使用Visual Studio Code和typescript 开发调试React Native项目

关于

React Native

的详细介绍我就不叙述了，他是使用js构建原声app的开发框架。一次变编码多平台运行，非常强大。但是个人不喜欢js的过于

灵活（弱类型）

的语法。强大的强类型语言

Typescript(简称TS)

是我的首选，他可以编译成

JavaScript

，编译成的JavaScript代码可读性很好，但是这不是关键，关键是

TS

开发和调试效率极高。

但是

React Native

官方是使用

js

的开发的,如果如果使用TS开发React Native的关键是

transformer

。

eact-native结合的关键是使用转换器

初始化项目

react-native init YahuiApp

cd YahuiApp

yarn add --dev react-native-typescript-transformer typescript @types/react @types/react-native

用vscode打开 添加配置文件

配置Typescript

新建文件

tsconfig.json

内容为

{
"compilerOptions": {
"module": "es2015",
"target": "es2015",
"moduleResolution": "node",
"jsx": "react-native",
"noImplicitAny": true,
"experimentalDecorators": true,
"preserveConstEnums": true,
"sourceMap": true,
"watch": true,
"allowSyntheticDefaultImports": true
},
"filesGlob": [
"src/**/*.ts",
"src/**/*.tsx"
],
"exclude": [
"index.android.js",
"index.ios.js",
"build",
"node_modules"
]
}

新建文件

tslint.json

内容为

{
"rules": {
"class-name": false,
"comment-format": [
true,
"check-space"
],
"indent": [
true,
"spaces"
],
"no-duplicate-variable": true,
"no-eval": true,
"no-internal-module": true,
"no-trailing-whitespace": true,
"no-unsafe-finally": true,
"no-var-keyword": true,
"one-line": [
true,
"check-open-brace",
"check-whitespace"
],
"quotemark": [
true,
"double"
],
"semicolon": [
true,
"always"
],
"triple-equals": [
true,
"allow-null-check"
],
"typedef-whitespace": [
true,
{
"call-signature": "nospace",
"index-signature": "nospace",
"parameter": "nospace",
"property-declaration": "nospace",
"variable-declaration": "nospace"
}
],
"variable-name": [
true,
"ban-keywords"
],
"whitespace": [
true,
"check-branch",
"check-decl",
"check-operator",
"check-separator",
"check-type"
]
}
}

配置React Native Packager

根目录新建rn-cli.config.js文件 内容为：

module.exports = {

getTransformModulePath() {

return require.resolve('react-native-typescript-transformer');

},

getSourceExts() {

return [ 'ts', 'tsx' ]

}

};

修改package.json 文件 的scripts start

"scripts": {

"start": "react-native start --transformer node_modules/react-native-typescript-transformer/index.js --sourceExts ts,tsx",

"test": "jest"

},

编写代码

在 src文件夹里新建

main.tsc

文件

代码为：

import React, { Component } from "react";

import {

StyleSheet,

Text,

View

} from "react-native";

interface Props {

}

interface State {

}

export default class App extends Component<Props, State> {
render() {
return (
<View style={styles.container}>
<Text style={styles.text}>
Welcome to React Native!
</Text>
</View>
);
}
}

const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: "center",
alignItems: "center",
backgroundColor: "#F5FCFF",
} as React.ViewStyle,

text: {
fontSize: 20,
textAlign: "center",
margin: 10,
} as React.TextStyle,
});

AppRegistry

import {

AppRegistry,

} from 'react-native';

import App from "./src/main";

AppRegistry.registerComponent('YahuiApp', () => App);

至此 您的使用TS开发React Native的项目环境搭建好了