1

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。我在构建期间收到以下错误。如果我删除index.less的第一行,错误就会消失:

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

但是,那我就不会得到 antd 的样式了。(如果我删除也没有错误postcss-loader)。如何解决这个问题?

最小存储库


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:less-loader: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;
}

包.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"
    ]
}
4

2 回答 2

1

看起来您编译的 CSS 包含filter: alpha(opacity=45);postcss-env-function喜欢的内容。

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

理想情况下,在您的情况下,您ignoreUnknownWords可以选择postcss-values-parser忽略该filter: alpha声明,但postcss-env-function不允许您这样做。

因此,一个可能的解决方案可能是进行修改postcss-env-function,以便您可以将ignoreUnknownWords选项传递给解析器。

另一种可能的解决方案是filter: alpha(opacity=#)从您的 CSS 中删除所有声明,因为只有 IE8 及以下版本支持它。例如,您可以通过创建一个简单的函数“plugin”来执行此操作,该函数遍历所有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' } } } },
    ],
  }
} },
于 2021-07-15T15:14:57.200 回答
0

似乎这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%"
}

我不完全确定我主要使用 sass、scss 和 css 的效果如何,但是,我相信你的问题在于将你的不透明度声明为{opacity=45}而不是{opacity:45}. 发布您的样式代码以查看语法错误会很有帮助,但我会开始寻找那里。

于 2021-07-12T14:19:18.737 回答