Modal Plugin

1. Register plugin in the root js-file

import Vue from "vue";
import ModalPlugin from "@/plugins/modal/ModalPlugin";
...
Vue.use(ModalPlugin);
...
new Vue({ ... })

2. Use <modals-wrapper /> inside vue-component as a root modal-component (no need to import and register it, plugin does it globally).
3. To create/show/hide modal:

import ModalDialog from "@/ui/modals/ModalDialog";
methods: {
  ...
  myShowModalFn() {
    this.$modal.create({
      // The names of properties do matter!
      id: "foo", // Required, unique, string or number
      modalComponent: ModalDialog, // Required, vue-component
      text: "Lorem ipsum", // Optional
      props: { 
        myFirstPropName: myFirstPropValue,
        mySecondPropName: mySecondPropValue,
        ....
      }, // Optional
      onConfirm: someFn, // Optional, async fn is ok
      onCancel: someFn, //  Optional, async fn is ok
    });
    this.$modal.show("foo"); // Pass an id of modal here
  },
  myHideModalFn() {
    this.$modal.hide("foo"); // Pass an id of modal here
  }
}

4. Modal-component (ModalDialog in example) gets from parent such props:

    disabled: {
      type: Boolean,
    },
    text: {
      type: String,
    },
    isVisible: {
      type: Boolean,
    },

5. Modal-component (ModalDialog in example) must emit "cancel" and "confirm" events on related buttons click.
6. Modal-component (ModalDialog in example) does not get onConfirm and onCancel functions. These functions run in ModalsWrapper.
7. ModalsWrapper is transparent for custom-events and for props.
8. For testing create, show, hide methods use spyOn:

    // wrapper here is the VTU-wrapper for component where the modal was created
    const modalCreateSpyOn = jest.spyOn(wrapper.vm.$modal, "create");
    // do something to show a modal (click on button for instance)
    expect(modalCreateSpyOn).toHaveBeenCalled();
    expect(modalCreateSpyOn).toHaveBeenCalledWith({
        id: `your-expected-id`,
        modalComponent: `YourExpectedComponent`,
        text: `your-expected-text`,
        onCancel: expect.any(Function), // or particular fn
        onConfirm: expect.any(Function), // or particular fn
    });
    modalCreateSpyOn.mockReset();

9. Testing of onConfirm/onCancel methods should be done in the component that includes <modals-wrapper>.