🔧 config(cover): Fix coverage report generation.

Author: make-github-pseudonymous-again

package.json

@@ -42,7 +42,7 @@
     "build-gh-pages": "npm run build-docs",
     "ci:test": "npm run lint-config && npm run lint && npm run cover",
     "commit-msg": "commitlint --edit",
-    "cover": "c8 --all --src src --reporter=lcov npm test",
+    "cover": "NODE_ENV=cover c8 --all --src src --reporter=lcov npm test",
     "debug": "NODE_ENV=debug npm run test -- -st --fail-fast",
     "dev": "npm run lint-config-and-fix && npm run lint-and-fix && npm run cover -- -- -st --fail-fast",
     "install-hooks": "husky install",
@@ -146,6 +146,29 @@
           ]
         ]
       },
+      "cover": {
+        "sourceMaps": "inline",
+        "presets": [
+          [
+            "@babel/preset-env",
+            {
+              "targets": "current node"
+            }
+          ]
+        ],
+        "plugins": [
+          [
+            "transform-remove-console",
+            {
+              "exclude": [
+                "log",
+                "error",
+                "warn"
+              ]
+            }
+          ]
+        ]
+      },
       "development": {
         "presets": [
           "babel-preset-power-assert"