Use different postcss plugins for tailwind

Author: iansu

packages/react-scripts/config/webpack.config.js

@@ -140,23 +140,37 @@ module.exports = function (webpackEnv) {
             // Necessary for external CSS imports to work
             // https://github.com/facebook/create-react-app/issues/2677
             ident: 'postcss',
-            plugins: [
-              'postcss-flexbugs-fixes',
-              [
-                'postcss-preset-env',
-                {
-                  autoprefixer: {
-                    flexbox: 'no-2009',
-                  },
-                  stage: 3,
-                },
-              ],
-              // Adds PostCSS Normalize as the reset css with default options,
-              // so that it honors browserslist config in package.json
-              // which in turn let's users customize the target behavior as per their needs.
-              'postcss-normalize',
-              useTailwind && require('tailwindcss'),
-            ],
+            config: false,
+            plugins: !useTailwind
+              ? [
+                  'postcss-flexbugs-fixes',
+                  [
+                    'postcss-preset-env',
+                    {
+                      autoprefixer: {
+                        flexbox: 'no-2009',
+                      },
+                      stage: 3,
+                    },
+                  ],
+                  // Adds PostCSS Normalize as the reset css with default options,
+                  // so that it honors browserslist config in package.json
+                  // which in turn let's users customize the target behavior as per their needs.
+                  'postcss-normalize',
+                ]
+              : [
+                  'tailwindcss',
+                  'postcss-flexbugs-fixes',
+                  [
+                    'postcss-preset-env',
+                    {
+                      autoprefixer: {
+                        flexbox: 'no-2009',
+                      },
+                      stage: 3,
+                    },
+                  ],
+                ],
           },
           sourceMap: isEnvProduction ? shouldUseSourceMap : isEnvDevelopment,
         },