How to use the sprotty.RequestModelAction function in sprotty

function requestModelAction() : RequestModelAction {
        return new RequestModelAction({ 'target' : getTarget()});
    }
}

websocket.addEventListener('open', event => {
    actionDispatcher.dispatch(new RequestModelAction({
        sourceUri: `file://${examplePath}`,
        diagramType: "workflow-diagram",
    }));
    actionDispatcher.dispatch(new RequestOperationsAction());
    actionDispatcher.dispatch(new RequestTypeHintsAction("workflow-diagram"));
});

protected initializeSprotty() {
        const modelSource = this.diContainer.get(TYPES.ModelSource);
        if (modelSource instanceof DiagramServer)
            modelSource.clientId = this.id;
        if (modelSource instanceof GLSPTheiaDiagramServer && this.connector)
            this.connector.connect(modelSource);
        this.disposed.connect(() => {
            if (modelSource instanceof GLSPTheiaDiagramServer && this.connector)
                this.connector.disconnect(modelSource);
        });
        this.actionDispatcher.dispatch(new RequestModelAction({
            sourceUri: this.options.uri,
            diagramType: this.options.diagramType,
            needsClientLayout: 'true'
        }));

        this.actionDispatcher.dispatch(new RequestOperationsAction());
        this.actionDispatcher.dispatch(new RequestTypeHintsAction());
    }
}