link-free/gatsby-config.js

const fs = require(`fs`)
const metadataFile = `./content/metadata.json`
const metadata = fs.existsSync(metadataFile) ? require(metadataFile) : ''

module.exports = {
  plugins: [
    {
      resolve: `@marscollective/gatsby-theme-link-free`,
      options: {
        metadata
      }
    }
  ]
}