跪求大侠这个箭头函数里的参数如何解释？

Question

import React from 'react';import { StyleSheet, Text } from 'react-native';/** * Used across examples as a screen placeholder. */import type { Children } from 'react';const SampleText = ({children}: { children?: Children }) => (  <Text style={styles.sampleText}>ww{children}</Text>);export default SampleText;const styles = StyleSheet.create({  sampleText: {    margin: 14,  },});({children}: { children?: Children })括号里的是啥意思？感觉不像三目运算符，谢谢！

Answer 1

这是flow的语法，表示children是Children类型的可选属性
详见Interface Properties