chore: install and configure commitlint

CONTRIBUTING.md

@@ -2,29 +2,33 @@
 
 ## Installation
 
-* `git clone <repository-url>`
-* `cd ember-autofocus-modifier`
-* `pnpm install`
+- `git clone <repository-url>`
+- `cd ember-autofocus-modifier`
+- `pnpm install`
+
+## Conventional Commits
+
+This repository enforces conventional commits through Git hooks and `commitlint`. Thus, your commits must follow the [Conventional Commits spec](https://www.conventionalcommits.org/en/v1.0.0/) and `@commitlint/config-conventional` [rules](https://github.com/conventional-changelog/commitlint/tree/master/%40commitlint/config-conventional#rules).
 
 ## Linting
 
-* `pnpm lint`
-* `pnpm lint:fix`
+- `pnpm lint`
+- `pnpm lint:fix`
 
 ## Building the addon
 
-* `cd ember-autofocus-modifier`
-* `pnpm build`
+- `cd ember-autofocus-modifier`
+- `pnpm build`
 
 ## Running tests
 
-* `cd test-app`
-* `pnpm test` – Runs the test suite on the current Ember version
+- `cd test-app`
+- `pnpm test` – Runs the test suite on the current Ember version
 
 ## Running the test application
 
-* `cd test-app`
-* `pnpm start`
-* Visit the test application at [http://localhost:4200](http://localhost:4200).
+- `cd test-app`
+- `pnpm start`
+- Visit the test application at [http://localhost:4200](http://localhost:4200).
 
 For more information on using ember-cli, visit [https://cli.emberjs.com/release/](https://cli.emberjs.com/release/).

commitlint.config.js

@@ -0,0 +1,9 @@
+"use strict";
+
+module.exports = {
+  extends: ["@commitlint/config-conventional"],
+  rules: {
+    "body-leading-blank": [2, "always"],
+    "footer-leading-blank": [2, "always"],
+  },
+};

lefthook.yml

@@ -0,0 +1,4 @@
+commit-msg:
+  commands:
+    commitlint:
+      run: pnpm commitlint --edit $1

package.json

@@ -14,15 +14,19 @@
     "lint:fix": "pnpm --filter '*' lint:fix",
     "lint:types": "pnpm --filter '*' lint:types",
     "prepare": "pnpm build",
+    "postinstall": "lefthook install",
     "start": "concurrently 'pnpm:start:*' --restart-after 5000 --prefix-colors cyan,white,yellow",
     "start:addon": "pnpm --filter ember-autofocus-modifier start",
     "start:test-app": "pnpm --filter test-app start",
     "test": "pnpm --filter '*' test"
   },
   "devDependencies": {
+    "@commitlint/cli": "^18.4.3",
+    "@commitlint/config-conventional": "^18.4.3",
     "@release-it-plugins/lerna-changelog": "^6.0.0",
     "@release-it-plugins/workspaces": "^4.0.0",
     "concurrently": "^8.2.1",
+    "lefthook": "^1.5.5",
     "prettier": "^3.0.3",
     "release-it": "^15.11.0"
   },