TypeScript学习笔记（三）Webpack

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照着教程配完报了个奇怪的错误，哪位大神帮忙看一下

1.创建项目：

mkdir projcd proj

mkdir src

mkdir dist

mkdir components

2.初始化程序：

npm init

3.安装依赖ts-loader和source-map-loader。

npm install -g typescript webpack

npm install --save react react-dom @types/react @types/react-dom

4. 安裝

npm install --save-dev ts-loader source-map-loadernpm link typescript

5.在根目录下添加tsconfig.json文件

{"compilerOptions": {"outDir": "./dist/","sourceMap": true,"noImplicitAny": true,"module": "commonjs","target": "es5","jsx": "react"},"files": ["./src/components/Hello.tsx","./src/index.tsx"]}

6.写代码，在src/components目录下创建名为Hello.tsx的文件

import * as React from "react";export interface HelloProps { compiler: string; framework: string; }export class Hello extends React.Component<HelloProps, {}> {render() {return <h1>Hello from {this.props.compiler} and {this.props.framework}!</h1>;}}

7.在src下创建index.tsx文件

import * as React from "react";import * as ReactDOM from "react-dom";import { Hello } from "./components/Hello";ReactDOM.render(<Hello compiler="TypeScript" framework="React" />,document.getElementById("example"));

8.在proj根目录创建index.html

<!DOCTYPE html><html><head><meta charset="UTF-8" /><title>Hello React!</title></head><body><div id="example"></div><!-- Dependencies --><script src="./node_modules/react/dist/react.js"></script><script src="./node_modules/react-dom/dist/react-dom.js"></script><!-- Main --><script src="./dist/bundle.js"></script></body></html>

9.创建webpack配置文件

1）在工程根目录创建webpack.config.js

module.exports = {entry: "./src/index.tsx",output: {filename: "bundle.js",path: __dirname + "/dist"},// Enable sourcemaps for debugging webpack's output.devtool: "source-map",resolve: {// Add '.ts' and '.tsx' as resolvable extensions.extensions: ["", ".webpack.js", ".web.js", ".ts", ".tsx", ".js"]},module: {loaders: [// All files with a '.ts' or '.tsx' extension will be handled by 'ts-loader'.{test: /\.tsx?$/,loader: "ts-loader"}],preLoaders: [// All output '.js' files will have any sourcemaps re-processed by 'source-map-loader'.{test: /\.js$/,loader: "source-map-loader"}]},// When importing a module whose path matches one of the following, just// assume a corresponding global variable exists and use that instead.// This is important because it allows us to avoid bundling all of our// dependencies, which allows browsers to cache those libraries between builds.externals: {"react": "React","react-dom": "ReactDOM"},};

2）执行webpack

3）在浏览器打开index.html

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