simpler approach

.circleci/config.yml

@@ -108,15 +108,8 @@ jobs:
       - run:
           name: Install deps via npm
           command: |
-            if [ ! -d node_modules ]; then
-              sudo npm install -g npm@6
-              npm install
-              # If the package-lock.json has changed, die with an error
-              CHANGED_FILES="$(git diff --name-only package-lock.json)"
-              echo "$CHANGED_FILES" | grep --quiet "package-lock.json" && 
-              echo "Looks like package-lock.json has changed. Did you forget to include it on your PR?" && 
-              exit
-            fi
+           sudo npm install -g npm@6
+           npm install
       - save_cache:
           key: dependency-cache-{{ checksum "package-lock.json" }}
           paths: