title: Is there a way to tell flow to typecheck every file, not just the ones with /* flow */?
body: <p>In the official examples they always have <code>/* @flow */</code> at the top of the page. Now that's nice and helpful for an existing project, where I want to opt-in to flow for each file. Building a new project from scratch I would like to just have flow type checking everywhere, without having to type <code>/* @flow */</code> every time. Is it possible?</p>