dev: add plugin for circular dependency detection

Example run: https://gist.github.com/saghul/e5e12edc108bdedbcbe65a3d7528235f

package-lock.json

         "safe-buffer": "^5.0.1"
       }
     },
+    "circular-dependency-plugin": {
+      "version": "5.2.0",
+      "resolved": "https://registry.npmjs.org/circular-dependency-plugin/-/circular-dependency-plugin-5.2.0.tgz",
+      "integrity": "sha512-7p4Kn/gffhQaavNfyDFg7LS5S/UT1JAjyGd4UqR2+jzoYF02eDkj0Ec3+48TsIa4zghjLY87nQHIh/ecK9qLdw==",
+      "dev": true
+    },
     "circular-json": {
       "version": "0.3.3",
       "resolved": "https://registry.npmjs.org/circular-json/-/circular-json-0.3.3.tgz",

package.json

     "@babel/runtime": "7.5.5",
     "babel-eslint": "10.0.1",
     "babel-loader": "8.0.4",
+    "circular-dependency-plugin": "5.2.0",
     "clean-css": "3.4.25",
     "css-loader": "0.28.7",
     "eslint": "5.6.1",

webpack.config.js

 /* global __dirname */
 
+const CircularDependencyPlugin = require('circular-dependency-plugin');
 const process = require('process');
 const { BundleAnalyzerPlugin } = require('webpack-bundle-analyzer');
 
     = process.env.WEBPACK_DEV_SERVER_PROXY_TARGET || 'https://alpha.jitsi.net';
 
 const analyzeBundle = process.argv.indexOf('--analyze-bundle') !== -1;
+const detectCircularDeps = process.argv.indexOf('--detect-circular-deps') !== -1;
 
 const minimize
     = process.argv.indexOf('-p') !== -1
             && new BundleAnalyzerPlugin({
                 analyzerMode: 'disabled',
                 generateStatsFile: true
+            }),
+        detectCircularDeps
+            && new CircularDependencyPlugin({
+                allowAsyncCycles: false,
+                exclude: /node_modules/,
+                failOnError: false
             })
     ].filter(Boolean),
     resolve: {