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

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关于React Native的详细介绍我就不叙述了，他是使用js构建原生app的开发框架。一次编码多平台运行，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

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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

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{
    "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

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{
    "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：

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    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：

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    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

最终代码在：https://github.com/YahuiWong/react-native-typescript 如果觉得有用，请Star

转载请注明出处：https://blog.yahui.wang/2017/08/26/react-native-typescript-init-debug/