fixed git hooks

package.json

@@ -35,7 +35,7 @@
     "hooks": {
       "pre-commit": "lint-staged",
       "pre-push": "npm test",
-      "post-merge": "scripts/sync-npm-dependencies.sh",
+      "post-merge": "npm install",
       "post-checkout": "scripts/sync-npm-dependencies.sh"
     }
   },

scripts/sync-npm-dependencies.sh

@@ -1,8 +1,12 @@
 #!/bin/bash
 
 echo "checking package-lock.json for changes"
-if [ "$1" != "$2" ]; then
-  DIFF=$(git diff $1 $2 package-lock.json)
+IFS=' '
+read -ra G_PARAMS <<< "$HUSKY_GIT_PARAMS"
+PREV=${G_PARAMS[0]}
+NEXT=${G_PARAMS[1]}
+if [ "$PREV" != "$NEXT" ]; then
+  DIFF=$(git diff $PREV $NEXT package-lock.json)
   if [ "$DIFF" != "" ]; then
     npm install
   fi