Save CI-built node_modules as build artifacts (facebook#14205)

* Store node_modules generated by CI script as an artifact
* NPM pack artifacts before archiving

.circleci/config.yml

@@ -40,3 +40,6 @@ jobs:
           key: v1-node-{{ arch }}-{{ .Branch }}-{{ checksum "yarn.lock" }}
           paths:
             - node_modules
+
+      - store_artifacts:
+          path: ./node_modules.tgz

scripts/circleci/pack_and_store_artifact.sh

@@ -0,0 +1,11 @@
+#!/bin/bash
+
+set -e
+
+# NPM pack all modules to ensure we archive the correct set of files
+for dir in ./build/node_modules/* ; do
+  npm pack "$dir"
+done
+
+# Wrap everything in a single zip file for easy download by the publish script
+tar -zcvf ./node_modules.tgz ./*.tgz

scripts/circleci/test_entry_point.sh

@@ -30,6 +30,7 @@ if [ $((2 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then
   COMMANDS_TO_RUN+=('yarn test-build-prod --maxWorkers=2')
   COMMANDS_TO_RUN+=('node ./scripts/tasks/danger')
   COMMANDS_TO_RUN+=('./scripts/circleci/upload_build.sh')
+  COMMANDS_TO_RUN+=('./scripts/circleci/pack_and_store_artifact.sh')
 fi
 
 if [ $((3 % CIRCLE_NODE_TOTAL)) -eq "$CIRCLE_NODE_INDEX" ]; then