Fix typings to allow using interfaces over types

[leonadler]

Works:

type ActionBranches = {
    auth: AuthStateActions;
    editor: EditorStateActions;
    project: ProjectStateActions;
};

Does not work:

interface ActionBranches {
    auth: AuthStateActions;
    editor: EditorStateActions;
    project: ProjectStateActions;
};

Breaks linter rule interface-over-type-literal.