[Enhancement] Add support of TypeScript (.ts) for test files

[zenkdev]

Is your feature request related to a problem? Please describe.

I'm using Nightwatch with TypeScript and Babel to run my end2end, However, Nightwatch doesn't support ".ts" file extensions for test files out of the box. Is it possible to add this feature?

Describe the solution you'd like

Describe how the solution will work

Describe alternatives you've considered

Additional context

[reallymello]

When I evangelize Nightwatch at work this is a common thing that inevitably comes up in the conversation. "Wow! This is great! Can I write the tests in TypeScript instead?"
Personally, it isn't a big deal for me, but there are a lot of people that love their TypeScript and would help those potential adopters more readily come onboard.

[zenkdev]

Great. Can you explain your solution? Because I have one, but not sure if it is ok.

[beatfactor]

If it's only a matter of allowing loading of .ts files, we can do that easily.

[zenkdev]

Yes, it's not allowed to use .ts files in NW directly. It would great if you added such an opportunity.

[zenkdev]

Hi. Any updates on this issue?

[beatfactor]

@trailblazer2006 we will add it soon, thanks for your patience.

[lloiser]

FYI I have made an attempt a while ago: #2064
I also created the typescript definitions for it: https://github.com/DefinitelyTyped/DefinitelyTyped/blob/master/types/nightwatch/index.d.ts

[zenkdev]

Thanks to everyone. BTW @lloiser my current solution that I use in our projects is exactly the same as yours. I was also thinking about adding some CLI parameter for the extension, like in babel-node, so as not to make breaking changes to Nightwatch.

[beatfactor]

Can you guys have a look at this PR and let me know if this is enough? We can get it merged and released in v1.5.2 in a few days.

[beatfactor]

Also if y'all could suggest how to add some unit tests and some examples with typescript, that would be appreciated.