Add MongoMemoryReplSet class, tests, and docs

[jloveridge]

I have implemented the MongoMemoryReplSet feature roughly as I described in #79. Please review and let me know if there is anything you feel needs to be changed. This, in combination with my previously merged PR should complete #74.

On a side note, flow typings still really seem to be much less robust/complete than what is available for TypeScript. I would have expected them to have caught up by now. Glad I use TypeScript normally, the more accurate code insight/completion it provides is amazing.

[nodkz]

Impressive changes!

Also, I saw your pain with flow typescript and vscode ))) 4 days ago I did the same thing.

Historically my open-source libs started from graphql-compose. It takes graphql-js package from Facebook and provides a more convenient way for type creation. And I should have deep static type checking between this libs for fast catching of changes and resolving new problems. And works amazingly cool, i need several hours to determine what need to do with breaking changes introduced in an upstream package which written with Flow.

Anyway, I feel that both TypeScript and Flowtype are amazing tools. And we as lib authors should support both of them as close to code as possible. Flow is younger than Typescript, but if there was no such competition between them, we would have had something much worse than now.

[nodkz]

We should move fast, I see that your code is very clear and stable.

Real testing I will do tomorrow at work. And if I'll found any problems then make them via small additional fixes ;)

Thanks for the AMAZING work!!!!

[nodkz]

🎉 This PR is included in version 2.4.0 🎉

The release is available on:

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

Your semantic-release bot 📦🚀

[jloveridge]

As to supporting both type systems I think that if I bother to do such a thing in my future projects I will write the code in TypeScript, which has better typings available today, and then make an equivalent Flowtype interface definition file, which would be easily adapted from the .d.ts files that compiling the TypeScript would create. In most cases it would simply require a duplication of the file as filename.js.flow with only minor adjustments (such as the import type syntax). Added benefit, the generated JavaScript would also have source maps to improve the debugging experience.

It would be awesome if the transformation could be handled automatically but when I tried to use flowgen to do such a transformation it died a horrible death.