Not compatible with chai v4

[nunof07]

This code:

import chai = require("chai");
import { expect } from 'chai';
import chaiIterator = require("chai-iterator");

chai.use(chaiIterator);

expect([2, 3, 5]).to.iterate.for.lengthOf(3);

Throws the following error.

AssertionError: expected undefined to be iterable

Here is a repo with reproduction: https://github.com/nunof07/chai-iterator-test

Can't quite figure out is going wrong. _obj is undefined in Assertion.addProperty.

[nunof07]

After some testing I think it's because I'm using chai v4.

This plugin doesn't seem compatible with the latest chai version.

I've updated the title of the issue to reflect that.

[harrysarson]

I have looked a bit into this, something breaks in chai when the to property is accessed but it only breaks when using the plugin. Here is an example:

https://runkit.com/harrysarson/chai-to-does-not-work-with-chai-iterator

Will look into this a bit more in a bit.

[harrysarson]

The problem is that the chainable method lengthOf is overwritten using overwriteMethod instead of overwriteChainableMethod.

I will make a pr.

[harrysarson]

@mcmath Could you review #17? I would like to be able to upgrade chai to v4.

[harrysarson]

ping @mcmath