uniappx uts读取页面跳转传递过来的url参数 报错

    onLoad((options : OnLoadOptions) => {  
        console.log('--onLoad', options)  
        if (options['url'] != null) {  
            //console.log('--d',typeof options)  
            url.value = decodeURIComponent(options['url']) as string  
        }  
    })

19:52:06.730 [plugin:uni:app-uts] 编译失败  
19:52:06.730 ‌error: 类型不匹配: 推断类型是String?（可为空的String），但预期的是String。‌  
19:52:06.730 at pages/index/web.uvue:15:34  
19:52:06.730 13 |    if (options['url'] != null) {  
19:52:06.730 14 |     //console.log('--d',typeof options)  
19:52:06.730 15 |     url.value = decodeURIComponent(options['url']) as string  
19:52:06.730    |                                    ^  
19:52:06.730 16 |    }  
19:52:06.730 17 |   })