Additional usage: flow style comment

Hey cool project! 😄

I was thinking another usage could be to have flow (// @flow) style comments at the start of a file to be ran through preval.

That way the consumer of a file would not need to annotate an import. Instead a module would have the scope defined to be pre-evaluated, without the need to explicitly import babel-plugin-preval.

Example:

foo.js

// @preval
const fs = require('fs');
module.exports = fs.readFileSync(require.resolve('./foo.txt'), 'utf8');

//      ↓ ↓ ↓ ↓ ↓ ↓
module.exports = "Hello world!"

bar.js

const foo = require('./foo');

console.log(foo); // Hello world!

[kentcdodds]

Supported!

[mattphillips]

Nice one lets see how I get on 😉