前言
webpack4正式版发布也有一段时间了, 为了从实际中感受变化, 于是以typescript, react, 结合之前翻译的一篇文章webpack-4.0更新日志(翻译), 搭建一个可供项目使用的框架.
项目状况
github
项目已使用
- webpack-4
- typescript
- react
- react-router-4
- component hot reload
- async component
- import .(s)css auto generate .(s)css.d.ts
- svg icon
- Mobx
- Antd
主要库及版本
- webpack --------- 4.1.1
- typescript --------- 2.9.2
- react ------------ 16.3.2
- react-router-dom -- 4.2.2
- react-hot-loader --- 4.2.0
- ......
- node ------------- 8.11.2
原配置:
// tsconfig.json
{
"compilerOptions": {
"target": "es5",
"module": "es2015",
"moduleResolution": "node",
....
}
}
// webpack.config.js
{
test: /\.(ts(x?)|js(x?))$/,
exclude: /node_modules/,
rules: [
{
loader: 'react-hot-loader/webpack',
},
{
loader: 'ts-loader',
options: {
transpileOnly: true
}
}
}
Module not found: Error: Can't resolve 'react-hot-loader/webpack' in '/Users/jackple/Documents/react/ts-react-webpack4'
果然跑不通, 符合心理预期!????
查看node_modules里面的react-hot-loader, 对比原项目node_modules的react-hot-loader, 文件结构改了不少, 看4.0.0的源码, 也不再有webpack目录, 而且代码中有这么一段:
throw new Error('React Hot Loader: You are erroneously trying to use a Babel plugin ' + 'as a Webpack loader. We recommend that you use Babel, ' + 'remove "react-hot-loader/babel" from the "loaders" section ' + 'of your Webpack configuration, and instead add ' + '"react-hot-loader/babel" to the "plugins" section of your .babelrc file. ' + 'If you prefer not to use Babel, replace "react-hot-loader/babel" with ' + '"react-hot-loader/webpack" in the "loaders" section of your Webpack configuration. ');
提示信息与实际不符, 估计提示没改过来, 还是用babel吧(其实它的README也是建议用babel), 免得挣扎!
按照react-hot-loader官方推荐做法以及demo
When using TypeScript, Babel is not required, but React Hot Loader will not work without it. Just add babel-loader into your Webpack configuration, with React Hot Loader plugin.
{
test: /\.tsx?$/,
use: [
{
loader: 'babel-loader',
options: {
babelrc: true,
plugins: ['react-hot-loader/babel'],
},
},
'ts-loader', // (or awesome-typescript-loader)
],
}
You also have to modify your tsconfig.json:
// tsconfig.json
{
"module": "commonjs",
"target": "es6"
}
// xxx.tsx
import { hot } from 'react-hot-loader'
...
export default hot(module)(Component)
- 首先是react-hot-loader/babel, 无论是按官方推荐配置, 还是写在.babelrc, 以上两者都加上环境判断, 开发环境没问题, 可是打包出来的生产环境代码看起来怪怪的:
...
default = i, u = r(4).
default, s = r(4).leaveModule, u && (u.register(l, "Error", "/Users/jackple/Documents/react/ts-react-webpack4/src/components/Error/index.tsx"), u.register(i, "default", "/Users/jackple/Documents/react/ts-react-webpack4/src/components/Error/index.tsx"), s(e))
}).call(this, r(12)(e))
...
怎么看都不合理呀! 为什么会出来我的本地源文件路径! 本地开nginx调试生产环境代码, 虽然能跑, 不过, 这不是我想要的!
最后, 这部分的处理结果是把react-hot-loader/babel删除之! 再将tsx接受hot reload还原为旧式写法:
import { AppContainer } from 'react-hot-loader'
import AppRouter from './router'
const render = Component => {
ReactDOM.render(
<AppContainer>
<Component />
</AppContainer>,
document.getElementById('app') as HTMLElement
)
}
render(AppRouter)
// Hot Module Replacement API
if (module.hot) {
module.hot.accept(['router'], () => {
import('./router').then(mod => render(mod.default))
})
}
- 再者是为配合webpack4的代码分割(dynamic import), 需要把tsconfig.json中的module置为esnext(主要是为了让typescript不编译import), 不知道是不是我配置失误, 显示以下错误:
ERROR in ./src/index.tsx
Module build failed: SyntaxError: 'import' and 'export' may only appear at the top level (14:8)
12 | if (module.hot) {
13 | module.hot.accept(['router'], () => {
> 14 | import('./router').then(mod => render(mod.default));
| ^
15 | });
16 | }
不是说好的支持import语法了咩? 最后还是要加上syntax-dynamic-import的babel插件
bootstrap:74 Uncaught (in promise) TypeError: Cannot read property 'call' of undefined
at i (bootstrap:74)
at Object.31 (index.css:1)
at i (bootstrap:74)
at Object.32 (index.css?f62f:2)
at i (bootstrap:74)
at Object.52 (index.tsx:3)
at i (bootstrap:74)
at index.tsx:9
at <anonymous>
过程曲折, 还有一些问题没写上, 具体请参考项目...
如果大家有更好的解决方案, 也欢迎评论或提issue
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