how to add keys to a dictionary in Typescript?

By Bahar Mohammadi

I have the following property in my typescript view model, how do I add keys to it?
_flatListRowsLookupByMediatype: { [key: string]: Array } = {};

I have _flatListRowsLookupByMediatype[key] = value;
but it overwrites the previous key everytime I call that method.

Source: Stack Overflow

    

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