From af04ca59e9f24892f2e0cf1a783feedd9e88ad06 Mon Sep 17 00:00:00 2001
From: Bruno Barbieri <bruno.barbieri@consensys.net>
Date: Fri, 6 Jul 2018 15:26:06 -0400
Subject: Run npm install only when needed

---
 .circleci/config.yml | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index 63f6a64b1..e41b919fa 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -108,7 +108,10 @@ jobs:
       - run:
           name: Install deps via npm
           command: |
-           sudo npm install -g npm@6
+           # Only run npm install if the package-lock.json or package.json was changed
+           CHANGED_FILES="$(git diff-tree -r --name-only --no-commit-id ORIG_HEAD HEAD)"
+	         echo "$CHANGED_FILES" | grep --quiet "package.*json" && 
+           sudo npm install -g npm@6 &&
            npm install
       - save_cache:
           key: dependency-cache-{{ checksum "package-lock.json" }}
-- 
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