Custom Scalars

Configuring your runtime to handle custom scalars is done under the scalars key in your config:

houdini.config.js

export default {
  // ...
  scalars: {
    // the name of the scalar we are configuring
    DateTime: {
      // the corresponding typescript type
      type: 'Date',
      // turn the api's response into that type
      unmarshal(val) {
        return val ? new Date(val) : null
      },
      // turn the value into something the API can use
      marshal(date) {
        return date && date.getTime()
      }
    }
  }
}

Please note that your marshal/unmarshal functions are also called with null values, and these must be handled appropriately.