如何纠正流量警告：解构（缺少注释） [英] How to correct flow warning: destructuring (Missing annotation)

问题描述

我正在编写一个小型的React Native应用程序，我正在尝试使用Flow，但我无法在任何地方获得适当的教程。

I'm writing a small React Native app and I'm trying to use Flow, but I can't really get a proper tutorial about it anywhere.

我一直收到错误： destructuring（Missing annotation）关于（{station}）的第1行代码：

I keep getting the error: destructuring (Missing annotation) about the ({ station }) in the 1st line of this code:

const StationDetail = ({ station }) => {
  const {
    code,
    label,
  } = station;

station 是一个 json响应和代码和标签是字符串里面那个 json 。

station is a json response and code and label are strings inside that json.

如何修复错误/警告？

推荐答案

我会把它写成

type StationType = {
  code: String,
  label: String,
}

function StationDetail({ station } : {station : StationType}) => {
  const {
    code,
    label,
} = station;

必须声明函数接受的对象参数的类型。

It's necessary to declare the type of the object parameter that the function accepts.

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