Sure. This isn't the first issue about support for flowtype. See: #306, #186, and #157

I've been wanting to expose the underlying eslint configurability via package.json and command line option so that we can put an end to all the requests to support X, Y, or Z JavaScript extension.

In the past, I've rejected such things on the basis that we want to avoid configurability in standard, since that's kinda the whole point.

But, users use JSX, Babel, React, Flow, and a bunch of other things. Rather than support them in standard core, I want to move to a model where standard continues to Just Work out of the box, but we expose the necessary hooks for adding support for whatever flavor of the week thing decides to extend the built-in JS syntax.

So, with all that said, here's a PR to add support to standard-engine for setting plugins: standard/standard-engine#56

Works in package.json:

{
  "standard": {
    "plugins": [ "my-plugin" ]
  }
}

Or via command line option:

standard --plugin my-plugin

This will be released in standard v6.