fix: remove purgecss (#440)

PurgeCSS doesn’t work with the latest version of PostCSS, far as I can tell.  It ends up removing too many classes.  It has always been sort of problematic and we only use it in a few MFEs, so I think it’s time for it to go.

README.rst

@@ -49,13 +49,6 @@ This MFE is configured via node environment variables supplied at build time. Se
 For more information see the document: `Micro-frontend applications in Open
 edX <https://edx.readthedocs.io/projects/edx-developer-docs/en/latest/micro-frontends-in-open-edx.html>`__.
 
-----------
-
-Notes
------
-
-The production Webpack configuration for this repo uses `Purgecss <https://www.purgecss.com/>`__ to remove unused CSS from the production css file. In ``webpack.prod.config.js`` the Purgecss plugin is configured to scan directories to determine what css selectors should remain. Currently the src/ directory is scanned along with all ``@edx/frontend-component*`` node modules and ``@edx/paragon``. **If you add and use a component in this repo that relies on HTML classes or ids for styling you must add it to the Purgecss configuration or it will be unstyled in the production build.**
-
 .. |Build Status| image:: https://api.travis-ci.org/edx/frontend-app-profile.svg?branch=master
    :target: https://travis-ci.org/edx/frontend-app-profile
 .. |Codecov| image:: https://img.shields.io/codecov/c/github/edx/frontend-app-profile

package-lock.json

@@ -1857,9 +1857,9 @@
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     },
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-      "resolved": "https://registry.npmjs.org/@edx/frontend-build/-/frontend-build-7.0.0.tgz",
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+      "version": "7.0.3",
+      "resolved": "https://registry.npmjs.org/@edx/frontend-build/-/frontend-build-7.0.3.tgz",
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@@ -1891,14 +1891,14 @@
         "eslint-plugin-react-hooks": "1.7.0",
         "file-loader": "6.2.0",
         "html-webpack-new-relic-plugin": "4.1.0",
-        "html-webpack-plugin": "5.3.1",
+        "html-webpack-plugin": "5.3.2",
         "identity-obj-proxy": "3.0.0",
         "image-webpack-loader": "7.0.1",
         "jest": "26.4.2",
-        "mini-css-extract-plugin": "1.6.0",
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         "new-relic-source-map-webpack-plugin": "1.2.0",
         "postcss": "8.3.5",
-        "postcss-loader": "6.1.0",
+        "postcss-loader": "6.1.1",
         "postcss-rtlcss": "3.3.4",
         "react-dev-utils": "11.0.4",
         "resolve-url-loader": "5.0.0-beta.1",
@@ -1912,25 +1912,6 @@
         "webpack-cli": "4.5.0",
         "webpack-dev-server": "4.0.0-beta.3",
         "webpack-merge": "5.2.0"
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       }
     },
     "@edx/frontend-component-footer": {
@@ -2043,9 +2024,9 @@
       }
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+      "version": "16.1.0",
+      "resolved": "https://registry.npmjs.org/@edx/paragon/-/paragon-16.1.0.tgz",
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@@ -2284,26 +2265,11 @@
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@@ -2395,12 +2361,6 @@
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@@ -2441,15 +2401,6 @@
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@@ -2699,12 +2635,6 @@
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@@ -2942,9 +2848,9 @@
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@@ -3491,9 +3397,9 @@
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@@ -4031,9 +3937,9 @@
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@@ -6743,23 +6634,6 @@
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@@ -8984,9 +8858,9 @@
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-        "lodash": "^4.17.20",
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+        "lodash": "^4.17.21",
+        "pretty-error": "^3.0.4",
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+      },
+      "dependencies": {
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@@ -19065,6 +18581,23 @@
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+          "dev": true
+        }
+      }
+    },
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+      "resolved": "https://registry.npmjs.org/ws/-/ws-7.5.3.tgz",
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+      "resolved": "https://registry.npmjs.org/y18n/-/y18n-4.0.3.tgz",
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package.json

@@ -44,7 +44,7 @@
     "@edx/frontend-component-footer": "10.1.5",
     "@edx/frontend-component-header": "2.3.0",
     "@edx/frontend-platform": "1.11.0",
-    "@edx/paragon": "16.0.1",
+    "@edx/paragon": "16.1.0",
     "@fortawesome/fontawesome-svg-core": "1.2.25",
     "@fortawesome/free-brands-svg-icons": "5.7.2",
     "@fortawesome/free-regular-svg-icons": "5.7.2",
@@ -81,14 +81,13 @@
   "devDependencies": {
     "@commitlint/cli": "12.1.4",
     "@commitlint/config-angular": "12.1.4",
-    "@edx/frontend-build": "7.0.0",
+    "@edx/frontend-build": "7.0.3",
     "codecov": "3.8.2",
     "enzyme": "3.11.0",
     "enzyme-adapter-react-16": "1.15.6",
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     "redux-mock-store": "1.5.4"

webpack.prod.config.js

@@ -1,21 +0,0 @@
-const glob = require('glob');
-const PurgecssPlugin = require('purgecss-webpack-plugin');
-const { createConfig } = require('@edx/frontend-build');
-
-module.exports = createConfig('webpack-prod', {
-  plugins: [
-    // Scan files for class names and ids and remove unused css
-    new PurgecssPlugin({
-      paths: [].concat(
-        // Scan files in this app
-        glob.sync('src/**/*', { nodir: true }),
-        // Scan files in any edx frontend-component
-        glob.sync('node_modules/@edx/frontend-component*/**/*', { nodir: true }),
-        // Scan files in paragon
-        glob.sync('node_modules/@edx/paragon/**/*', { nodir: true }),
-      ),
-      // Protect react-css-transition class names
-      safelist: [/-enter/, /-appear/, /-exit/],
-    }),
-  ],
-});