How to use the esp-js-ui.SystemContainerConst.module_loader function in esp-js-ui

SystemContainerConst.region_manager
            )
            .singleton();
        this._container
            .register(ShellModuleContainerConst.blotter_region, SingleItemRegionModel)
            .inject(
                {resolver: LiteralResolver.resolverName, value: RegionNames.blotterRegion},
                SystemContainerConst.router,
                SystemContainerConst.region_manager
            )
            .singleton();
        this._container
            .register(ShellModuleContainerConst.shell_model, ShellModel)
            .inject(
                SystemContainerConst.router,
                SystemContainerConst.module_loader,
                ShellModuleContainerConst.workspace_region,
                ShellModuleContainerConst.blotter_region
            );
    }

SystemContainerConst.region_manager
            )
            .singleton();
        this._container
            .register(ShellModuleContainerConst.blotter_region, SingleItemRegionModel)
            .inject(
                {resolver:LiteralResolver.resolverName, value: RegionNames.blotterRegion},
                SystemContainerConst.router,
                SystemContainerConst.region_manager
            )
            .singleton();
        this._container
            .register(ShellModuleContainerConst.shell_model, ShellModel)
            .inject(
                SystemContainerConst.router,
                SystemContainerConst.module_loader,
                ShellModuleContainerConst.workspace_region,
                ShellModuleContainerConst.blotter_region
            );
    }