I need to define env-vars in the sidecar runtime-env in order to make SQS calls go via a http-proxy.
This is not possible today.
it could have syntax of dapr.io/env/varname=value and be placed in the annotations.

/area runtime

Describe the feature

Allows for controlling env-vars of the sidecar.

Release Note

Implement + update docs.

Add a new schematic to generate:

A service that extends ComponentStore
A spec file if requested
Maybe an inlined interface for the default type

Describe any alternatives/workarounds you're current

Is your feature request related to a problem? Please describe.
Currently, migrating from another library requires you to do a manual comparison of samples from both libraries to fill in the gaps. It would be nice to have documentation for people migrating from other popular state management solutions, such as ChangeNotifier, StateNotifier, MobX, or Redux.

Describe the solution you'd like

When I use removeItem state operator then TypeScript complains that message object can be possibly undefined even though I specified the type for removeItem operator. I could fix the issue with optional chaining but that is not possible if I want to use a utility library like Ramda

![image](https://user-images.githubusercontent.com/14946081/104027016-135aed80-51c7-11eb-9316-9b3dbf5b79bf

what is prefer way to add relation and remove relation? I found example as below, but I did't find any document about the two methods.

 case 'ADD_AUTHOR_TO_BOOK':
        Book.withId(action.payload.bookId).authors.add(action.payload.author);  // add new entity ,  add relation?  this doesn't work.
        break;
    case 'REMOVE_AUTHOR_FROM_BOOK':
        Book.withId(action.payload.bo

I'm submitting a...

[ ] Regression (a behavior that used to work and stopped working in a new release)
[ ] Bug report  
[ ] Performance issue
[X] Feature request
[ ] Documentation issue or request
[ ] Support request
[ ] Other... Please describe:

I have a very big app and do not want to make a placeholder for each screen I would like to provide context to about what is loading. (And also do not want a general 'loading' message). Is there currently a way to change the title/subtitle easily for each ViewController, from the ViewController itself?

This needs to be done for:

• mobx
• flutter_mobx
• mobx_codegen

I would love to have native examples of all the state systems in https://snack.expo.io/

This is a bit of a haul, help needed.