Added linter config and updated packages. (#70)

.gitignore

@@ -13,5 +13,3 @@ build/Release
 
 # Dependency directories
 functions/node_modules/
-
-.vscode

.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+    "editor.formatOnSave": true,
+    "editor.defaultFormatter": "dbaeumer.vscode-eslint",
+    "editor.codeActionsOnSave": {
+        "source.fixAll.eslint": true
+    },
+    "eslint.workingDirectories": ["./functions"]
+}

functions/.eslintrc.js

@@ -0,0 +1,27 @@
+module.exports = {
+  env: {
+    node: true,
+    es2022: true,
+  },
+  parserOptions: {
+    ecmaVersion: 2023,
+  },
+  extends: [
+    "eslint:recommended",
+    "airbnb-base",
+  ],
+  rules: {
+    "no-restricted-globals": ["error", "name", "length"],
+    "prefer-arrow-callback": "error",
+    quotes: ["error", "double", { allowTemplateLiterals: true }],
+  },
+  overrides: [
+    {
+      files: ["tests/*.js", "tests/**/*.js"],
+      env: {
+        jest: true,
+      },
+    },
+  ],
+  globals: {},
+};

functions/config.js

@@ -9,5 +9,5 @@ module.exports = {
   mailchimpMergeField: process.env.MAILCHIMP_MERGE_FIELDS_CONFIG,
   mailchimpMemberEventsWatchPath: process.env.MAILCHIMP_MEMBER_EVENTS_WATCH_PATH,
   mailchimpMemberEvents: process.env.MAILCHIMP_MEMBER_EVENTS_CONFIG,
-  mailchimpRetryAttempts: process.env.MAILCHIMP_RETRY_ATTEMPTS
+  mailchimpRetryAttempts: process.env.MAILCHIMP_RETRY_ATTEMPTS,
 };