Release using script

.circleci/config.yml

@@ -1,31 +1,54 @@
 version: 2
 
-jobs:
-  verify:
-    docker:
-      - image: circleci/node:10
+defaults: &defaults
+  working_directory: ~/repo
+  docker:
+    - image: circleci/node:10
+
+_steps:
+  save_npm_cache: &save_npm_cache
+    save_cache:
+      paths:
+        - node_modules
+      key: v1-dependencies-{{ checksum "package.json" }}
 
-    working_directory: ~/repo
+  restore_npm_cache: &restore_npm_cache
+    restore_cache:
+      keys:
+        - v1-dependencies-{{ checksum "package.json" }}
+        # fallback to using the latest cache if no exact match is found
+        - v1-dependencies-
 
+jobs:
+  verify:
+    <<: *defaults
     steps:
       - checkout
-
-      - restore_cache:
-          keys:
-          - v1-dependencies-{{ checksum "package.json" }}
-          - v1-dependencies-
-
+      - *restore_npm_cache
       - run: yarn install
+      - *save_npm_cache
+      - run: if [ -z  "$NPM_TOKEN" ]; then exit 1; fi
+      - run: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/repo/.npmrc
+      - run: sh release.sh
 
-      - save_cache:
-          paths:
-            - node_modules
-          key: v1-dependencies-{{ checksum "package.json" }}
-
+  deploy:
+    <<: *defaults
+    steps:
+      - checkout
+      - *restore_npm_cache
+      - run: yarn install
+      - *save_npm_cache
       - run: yarn run ci
-      
+
 workflows:
   version: 2
   main_workflow:
     jobs:
       - verify
+      - deploy:
+          requires:
+            - verify
+          filters:
+            branches:
+              only:
+                - master

release.sh

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+version=$(cat package.json | jq -r .version)
+name=$(cat package.json | jq -r .name)
+
+publishedVersion=$(yarn info "$name" --json | jq -r .data.\"dist-tags\".latest)
+
+if [ "$version" = "$publishedVersion" ]; then
+    echo "Newest version is already deployed."
+    exit 0
+fi
+
+echo "Deploying version $version."
+
+npm publish