chore: Create optional eslint pre-commit hook (#1472)

Co-authored-by: April Sylph <28949509+AprilSylph@users.noreply.github.com>

Author: marcustyphoon

.git-hooks/pre-commit

@@ -0,0 +1 @@
+npm run posttest -- --max-warnings=0

.gitignore

@@ -1,4 +1,5 @@
 .DS_Store
+.eslintcache
 .vscode/
 .web-extension-id
 **.less

docs/Chapter 2 - Getting started.md

@@ -13,6 +13,8 @@
 - **`npm test --ignore-scripts`**: Runs only the addon linter. Only reports syntax and WebExtension API errors.
 - **`npm run autofix`**: Automatically fixes any style errors.
 - **`npm run build`**: Creates an unsigned ZIP of the addon.
+- **`npm run enable-hooks`**: Enables a git hook that lints staged files locally before they are committed.
+- **`npm run disable-hooks`**: Disables git hooks.
 
 ### Web-only development
 

package.json

@@ -4,10 +4,12 @@
   "type": "module",
   "scripts": {
     "test": "web-ext lint",
-    "posttest": "eslint src/",
+    "posttest": "eslint src/ --cache",
     "autofix": "eslint src/ --fix",
     "start": "web-ext run",
-    "build": "web-ext build"
+    "build": "web-ext build",
+    "enable-hooks": "git config core.hooksPath .git-hooks",
+    "disable-hooks": "git config --unset core.hooksPath"
   },
   "devDependencies": {
     "chrome-webstore-upload-cli": "^3.5.0",