[Discover] Migrate field_calculator.js file to field_calculator.ts

[kertal]

The year is 2022AD. Discover is entirely occupied by the TS. Well not entirely! One small village of indomitable JS still holds out against the invader. And life is not easy for developers who garrison the fortified camps of common, public, server and .storybook…

So the target would be to migrate field_calculator.js to field_calculator.ts.

Note that this is the last significant file in JS, some small villages like jest.config.js can stay.

https://github.com/elastic/kibana/blob/main/src/plugins/discover/public/application/main/components/sidebar/lib/field_calculator.js

[elasticmachine]

Pinging @elastic/kibana-data-discovery (Team:DataDiscovery)

[JorgChrist]

Hey! Can I work on that? I think it's an interesting task.

[JorgChrist]

@kertal Sorry for asking again but may I work on this?

[kertal]

@JorgChrist Sure you can, but there's also another user working on it currently: https://github.com/elastic/kibana/pull/138142

[AAYUSH-droid]

hey @kertal can i work on this issue aswell?

[kertal]

checking @farjad-akhan, will you iterate on your PR?

[farjad-akhan]

checking @farjad-akhan, will you iterate on your PR?

I have closed my PR

[kertal]

thx for your effort @farjad-akhan , @JorgChrist or @AAYUSH-droid , this is free to take. note that it's not sufficient to convert the file to TypeScript, but it's also necessary to find the right types we're using. You would need to check how the function is used, an there you shall find what you need.

[JorgChrist]

@kertal Did farjad drop it? I can start working on it. Can you assign me?