fix: concat body in res.end

[ErisDS]

I'm not familiar with flow and am unable to get the tests to run locally as I just get a bunch of "Cannot resolve module lodash" style errors.

However I believe this will demonstrate the issue and fix it!

I have the fix I outlined in #26 working locally.

---

fixes: #26

• added a test to demonstrate how write and end are used together that should fail with the current code
• use the already bound write method to ensure that body is concatenated correctly
• this seemed like the quickest way to do this, as callback isn't used

[antongolub]

Hey, @ErisDS,

Nice catch, thanks a lot.

lgtm, but now some tests are broken, let's try to fix: I suggest using this.write instead of write.

    this.end = (chunk: IData, encoding?: ?string): IResponse => {
      this.write(chunk, encoding)
      this.emit('finish')
      return this
    }

Cannot resolve module lodash

Flow requires manual setup for external libdefs from the special registry (it's smth like DT for TS) via CLI: flow-typed install express@4.x.x lodash@4.x.x setprototypeof@1.x.x. They cannot simply be declared as package dev deps. Using post-install is also a bad option for obvious reasons.

[antongolub]

🎉 This PR is included in version 1.6.5 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• v1.6.5

Your semantic-release bot 📦🚀

[ErisDS]

I'm sorry I didn't manage to come back to this yesterday, I was trying to wrap up the tool I'm building so I could be sure this worked.

I have found another, different issue which I'll raise and also try to see if I can fix these tests.

Thanks for merging in the meantime, do you think the broken tests are actually wrong or that they're just not that important?