersects(): string[];
-        curveintersects(c1: Bezier[], c2: Bezier[]): string[];
+        selfintersects(curveIntersectionThreshold?: number): string[];
+        curveintersects(c1: Bezier[], c2: Bezier[], curveIntersectionThreshold?: number): string[];
         arcs(errorThreshold?: number): Arc[];
         private _error(pc, np1, s, e);
         private _iterate(errorThreshold, circles);
@@ -165,8 +166,8 @@ declare module BezierJs.utils {
     function lli(v1: Offset, v2: Offset): Point;
     function makeline(p1: Point, p2: Point): Bezier;
     function findbbox(sections: Bezier[]): BBox;
-    function shapeintersections(s1: Shape, bbox1: BBox, s2: Shape, bbox2: BBox): string[][] | number[][];
-    function makeshape(forward: Bezier, back: Bezier): Shape;
+    function shapeintersections(s1: Shape, bbox1: BBox, s2: Shape, bbox2: BBox, curveIntersectionThreshold?: number): string[][] | number[][];
+    function makeshape(forward: Bezier, back: Bezier, curveIntersectionThreshold?: number): Shape;
     function getminmax(curve: Bezier, d: string, list: number[]): MinMax;
     function align(points: Point[], line: Line): Point[];
     function roots(points: Point[], line: Line): number[];
@@ -174,7 +175,7 @@ declare module BezierJs.utils {
     function inflections(points: Point[]): number[];
     function bboxoverlap(b1: BBox, b2: BBox): boolean;
     function expandbox(bbox: BBox, _bbox: BBox): void;
-    function pairiteration(c1: Bezier, c2: Bezier): string[];
+    function pairiteration(c1: Bezier, c2: Bezier, curveIntersectionThreshold?: number): string[];
     function getccenter(p1: Point, p2: Point, p3: Point): Arc;
 }
 declare module BezierJs {