How to use the @theia/editor/lib/browser.EditorCommands.INDENT_USING_SPACES function in @theia/editor

protected registerEditorCommandHandlers(): void {
        this.registry.registerHandler(EditorCommands.SHOW_REFERENCES.id, this.newShowReferenceHandler());
        this.registry.registerHandler(EditorCommands.CONFIG_INDENTATION.id, this.newConfigIndentationHandler());
        this.registry.registerHandler(EditorCommands.CONFIG_EOL.id, this.newConfigEolHandler());
        this.registry.registerHandler(EditorCommands.INDENT_USING_SPACES.id, this.newConfigTabSizeHandler(true));
        this.registry.registerHandler(EditorCommands.INDENT_USING_TABS.id, this.newConfigTabSizeHandler(false));
    }