我正在尝试从CSS模块导入主题,但是TypeScript给我一个“找不到模块”错误,并且该主题未在运行时应用。我认为我的Webpack配置有问题,但是我不确定问题出在哪里。
我正在使用以下工具:
"typescript": "^2.0.3"
"webpack": "2.1.0-beta.25"
"webpack-dev-server": "^2.1.0-beta.9"
"react": "^15.4.0-rc.4"
"react-toolbox": "^1.2.3"
"node-sass": "^3.10.1"
"style-loader": "^0.13.1"
"css-loader": "^0.25.0"
"sass-loader": "^4.0.2"
"sass-lint": "^1.9.1"
"sasslint-webpack-plugin": "^1.0.4"
这里是我的webpack.config.js
var path = require('path');
var webpack = require('webpack');
var sassLintPlugin = require('sasslint-webpack-plugin');
module.exports = {
entry: [
'webpack-dev-server/client?http://localhost:8080',
'webpack/hot/dev-server',
'./src/index.tsx',
],
output: {
path: path.resolve(__dirname, 'dist'),
publicPath: 'http://localhost:8080/',
filename: 'dist/bundle.js',
},
devtool: 'source-map',
resolve: {
extensions: ['.webpack.js', '.web.js', '.ts', '.tsx', '.js'],
},
module: {
rules: [{
test: /\.js$/,
loader: 'source-map-loader',
exclude: /node_modules/,
enforce: 'pre',
}, {
test: /\.tsx?$/,
loader: 'tslint-loader',
exclude: /node_modules/,
enforce: 'pre',
}, {
test: /\.tsx?$/,
loaders: [
'react-hot-loader/webpack',
'awesome-typescript-loader',
],
exclude: /node_modules/,
}, {
test: /\.scss$/,
loaders: ['style', 'css', 'sass']
}, {
test: /\.css$/,
loaders: ['style', 'css']
}],
},
externals: {
'react': 'React',
'react-dom': 'ReactDOM'
},
plugins: [
new sassLintPlugin({
glob: 'src/**/*.s?(a|c)ss',
ignoreFiles: ['src/normalize.scss'],
failOnWarning: false, // Do it.
}),
new webpack.HotModuleReplacementPlugin(),
],
devServer: {
contentBase: './'
},
};
和我要导入的App.tsx
:
import * as React from 'react';
import { AppBar } from 'react-toolbox';
import appBarTheme from 'react-toolbox/components/app_bar/theme.scss'
// local ./theme.scss stylesheets aren't found either
interface IAppStateProps {
// No props yet
}
interface IAppDispatchProps {
// No state yet
}
class App extends React.Component<IAppStateProps & IAppDispatchProps, any> {
constructor(props: IAppStateProps & IAppDispatchProps) {
super(props);
}
public render() {
return (
<div className='wrapper'>
<AppBar title='My App Bar' theme={appBarTheme}>
</AppBar>
</div>
);
}
}
export default App;
启用类型安全样式表模块导入还需要什么?
TypeScript不知道.ts
或.tsx
以外的文件,因此,如果导入的文件后缀未知,则会抛出错误。
如果您有一个webpack配置允许您导入其他类型的文件,则必须告诉TypeScript编译器这些文件存在。为此,添加一个声明文件,在其中声明具有合适名称的模块。
要声明的模块的内容取决于用于文件类型的webpack加载器。在通过[[sass-loader→css-loader→style-loader通过管道传输*.scss
文件的Webpack配置中,导入的模块中将没有内容,并且正确的模块声明看起来像这样:
// declaration.d.ts
declare module '*.scss';
如果为css-modules配置了装载程序,只需像这样扩展声明:
// declaration.d.ts declare module '*.scss' { const content: {[className: string]: string}; export default content; }
这里是一个对我有用的完整配置(我只是花了一个小时痛苦的反复试验,以防有人遇到相同的问题:]
TypeScript + WebPack + Sass
webpack.config.js
module.exports = {
//mode: "production",
mode: "development", devtool: "inline-source-map",
entry: [ "./src/app.tsx"/*main*/ ],
output: {
filename: "./bundle.js" // in /dist
},
resolve: {
// Add `.ts` and `.tsx` as a resolvable extension.
extensions: [".ts", ".tsx", ".js", ".css", ".scss"]
},
module: {
rules: [
{ test: /\.tsx?$/, loader: "ts-loader" },
{ test: /\.scss$/, use: [
{ loader: "style-loader" }, // to inject the result into the DOM as a style block
{ loader: "css-modules-typescript-loader"}, // to generate a .d.ts module next to the .scss file (also requires a declaration.d.ts with "declare modules '*.scss';" in it to tell TypeScript that "import styles from './styles.scss';" means to load the module "./styles.scss.d.td")
{ loader: "css-loader", options: { modules: true } }, // to convert the resulting CSS to Javascript to be bundled (modules:true to rename CSS classes in output to cryptic identifiers, except if wrapped in a :global(...) pseudo class)
{ loader: "sass-loader" }, // to convert SASS to CSS
// NOTE: The first build after adding/removing/renaming CSS classes fails, since the newly generated .d.ts typescript module is picked up only later
] },
]
}
};
也将declarations.d.ts
放在您的项目中:
// We need to tell TypeScript that when we write "import styles from './styles.scss' we mean to load a module (to look for a './styles.scss.d.ts'). declare module '*.scss';
并且您将在package.json
的dev-dependencies中需要所有这些:
"devDependencies": { "@types/node-sass": "^4.11.0", "node-sass": "^4.12.0", "css-loader": "^1.0.0", "css-modules-typescript-loader": "^2.0.1", "sass-loader": "^7.1.0", "style-loader": "^0.23.1", "ts-loader": "^5.3.3", "typescript": "^3.4.4", "webpack": "^4.30.0", "webpack-cli": "^3.3.0" }
然后您会在mystyle.d.ts
旁边获得一个mystyle.scss
,其中包含您定义的CSS类,您可以将其作为Typescript模块导入并像这样使用:
import * as styles from './mystyles.scss'; const foo = <div className={styles.myClass}>FOO</div>;
CSS将自动加载(作为,因为导入的mystyles.d.ts是旧版本,而不是编译期间刚刚生成的新版本。只是再次编译。 享受。style
元素注入到DOM中),并包含隐秘标识符而不是.scss中的CSS类,以隔离页面中的样式(除非您使用:global(.a-global-class) { ... }
)。请注意,只要添加CSS类或删除它们或重命名它们,
第一次编译就会失败
如果您碰巧使用类似这样的路径tsconfig:
{
"compilerOptions": {
"paths": {
"style/*": [ "src/style/*" ],
}
}
}
因此您可以这样做:
import { header } from 'style/ui.scss';
然后您还需要像这样在Webpack上添加modules resolve配置:
module.exports = { ... resolve: { ... alias: { style: path.resolve(__dirname, 'src', 'style') } } }
请确保根据您的设置设置了路径。这使webpack知道要看哪里,因为它认为新的导入路径实际上是一个模块,因此它默认为node_modules目录。使用此配置,它知道在哪里寻找并找到它,并且构建成功。