Drop Node.js 8 (#4500)

* Drop Node.js 8

* Remove engine field

* Fix ESLint configuration

.github/workflows/nodejs.yml

@@ -47,7 +47,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [8, 10, 12]
+        node-version: [10, 12]
         os: [ubuntu-latest, windows-latest, macos-latest]
         exclude:
           - os: ubuntu-latest

docs/developer-guide/prerequisites.md

@@ -2,7 +2,7 @@
 
 ## Technical
 
--   Minimum [Node.js](https://nodejs.org/en/) v8.7.0+, though we do recommend using the latest 8.x, 10.x, or 11.x Node.js releases.
+-   Minimum [Node.js](https://nodejs.org/en/) v10, though we do recommend using the latest LTS release.
 -   Latest [npm](https://www.npmjs.com/).
 
 ## Rules of thumb

package.json

@@ -39,9 +39,6 @@
     "!**/__tests__",
     "!lib/testUtils"
   ],
-  "engines": {
-    "node": ">=8.7.0"
-  },
   "dependencies": {
     "autoprefixer": "^9.7.2",
     "balanced-match": "^1.0.0",
@@ -188,7 +185,16 @@
       "prefer-regex-literals": "error",
       "prefer-rest-params": "error",
       "prefer-spread": "error",
-      "prefer-template": "error"
+      "prefer-template": "error",
+      "node/no-unsupported-features/es-builtins": ["error", {
+        "version": ">=10.18.0"
+      }],
+      "node/no-unsupported-features/es-syntax": ["error", {
+        "version": ">=10.18.0"
+      }],
+      "node/no-unsupported-features/node-builtins": ["error", {
+        "version": ">=10.18.0"
+      }]
     }
   },
   "jest": {