GraphQL Intl Directive

intl_directive.js

class IntlDirective extends SchemaDirectiveVisitor {
  visitFieldDefinition(field, details) {
    const fieldName = field.name; 
    field.resolve = async function (...args) {
      // get document, GraphQL arguments, and query context
      const [ doc, graphQLArguments, context ] = args;
      // get the locale either from the query's arguments, or from the context
      const locale = graphQLArguments.locale || context.locale;
      // get the field containing translations
      const intlField = doc[`${name}_intl`];
      // Return string in requested or default language, or else field's original value
      return intlField && getLocaleString(intlField, locale) || doc[fieldName];
    };
  }
}