eslint: config cleanup & drop nested configs

.eslintrc.yml

@@ -1,19 +1,16 @@
 extends: standard
 
-env:
-  es6: true
-  node: true
-
-parserOptions:
-  ecmaVersion: 2022
-
 overrides:
   -
     files: [ '*.mjs' ]
-    parserOptions:
-      sourceType: module
     rules:
       no-restricted-globals: [ 2, require, __dirname ]
+  -
+    files: [ 'test/**' ]
+    env: { mocha: true }
+  -
+    files: [ 'lib/**' ]
+    parserOptions: { ecmaVersion: 2015 }
 
 ignorePatterns:
   - demo/

lib/.eslintrc.yml

@@ -1,5 +0,0 @@
-env:
-  node: false
-
-parserOptions:
-  ecmaVersion: 2015

package.json

@@ -27,7 +27,7 @@
     "markdown-it": "bin/markdown-it.mjs"
   },
   "scripts": {
-    "lint": "eslint --ext js --ext mjs .",
+    "lint": "eslint .",
     "test": "npm run lint && CJS_ONLY=1 npm run build && c8 --exclude dist --exclude test -r text -r html -r lcov mocha && node support/specsplit.mjs",
     "doc": "node support/build_doc.mjs",
     "gh-doc": "npm run doc && gh-pages -d apidoc -f",

test/.eslintrc.yml

@@ -1,2 +0,0 @@
-env:
-  mocha: true