Util dependency not specified in package.json

[vitorsgomes]

In the file lib/avltree.js there is a require for util, but this lib was never specified as a dependency in package.json.

When trying to use node-binary-search-tree on a project that don't have util as a dependency it's generate an error.

[amaramth]

How do you have a project that doesn't have util as a dependency?

[Alttaf]

I have a similar problem in a react native project, when including binary tree it complains about being unable to resolve util in avltree.js, understood this is native node, but how could this happen?

[Alttaf]

this could be from the above facebook/react-native#526, seems like it is a react native issue you have to npm install util as a workaround

[dinithminura]

@Alttaf, Yes, that solution works!

[marcolino]

I suppose you miss a util dependency in your package.json... Please add it...

[amaramth]

@marcolino util is built in

[marcolino]

What do you mean by builtin? If I do not add it to my project dependencies, I can't build my project, which has node-binary-search-tree as a sub-sub-sub dependency... :-(

[JamesMGreene]

@alice0meta means that util is a core Node.js module. Project dependencies are external userland modules from NPM.

This is strictly an incompatibility with React Native not fully supporting a Node.js-compatible environment, and it is going to be extremely common among many Node modules you try to require unless they have been browserify-ed (or intentionally made compatible with React Native) since depending on such core modules like util (for inherits, usually) or events (for EventEmitter) is extremely common.

[deive]

I have made a pull request that simply copies the inherits method from node.js utils to customUtils, so there is no longer a dependency on the node module. The correct way of doing this is to upgrade to ES6 as inherits is deprecated anyway, but this is simple and fast... #17 (useful if you don't want/need the utils package - as mentioned by @Alttaf)