Encountering challenges while transitioning from ngrx version 2 to version 4, specifically related to typing in array de-structuring

The error indicates a missing comma after the action parameter in the .map.

Another error pops up when hovering over DataActions.AddDataAction, displaying 

Tuple type '[Action, AppStore]' with length '2' cannot be assigned to tuple with length '5'

@Effect() addData$ = this.actions$
    .ofType(DataActions.ADD_DATA)
    .withLatestFrom(this.store$)
    .map(([action: DataActions.AddDataAction, store: AppState]) => [action.payload, reducer.dataResults(store)])
    .etc...

Listed below are the relevant packages along with their versions from my package.json file:

"@ngrx/effects": "^4.1.1",
"@ngrx/router-store": "^4.1.1",
"@ngrx/store": "^4.1.1",
"@ngrx/store-devtools": "^4.1.1",
"typescript": "~2.4.0",
angulartypescriptngrxngrx-effectsngrx-store-4.0

Answer №1

The function withLastFrom() returns a Tuple type, and in order to specify the type of each element within a Tuple, we must use the following syntax:

map(([action, store]: [DataActions.AddDataAction, AppState])=>

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