Gracefully handle "property is missing in interface with index signature"?

[yenshih]

TypeScript Version: 2.4.1

Code

import { combineReducers } from 'redux'
import { routerReducer as router } from 'react-router-redux'

const rootReducer = combineReducer<IState>({
    router,
    ...otherReducers
})

/*
export interface Action {
  type: any;
}
export interface AnyAction extends Action {
  // Allows any extra properties to be defined in an action.
  [extraProps: string]: any;
}
export interface RouterAction extends Action {
    type: typeof CALL_HISTORY_METHOD;
    payload: LocationActionPayload;
}

Error:
Type 'AnyAction' is not assignable to type 'RouterAction'.
Property 'payload' is missing in type 'AnyAction'.
*/

Expected behavior:
Maybe no error?
I'm not sure if there's any graceful solution to this problem, I mean without using 'any' type assertion.
Actual behavior:
Type 'AnyAction' is not assignable to type 'RouterAction'.
Property 'payload' is missing in type 'AnyAction'.

[SimonMeskens]

Why aren't you just using any instead of AnyAction, since they are exactly the same? I don't understand why AnyAction exists at all when you typed it to mean: "objects that are assignable to this interface can have any properties".

Is it just because AnyAction gives you code completion for "type"?

In any case, I wouldn't want the language to allow this as it would make indexed types useless (they would all turn into type any)

[yenshih]

That's exactly what I thought!
I'd like make a PR to @types/redux repo. THANKS :)