version: 2
jobs:
  build:
    docker:
      - image: circleci/node:12-stretch

    working_directory: ~/repo

    steps:
      - checkout
      - restore_cache:
          keys:
            - v1-dependencies-{{ checksum "package.json" }}
            # fallback to using the latest cache if no exact match is found
            - v1-dependencies-

      - run:
          name: Install NPM dependencies
          command: npm install

      - save_cache:
          paths:
            - node_modules
          key: v1-dependencies-{{ checksum "package.json" }}

      - run:
          name: Test syntax and perform type checking
          command: npm test

  deploy:
    requires:
      - build
    filters:
      tags:
        only: /^v.*/
    steps:
      - run:
          name: Authenticate with registry
          command: echo "//registry.npmjs.org/:_authToken=$NPM_TOKEN" > ~/repo/.npmrc
      - run:
          name: Deploy package
          command: npm run deploy