Redux DevTools does not display content of Map objects in Angular

[sarihuminer]

It appears that Redux DevTools does not correctly display the contents of Map objects in an Angular application. When viewing the store state in the DevTools, Map objects appear as empty or do not show their key-value pairs.

Steps to Reproduce:

Create an Angular application with Redux/NgRx and Redux DevTools enabled.
Add a property of type Map<number, string[]> to the store state, for example:
typescript

const initialState = { ids: new Map<number, string[]>([[4, ['111111111111']]]) };

Update the state using an action.
Open Redux DevTools and inspect the state.

the state look null,but itsnot right!

Expected Behavior:
The Map should display its key-value pairs, like:

ids: Map(1) { 4 => ['111111111111'] }

[Methuselah96]

You need to turn on the serialize option to see Map previews.