Codecov setup

.travis.yml

---
language: node_js
node_js:
  - 9
  - 10
script:
  # use latest npm to work on node9
  - npm install -g npm
  # codecov
  - npm install -g codecov
  # initialization & testing
  - npm run bootstrap && npm test
after_success:
  # code coverage & codecov upload
  - rm -Rf .nyc_output && mkdir -p .nyc_output
  - find packages/**/.nyc_output -type f -name '*.json' -exec cp '{}' .nyc_output \;
  - npx nyc report --reporter=text-lcov > .nyc_output/coverage.lcov
  - codecov

packages-mypackage-package.json

{
  "name": "mypackage",
  "version": "0.0.0",
  "description": "",
  "main": "./dist/index.js",
  "types": "./dist/index.d.ts",
  "scripts": {
    "test": "hayspec test --require ts-node/register --match './src/tests/**/*.test.ts'"
  },
  "nyc": {
    "extension": [
      ".ts"
    ],
    "require": [
      "ts-node/register"
    ],
    "exclude": [
      "src/tests"
    ]
  },
  "license": "MIT",
  "devDependencies": {
    "@hayspec/cli": "latest",
    "@hayspec/spec": "latest",
    "nyc": "^12.0.2",
    "typescript": "^3.1.1"
  }
}