Change log - quadtree-lib 1.0.9 Fixed Relaxed the QuadtreeItem type Fix mass demo input reference 1.0.8 Added Clear function Javascript linter (Eslint) Movement demo Demo .js refactoring 1.0.7 Added Coffeescript linter (http://www.coffeelint.org/) Unobserve elements on removal Add onCollision method 1.0.6 Added Add changelog [Feature] Allow negative quadtree coordinates 1.0.5 Added [Feature] #2 : Allow negative x and y values Changed upgrade devDeps Fixed readme typos 1.0.4 Fixed fix critical bundling issue 1.0.3 Added proper UMD bundling Fixed fixed sourcemaps fixed assets 1.0.2 Added Typescript support with a declaration file [doc] Add github corner [demo] collisions / add counters Fixed Collision demo : prevent div resize out of bounds. [demo] collisions / add buttons & chrome bounding box fix 1.0.1 Added Pretty print function. Fixed fix removal not splicing the right array 1.0.0 First stable version.