Question

在将myTypes常量写入名为my-component.js的文件中的某个位置时，如下所示：

import React from 'react'
import { View } from 'react-native'
import PropTypes from 'prop-types'

export const myTypes = {
  activeColor: PropTypes.string,
  color: PropTypes.string,
  fontFamily: PropTypes.string,
  fontSize: PropTypes.number,
  fontWeight: PropTypes.oneOfType([PropTypes.string, PropTypes.number]),
  height: PropTypes.number,
  icon: PropTypes.node,
  iconOverlay: PropTypes.node,
  marginBottom: PropTypes.number,
  marginLeft: PropTypes.number,
  marginRight: PropTypes.number,
  marginTop: PropTypes.number,
  maxHeight: PropTypes.number,
  minHeight: PropTypes.number,
  onBlur: PropTypes.func,
  onChangeText: PropTypes.func,
  paddingBottom: PropTypes.number,
  paddingLeft: PropTypes.number,
  paddingRight: PropTypes.number,
  paddingTop: PropTypes.number
}

export default class MyComponent extends React.Component {
  static propTypes = myTypes

  render () {
    return (
      <View></View>
    );
  }
}

考虑您要使用myTypes（在用type-script编写的另一个文件中）作为启用IDE自动完成的类型或帮助程序，您将如何做？

我尝试过的是：

import MyComponent, { myTypes } from 'my-component';

const dark_theme_properties: myTypes = {
  activeColor: 'green'
};

但是，当然会出现'myTypes' refers to a value, but is being used as a type here. ts(2749)错误。

编辑：旧标题中的问题是“ How to use a value as a type definition in typescript?”，这要归功于我现在知道的答案：

const dark_theme_properties: typeof myTypes = {
  activeColor: 'green'
  // ...
};

Answer 1

由于您使用的是Typescript，因此可以将界面创建为Type-helper和自动补全功能。

import React from 'react'

export interface myTypes {
  activeColor: string;
  color: string;
  fontFamily: string;
  fontSize: number;
  fontWeight: string | number;
  height: number;
  icon: React.ReactNode;
  iconOverlay: React.ReactNode;
  marginBottom: number;
  marginLeft: number;
  marginRight: number;
  marginTop: number;
  maxHeight: number;
  minHeight: number;
  onBlur: () => void;
  onChangeText: () => void;
  paddingBottom: number;
  paddingLeft: number;
  paddingRight: number;
  paddingTop: number;
}

import { myTypes } from "my-types-interface";

const dark_theme_properties: myTypes = {
  activeColor: "green",
  ...
};

Answer 2

使用InferProps中的@types/prop-types，例如：

import PropTypes, { InferProps } from 'prop-types'

const myTypes = {
  activeColor: PropTypes.string,
  // ...
}

type MyComponentProps = InferProps<typeof myTypes>

const dark_theme_properties: MyComponentProps = {
  activeColor: 'green'
  // ...
};

Answer 3

https://fettblog.eu/typescript-react/prop-types/

import PropTypes, { InferProps } from "prop-types";
import React from 'react';


function Article({
  title,
  price
}: InferProps<typeof Article.propTypes>) {
  return (
    <div className="article">
      <h1>{title}</h1>
      <span>Priced at (incl VAT): {price * 1.2}</span>
    </div>
  );
}

Article.propTypes = {
  title: PropTypes.string.isRequired,
  price: PropTypes.number.isRequired
};

export default Article;

如何使用prop-types作为打字稿的类型定义？

3 个答案: