Merge pull request #655 from ckeditor/i/7396

Internal: Replaced `istanbul` with `nyc`. Closes ckeditor/ckeditor5#7396.

.gitignore

@@ -3,5 +3,6 @@
 # Be sure to append /** to folders to have everything inside them ignored.
 
 **/node_modules/**
+.nyc_output/**
 coverage/**
 npm-debug.log

package.json

@@ -10,9 +10,9 @@
     "eslint": "^7.0.0",
     "eslint-config-ckeditor5": "^3.0.0",
     "husky": "^4.2.5",
-    "istanbul": "^0.4.5",
     "lint-staged": "^10.2.4",
-    "mocha": "^7.1.2"
+    "mocha": "^7.1.2",
+    "nyc": "^15.1.0"
   },
   "engines": {
     "node": ">=12.0.0",
@@ -28,7 +28,7 @@
   "homepage": "https://github.com/ckeditor/ckeditor5-dev#readme",
   "scripts": {
     "test": "mocha packages/*/tests --recursive --timeout 5000",
-    "coverage": "istanbul cover _mocha packages/*/tests -- --recursive --timeout 5000",
+    "coverage": "nyc --reporter=lcov --reporter=text-summary mocha packages/*/tests -- --recursive --timeout 5000",
     "changelog": "node ./scripts/changelog.js",
     "release:bump-version": "node ./scripts/bump-versions.js",
     "release:publish": "node ./scripts/publish.js",