Check that all files match prettier code style.

$ npm install --save-dev prettier prettier-check

Make sure you have prettier as a dependency (or globally).

Use it in the test script in your package.json:

  "scripts": {
    "test": "prettier-check src/**/*.js"
  },

All args are forwarded to prettier:

  "scripts": {
    "test": "prettier-check --single-quote --trailing-comma es5 src/**/*.js"
  },

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