React使用less

Tags: React, 踩坑
日期: 2021/01/22

使用create-react-app脚手架搭建的react项目，会自带css和sass，但是没有less,如果在项目中需要使用less，需要进行下载并进行一些配置。

首先需要暴露Webpack配置文件,使用命令npm run eject命令释放,找到webpack.config.js文件

搜索Sass找到如下代码

// style files regexes
const cssRegex = /\.css$/;
const cssModuleRegex = /\.module\.css$/;
const sassRegex = /\.(scss|sass)$/;
const sassModuleRegex = /\.module\.(scss|sass)$/;

在下面添加

// 添加 less 解析规则
const lessRegex = /\.less$/;
const lessModuleRegex = /\.module\.less$/;

然后找到如下配置

// Adds support for CSS Modules (https://github.com/css-modules/css-modules)
// using the extension .module.css
{
    test: cssModuleRegex,
    use: getStyleLoaders({
        importLoaders: 1,
        sourceMap: isEnvProduction
            ? shouldUseSourceMap
            : isEnvDevelopment,
        modules: {
            getLocalIdent: getCSSModuleLocalIdent,
        },
    }),
},
// Opt-in support for SASS (using .scss or .sass extensions).
// By default we support SASS Modules with the
// extensions .module.scss or .module.sass
{
    test: sassRegex,
    exclude: sassModuleRegex,
    use: getStyleLoaders(
        {
            importLoaders: 3,
            sourceMap: isEnvProduction
                ? shouldUseSourceMap
                : isEnvDevelopment,
        },
        'sass-loader'
    ),
    // Don't consider CSS imports dead code even if the
    // containing package claims to have no side effects.
    // Remove this when webpack adds a warning or an error for this.
    // See https://github.com/webpack/webpack/issues/6571
    sideEffects: true,
},
// Adds support for CSS Modules, but using SASS
// using the extension .module.scss or .module.sass
{
    test: sassModuleRegex,
    use: getStyleLoaders(
        {
            importLoaders: 3,
            sourceMap: isEnvProduction
                ? shouldUseSourceMap
                : isEnvDevelopment,
            modules: {
                getLocalIdent: getCSSModuleLocalIdent,
            },
        },
        'sass-loader'
    ),
},

直接把Sass的配置复制到下面,关键字替换为Less

//less配置    可以直接复制上面的sass配置之后改成less就行
{
    test: lessRegex,
    exclude: lessModuleRegex,
    use: getStyleLoaders(
        {
            importLoaders: 3,
            sourceMap: isEnvProduction
                ? shouldUseSourceMap
                : isEnvDevelopment,
        },
        'less-loader'
    ),
    // Don't consider CSS imports dead code even if the
    // containing package claims to have no side effects.
    // Remove this when webpack adds a warning or an error for this.
    // See https://github.com/webpack/webpack/issues/6571
    sideEffects: true,
},
{
    test: lessModuleRegex,
    use: getStyleLoaders(
        {
            importLoaders: 3,
            sourceMap: isEnvProduction
                ? shouldUseSourceMap
                : isEnvDevelopment,
            modules: {
                getLocalIdent: getCSSModuleLocalIdent,
            },
        },
        'less-loader'
    ),
},

保存即可

然后使用命令

yarn add less less-loader --save

最后把项目中的css文件改名为less,重启项目即可