What should I do if React does not support less files?

Method: 1. Use "npm install less less-loader" to install less; 2. Change "test:/\.css$/" in "module.rules" to "test:/\. (css|less)$/”; 3. Less can be supported after restarting.

The operating environment of this tutorial: Windows 10 system, react17.0.1 version, Dell G3 computer.

What to do if React does not support less files

create-react-app is officially provided by React and recommends the best way to build React single-page applications, but it does not support less by default. You need Manual integration:

1, you must install less

npm install less less-loader

2 manually, expose the webpack configuration file [npm run eject], modify the weppack.config.js file, and add less configuration

Find the loading rules of the css file in the module.rules node:

test: /\.css$/ modified to test: /\.(css|less)$/;

Add an object element {loader: require.resolve('less-loader')} at the end of the use array.

After the modification is completed:

const getStyleLoaders = (cssOptions, preProcessor) => {
    const loaders = [
      isEnvDevelopment && require.resolve('style-loader'),
      isEnvProduction && {
        loader: MiniCssExtractPlugin.loader,
        options: Object.assign(
          {},
          shouldUseRelativeAssetPaths ? { publicPath: '../../' } : undefined
        ),
      },
      {
        loader: require.resolve('css-loader'),
        options: cssOptions,
      },
      {
        // Options for PostCSS as we reference these options twice
        // Adds vendor prefixing based on your specified browser support in
        // package.json
        loader: require.resolve('postcss-loader'),
        options: {
          // Necessary for external CSS imports to work
          // https://github.com/facebook/create-react-app/issues/2677
          ident: 'postcss',
          plugins: () => [
            require('postcss-flexbugs-fixes'),
            require('postcss-preset-env')({
              autoprefixer: {
                flexbox: 'no-2009',
              },
              stage: 3,
            }),
          ],
          sourceMap: isEnvProduction ? shouldUseSourceMap : isEnvDevelopment,
        },        
      },
      {
        loader: require.resolve('less-loader') // compiles Less to CSS
      }
    ].filter(Boolean);
    if (preProcessor) {
      loaders.push({
        loader: require.resolve(preProcessor),
        options: {
          sourceMap: isEnvProduction ? shouldUseSourceMap : isEnvDevelopment,
        },
      });
    }
    return loaders;
  };

You need to restart the project to see that the less style is available.

Recommended learning: "react video tutorial"

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