try fix

vec3/vec3-tests.ts

@@ -1,3 +1,2 @@
-/// <reference path="./vec3.d.ts" />
 import * as vec3 from "vec3"
-let myVector = new vec3.Vec3(10, 10, 10);
+let myVector: vec3.Vec3 = new vec3.Vec3(10, 10, 10);

vec3/vec3.d.ts

@@ -1,5 +1,5 @@
 declare module "vec3"{
-    export class Vec3{
+    class Vec3{
         constructor(x: number, y: number, z: number);
         constructor(location: number[]);
         constructor(location: {x: number; y: number; z: number});