Precommit hook for git lfs. Fix #2506

build/check-lfs.js

@@ -0,0 +1,10 @@
+const $ = require('shelljs')
+
+const { code, stdout } = $.exec('git lfs --version', { silent: true })
+
+if (code === 0 && stdout.startsWith('git-lfs')) {
+  process.exit(0)
+} else {
+  console.log('Please install Git LFS https://github.com/microsoft/vscode-docs#cloning for commiting {gif,mp4,jpg,png} files.')
+  process.exit(1)
+}

package.json

@@ -8,8 +8,23 @@
     "type": "git",
     "url": "https://github.com/Microsoft/vscode-docs.git"
   },
+  "scripts": {
+    "check-lfs": "node ./build/check-lfs.js"
+  },
   "devDependencies": {
     "gulp": "^3.9.1",
+    "husky": "^1.3.1",
+    "lint-staged": "^8.1.5",
     "shelljs": "^0.7.8"
+  },
+  "husky": {
+    "hooks": {
+      "pre-commit": "lint-staged"
+    }
+  },
+  "lint-staged": {
+    "*.{gif,mp4,jpg,png}": [
+      "git lfs --version"
+    ]
   }
 }