协调 antd 导入与 postcss

Reconciling antd import with postcss

我正在尝试使用 postcss-env-function 以便能够在 javascript 和 less/css 之间共享变量。我在构建过程中收到以下错误。如果我删除 index.less:

的第一行,错误就会消失

@import '~antd/dist/antd.less';

不过,那我就拿不到antd的styles了。 (如果我删除 postcss-loader 也没有错误)。如何解决这个问题?

Minimal repository


错误:

ERROR in ./src/styles/index.less (./node_modules/css-loader/dist/cjs.js??ruleSet[1].rules[1].use[1]!./node_modules/postcss-loader/dist/cjs.js??ruleSet[1].rules[1].use[2]!./node_modules/less-loader/dist/cjs.js??ruleSet[1].rules[1].use[3]!./src/styles/index.less)
Module build failed (from ./node_modules/postcss-loader/dist/cjs.js):
SyntaxError

(1:1) postcss-env-fn: <css input> Unknown word

> 1 | opacity=45

webpack.config.js:

const HtmlWebpackPlugin = require('html-webpack-plugin');
const { CleanWebpackPlugin } = require('clean-webpack-plugin');
const CopyPlugin = require('copy-webpack-plugin');
const TerserPlugin = require('terser-webpack-plugin');
const path = require('path');
const fs = require('fs');

process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';

function buildConfig(args) {
  var rootConfig = {
    entry: './src/index.tsx',
    output: {
      path: path.resolve(__dirname, 'dist'),
      filename: 'app.[fullhash].js'
    },
    resolve: {
      extensions: ['.ts', '.tsx', '.js', '.json']
    },
    devtool: (args && args.production ? false : 'inline-cheap-source-map'),
    devServer: {
      contentBase: './dist',
      disableHostCheck: true,
      hot: true,
      historyApiFallback: true,
      proxy: {
        '/api': {
          target: `https://${process.env.API_HOST}:8081`,
          secure: false,
        }
      },
      https: {
        key: fs.readFileSync(process.env.SSL_KEY_FILE),
        cert: fs.readFileSync(process.env.SSL_CERT_FILE),
      }
    },
    module: {
      rules: [
        {
          test: /\.(ts|js)x?$/,
          exclude: /node_modules/,
          loader: 'babel-loader',
        },
        {
          test: /\.(c|le)ss$/,
          use: [
            { loader: 'style-loader' },
            { loader: 'css-loader', options: { importLoaders: 1 } },
            { loader: 'postcss-loader', options: {
              postcssOptions: {
                ident: 'postcss',
                plugins: { 'postcss-env-function': { importFrom: { environmentVariables: { '--test': '200px' } } } }
              } } },  
            { loader: 'less-loader', options: { lessOptions: { javascriptEnabled: true } } },
          ]
        },
        {
          test: /\.(png|svg|jpg|gif|woff|woff2|eot|ttf|otf|jpeg)$/,
          use: [
            { loader: 'file-loader' },
          ]
        }
      ],
    },
    plugins: [
      new HtmlWebpackPlugin({
        inject: true,
        template: require('html-webpack-template'),
        devServer: (args && args.production) ? undefined : `https://${process.env.BUBI_API_HOST}:8080`,
        meta: [
          {
            name: 'og:title',
            content: 'frontend-react'
          },
          {
            name: 'og:description',
            content: 'React app'
          },
        ],
        mobile: true,
        lang: 'en-GB',
        title: 'frontend-react',
        scripts: [
        ],
      }),
      new CopyPlugin([
        { from: 'static_assets/', to: '' },
      ]),
    ],
  };

  if (args && args.production) {
    rootConfig = {
      ...rootConfig,
      optimization: {
        minimize: true,
        minimizer: [new TerserPlugin({
          extractComments: 'all',
        })],
        usedExports: true,
      },
    };
  }

  return rootConfig;
}

module.exports = buildConfig;

版本: 更少的装载机:8.1.1 postcss:8.3.5 postcss-loader:6.1.1

index.less的开头:

@import '~antd/dist/antd.less'; 

@shadow: 0px 0px 15px rgba(0,0,0,0.08);
@body-background-color: #f7fafc;

.text {
  font-family: "HelveticaNeue-Light", "Helvetica Neue Light", "Helvetica Neue", Helvetica, Arial, "Lucida Grande", sans-serif;
  font-weight: 300;
}

body {
  background-color: @body-background-color;
  padding: 0; 
  overflow-x: hidden;
}

package.json:

declare module '*.jpg';
declare module '*.jpeg';
declare module '*.png';

.babelrc:

{
    "presets": [
        "@babel/preset-env",
        "@babel/preset-typescript",
        "@babel/preset-react"
    ],
    "plugins": [
        "@babel/plugin-proposal-class-properties"
    ]
}

这似乎是关于您的不透明度的语法错误。最常见的样式使用对象,因此您可以将不透明度声明为:

style = {
   opacity:"45%"
}

我不完全确定 less 的效果如何,因为我主要使用 sass、scss 和 css,但是,我相信您的问题在于将不透明度声明为 {opacity=45} 而不是 {opacity:45}。 post 你的样式代码检查语法错误会很有帮助,但我会从那里开始寻找。

看起来你编译的 CSS 包含 filter: alpha(opacity=45);postcss-env-function 不喜欢。

“未知单词”异常由 postcss-values-parser 抛出(postcss-env-function 使用它来解析 CSS 声明值)。

理想情况下,您可以将 ignoreUnknownWords 选项传递给 postcss-values-parser 以忽略 filter: alpha 声明,但 postcss-env-function 不允许您这样做那。

因此,一个可能的解决方案是修改 postcss-env-function,这样您就可以将 ignoreUnknownWords 选项传递给解析器。

另一种可能的解决方案是从您的 CSS 中删除所有 filter: alpha(opacity=#) 声明,因为只有 IE8 及以下版本支持它。您可以这样做,例如,通过创建一个简单的函数“插件”来遍历所有 filter: 声明并在其值以“alpha”开头时将其删除:

webpack.config.js:

{ loader: 'postcss-loader', options: {
  postcssOptions: {
    ident: 'postcss',
    plugins: [
      root => root.walkDecls('filter', decl => {
        if (decl.value.startsWith('alpha')) decl.remove();
      }),
      { 'postcss-env-function': { importFrom: { environmentVariables: { '--test': '200px' } } } },
    ],
  }
} },