"scripts": {
    "build": "tsc src/index.ts",
    "dev": "tsc src/index.ts --watch",
    "test": "qunit --require ts-node/register --watch 'test/**/*-test.ts'"
  }

Easy to run typescript tests, and pretty well documented. However --watch only reruns tests when .js files change. It ignores .tsfiles.

Suggestion: watch should trigger on both ts and js files.