add post-merge hook

husky.config.js

@@ -1,6 +1,7 @@
 module.exports = {
   hooks: {
     'pre-commit': 'lint-staged',
+    'post-merge': 'yarn postmerge',
   },
 };
 

package.json

@@ -30,7 +30,8 @@
   "scripts": {
     "test": "jest --config jest.config.js --colors",
     "test:dev": "cross-env BABEL_ENV=test jest --config jest.config.js --watch",
-    "changelog": "conventional-changelog  -i CHANGELOG.md -s"
+    "changelog": "conventional-changelog  -i CHANGELOG.md -s",
+    "postmerge": "sh post-merge.sh"
   },
   "dependencies": {
     "is-dom": "^1.0.9"

post-merge.sh

@@ -0,0 +1,15 @@
+#!/usr/bin/env bash
+# MIT © Sindre Sorhus - sindresorhus.com
+
+# git hook to run a command after `git pull` if a specified file was changed
+# Run `chmod +x post-merge` to make it executable then put it into `.git/hooks/`.
+
+changed_files="$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)"
+
+check_run() {
+	echo "$changed_files" | grep --quiet "$1" && eval "$2"
+}
+
+# Example usage
+# In this example it's used to run `npm install` if yarn.lock changed
+check_run yarn.lock "yarn"