chore: set up CircleCI

.circleci/config.yml

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+version: 2
+workflows:
+  version: 2
+  tests:
+    jobs: &workflow_jobs
+      - node6:
+          filters: &all_commits
+            tags:
+              only: /.*/
+      - node8:
+          filters: *all_commits
+      - node10:
+          filters: *all_commits
+      - lint:
+          filters: *all_commits
+      - publish_npm:
+          requires:
+            - node6
+            - node8
+            - node10
+          filters:
+            branches:
+              ignore: /.*/
+            tags:
+              only: '/^v[\d.]+$/'
+  nightly:
+    triggers:
+      - schedule:
+          cron: 0 7 * * *
+          filters:
+            branches:
+              only: master
+    jobs: *workflow_jobs
+jobs:
+  node6:
+    docker:
+      - image: 'node:6'
+        user: node
+    steps: &unit_tests_steps
+      - checkout
+      - run: &remove_package_lock
+          name: Remove package-lock.json if needed.
+          command: |
+            WORKFLOW_NAME=`python .circleci/get_workflow_name.py`
+            echo "Workflow name: $WORKFLOW_NAME"
+            if [ "$WORKFLOW_NAME" = "nightly" ]; then
+              echo "Nightly build detected, removing package-lock.json."
+              rm -f package-lock.json samples/package-lock.json
+            else
+              echo "Not a nightly build, skipping this step."
+            fi
+      - run: npm install
+      - run: npm test
+      - run: npm run codecov
+  node8:
+    docker:
+      - image: 'node:8'
+        user: node
+    steps: *unit_tests_steps
+  node10:
+    docker:
+      - image: 'node:10'
+        user: node
+    steps: *unit_tests_steps
+  lint:
+    docker:
+      - image: 'node:8'
+        user: node
+    steps:
+      - checkout
+      - run: *remove_package_lock
+      - run: npm install
+      - run: npm run check
+  publish_npm:
+    docker:
+      - image: 'node:8'
+        user: node
+    steps:
+      - checkout
+      - run: echo "//registry.npmjs.org/:_authToken=${NPM_TOKEN}" > ~/.npmrc
+      - run: npm install
+      - run: npm publish --access public

.circleci/get_workflow_name.py

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+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""
+Get workflow name for the current build using CircleCI API.
+Would be great if this information is available in one of
+CircleCI environment variables, but it's not there.
+https://circleci.ideas.aha.io/ideas/CCI-I-295
+"""
+
+import json
+import os
+import sys
+import urllib2
+
+
+def main():
+    try:
+        username = os.environ['CIRCLE_PROJECT_USERNAME']
+        reponame = os.environ['CIRCLE_PROJECT_REPONAME']
+        build_num = os.environ['CIRCLE_BUILD_NUM']
+    except:
+        sys.stderr.write(
+            'Looks like we are not inside CircleCI container. Exiting...\n')
+        return 1
+
+    try:
+        request = urllib2.Request(
+            "https://circleci.com/api/v1.1/project/github/%s/%s/%s" %
+            (username, reponame, build_num),
+            headers={"Accept": "application/json"})
+        contents = urllib2.urlopen(request).read()
+    except:
+        sys.stderr.write('Cannot query CircleCI API. Exiting...\n')
+        return 1
+
+    try:
+        build_info = json.loads(contents)
+    except:
+        sys.stderr.write(
+            'Cannot parse JSON received from CircleCI API. Exiting...\n')
+        return 1
+
+    try:
+        workflow_name = build_info['workflows']['workflow_name']
+    except:
+        sys.stderr.write(
+            'Cannot get workflow name from CircleCI build info. Exiting...\n')
+        return 1
+
+    print workflow_name
+    return 0
+
+
+retval = main()
+exit(retval)