chore: Update Istanbul to NYC

.github/workflows/coverage.yml

@@ -3,13 +3,15 @@ name: Coverage
 on:
   push:
     paths:
+      - ".nycrc.json"
       - "**/*.js"
       - "test/**"
       - "package.json"
       - "bin/node-sass"
       - ".github/workflows/coverage.yml"
   pull_request:
     paths:
+      - ".nycrc.json"
       - "**/*.js"
       - "test/**"
       - "package.json"

.gitignore

@@ -11,4 +11,5 @@ test/lcov.info
 test/fixtures/watching-css-out-01
 test/fixtures/watching-css-out-02
 coverage
-package-lock.json
+package-lock.json
+.nyc_output

.nycrc.json

@@ -0,0 +1,14 @@
+{
+  "all": true,
+  "include": [
+    "bin/*",
+    "lib/*.js",
+    "scripts/**/*.js"
+  ],
+  "extension": [
+    "node-sass"
+  ],
+  "reporter": [
+    "lcovonly"
+  ]
+}

package.json

@@ -27,11 +27,11 @@
   },
   "gypfile": true,
   "scripts": {
-    "coverage": "node scripts/coverage.js",
+    "coverage": "nyc npm run test",
     "install": "node scripts/install.js",
     "postinstall": "node scripts/build.js",
     "lint": "eslint bin/node-sass lib scripts test",
-    "test": "node_modules/.bin/mocha test/{*,**/**}.js",
+    "test": "mocha test/{*,**/**}.js",
     "build": "node scripts/build.js --force",
     "prepublish": "not-in-install && node scripts/prepublish.js || in-install"
   },
@@ -72,12 +72,10 @@
     "true-case-path": "^1.0.2"
   },
   "devDependencies": {
-    "coveralls": "^3.0.2",
     "eslint": "^7.10.0",
     "fs-extra": "^0.30.0",
-    "istanbul": "^0.4.2",
     "mocha": "^8.1.3",
-    "mocha-lcov-reporter": "^1.2.0",
+    "nyc": "^15.1.0",
     "rimraf": "^2.5.2",
     "unique-temp-dir": "^1.0.0"
   }