form_props.js

Form.getProps = form => Object.assign({},
   ...Object.entries(form)
   .filter(([formPropKey, formProp]) => formPropKey !== 'fields')
   .map(([formPropKey, formProp]) => ({
      [formPropKey]: formProp instanceof Function ? formProp(form) : formProp,
   })),
   {
      fields: Object.assign({}, ...Object.entries(form.fields).map(([fieldKey, field]) => ({
         [fieldKey]: Object.assign({}, ...Object.entries(field).map(([fieldPropKey, fieldProp]) => ({
            [fieldPropKey]: fieldProp instanceof Function ? fieldProp(form, fieldKey) : fieldProp,
         }))),
      }))),
   },
);