chore(git): pre-commit hook to lint & fmt

Run `npm i` or `npm up` for this hook to start working.

.dockerignore

@@ -1,12 +1,13 @@
-.git
+.git/
 .gitignore
 .env
 .env.example
-.github
-.vscode
-.prettierrc
+.github/
+.vscode/
+.prettierrc.json
 .prettierignore
 .eslintrc.cjs
+.eslintcache
 
 node_modules/
 worker/

.eslintrc.cjs

@@ -7,6 +7,7 @@ module.exports = {
   },
 
   extends: [
+    // Google JS Style Guide Rules
     // See: https://github.com/google/eslint-config-google
     "google",
   ],
@@ -18,6 +19,9 @@ module.exports = {
 
   plugins: ["prettier"],
   rules: {
+    // Google JS rules, missing in "eslint-config-google" package
+    "eqeqeq": ["error", "smart"],
+
     // Rules disabled to avoid conflicts with prettier
     // See: https://github.com/prettier/eslint-config-prettier
     "indent": 0,
@@ -34,6 +38,6 @@ module.exports = {
     // Enforces rules from .prettierrc file.
     // These should be fixed automatically with formatting.
     // See: https://github.com/prettier/eslint-plugin-prettier
-    "prettier/prettier": "warn",
+    "prettier/prettier": "error",
   },
 };

.gitignore

@@ -2,11 +2,15 @@
 dist/
 node_modules/
 worker/
-test/data/cache
+test/data/cache/
+
 package-lock.json
 
 # IDE
 .vscode
 
 # Local enviroment variables
 .env
+
+# Cache
+.eslintcache

.husky/.gitignore

@@ -0,0 +1 @@
+_

.husky/pre-commit

@@ -0,0 +1,4 @@
+#!/bin/sh
+. "$(dirname "$0")/_/husky.sh"
+
+npx lint-staged

package.json

@@ -10,7 +10,8 @@
     "clean": "npm run clean:wrangler",
     "clean:node": "rm -rf node_modules/ package-lock.json",
     "clean:wrangler": "rm -rf worker/ dist/",
-    "test": "echo \"Error: no test specified\" && exit 1"
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "prepare": "husky install"
   },
   "repository": {
     "type": "git",
@@ -33,6 +34,12 @@
     "eslint": "^8.5.0",
     "eslint-config-google": "^0.14.0",
     "eslint-plugin-prettier": "^4.0.0",
+    "husky": "^7.0.4",
+    "lint-staged": "^12.1.4",
+    "prettier": "2.5.1",
     "webpack": "^5.65.0"
+  },
+  "lint-staged": {
+    "*.js": "eslint --cache --fix"
   }
 }