Move ESLint config to own file

Author: koddsson

.eslintrc.json

@@ -0,0 +1,11 @@
+{
+  "root": true,
+  "extends": ["plugin:github/browser", "plugin:github/recommended", "plugin:github/typescript"],
+  "overrides": [
+    {
+      "files": "*.js",
+      "parser": "espree",
+      "parserOptions": {"ecmaVersion": 8}
+    }
+  ]
+}

package.json

@@ -41,12 +41,5 @@
     "rollup": "^2.46.0",
     "rollup-plugin-typescript2": "^0.30.0",
     "typescript": "^4.2.4"
-  },
-  "eslintConfig": {
-    "extends": [
-      "plugin:github/browser",
-      "plugin:github/recommended",
-      "plugin:github/typescript"
-    ]
   }
 }