Add basic CircleCI config

.circleci/config.yml

@@ -0,0 +1,66 @@
+version: 2.1
+
+workflows:
+  lint:
+    jobs:
+      - prep-deps
+      - test-lint:
+          requires:
+            - prep-deps
+      - test-unit:
+          requires:
+            - prep-deps
+      - all-tests-pass:
+          requires:
+            - test-lint
+            - test-unit
+
+jobs:
+  prep-deps:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - checkout
+      - run:
+          name: Install deps
+          command: |
+            .circleci/scripts/deps-install.sh
+      - run:
+          name: Collect yarn install HAR logs
+          command: |
+            .circleci/scripts/collect-har-artifact.sh
+      - persist_to_workspace:
+          root: .
+          paths:
+          - node_modules
+          - build-artifacts
+
+  test-lint:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - checkout
+      - attach_workspace:
+          at: .
+      - run:
+          name: Lint
+          command: yarn lint
+
+  test-unit:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - checkout
+      - attach_workspace:
+          at: .
+      - run:
+          name: Unit tests
+          command: yarn test
+
+  all-tests-pass:
+    docker:
+      - image: circleci/node:10
+    steps:
+      - run:
+          name: All tests passed
+          command: echo 'Great success'

.circleci/scripts/collect-har-artifact.sh

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+#!/usr/bin/env bash
+
+set -x
+set -e
+set -u
+set -o pipefail
+
+mkdir -p build-artifacts/yarn-install-har
+mv ./*.har build-artifacts/yarn-install-har/

.circleci/scripts/deps-install.sh

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+#!/usr/bin/env bash
+
+set -x
+set -e
+set -u
+set -o pipefail
+
+yarn --frozen-lockfile --ignore-scripts --har