Skip writing lockfile hash in postinstall when installed as a dependency (#725)

Author: bedrich-schindler

scripts/write-lockfile-hash.sh

@@ -11,5 +11,11 @@ SCRIPT_DIR="$( cd "$( dirname "$0" )" && pwd )"
 # Change to the parent directory of the script
 cd "$SCRIPT_DIR/.."
 
+# Skip when running as an installed dependency,
+# the published package contains no package-lock.json.
+if [ ! -f package-lock.json ]; then
+  exit 0
+fi
+
 # Record the hash of the lockfile we just installed against
 sha256sum package-lock.json | awk '{print $1}' > "$LOCK_HASH_FILE"