From 8fbcf3e63c966b2a12a4e98da7b3dde27f06b057 Mon Sep 17 00:00:00 2001
From: Noah Chen <noahchen@gmail.com>
Date: Fri, 20 Jan 2017 20:41:23 -0500
Subject: [PATCH] Fail tests if CIRCLE_NODE_TOTAL is < 4 (#2084)

---
 circle.yml                      | 1 +
 scripts/assertMinCircleNodes.js | 8 ++++++++
 2 files changed, 9 insertions(+)
 create mode 100644 scripts/assertMinCircleNodes.js

diff --git a/circle.yml b/circle.yml
index 4b2d8cf7528..358b6f4aff7 100644
--- a/circle.yml
+++ b/circle.yml
@@ -4,6 +4,7 @@ general:
       - gh-pages
 dependencies:
   pre:
+    - node ./scripts/assertMinCircleNodes.js $CIRCLE_NODE_TOTAL
     - case $CIRCLE_NODE_INDEX in 0) nvm use 4.2 ;; 1) nvm use 5.7 ;; [2-3]) nvm use 6.1 ;; esac
 test:
   override:
diff --git a/scripts/assertMinCircleNodes.js b/scripts/assertMinCircleNodes.js
new file mode 100644
index 00000000000..449864e72e7
--- /dev/null
+++ b/scripts/assertMinCircleNodes.js
@@ -0,0 +1,8 @@
+var requiredNodes = 4;
+var nodes = parseInt(process.argv[2], 10);
+if (requiredNodes != null && requiredNodes > nodes) {
+    console.error("ERROR: You must run CircleCI with 4 parallel nodes");
+    console.error("    This ensures that different environments are tested for TSLint compatibility");
+    console.error("    https://circleci.com/gh/<YOUR ACCOUNT>/tslint/edit#parallel-builds");
+    process.exit(1);
+}