eslint and stuff for tests

.eslintrc.yml

@@ -0,0 +1,8 @@
+env:
+  browser: true
+  es2021: true
+extends: 'eslint:recommended'
+parserOptions:
+  ecmaVersion: 12
+  sourceType: module
+rules: {}

package.json

@@ -1 +1,7 @@
-{}
+{
+  "devDependencies": {
+    "eslint": "^7.32.0",
+    "service-worker-mock": "^2.0.5"
+  },
+  "dependencies": {}
+}