feat(eslint): add linter configuration

.eslintignore

@@ -0,0 +1,9 @@
+# Ignore artifacts:
+dist
+
+lib
+npm-debug.log
+bower_components
+node_modules
+yarn-error.log
+yarn.lock

.eslintrc.json

@@ -0,0 +1,18 @@
+{
+  "env": {
+    "browser": true,
+    "es2021": true,
+    "mocha": true
+  },
+  "extends": ["airbnb-base", "plugin:prettier/recommended"],
+  "parserOptions": {
+    "ecmaVersion": 12,
+    "sourceType": "module"
+  },
+  "plugins": ["prettier"],
+  "rules": {
+    "prettier/prettier": "error",
+    "prefer-const": "off",
+    "camelcase": "off"
+  }
+}